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Next: S2880 (2xOpteron) doesn't start with Adaptec 2120..
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External
Since: Jul 25, 2003
Posts: 2
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(Msg. 1) Posted: Fri Jul 25, 2003 9:34 am
Post subject: ATX connector welded to Tyan Tiger MP S2460; can it happen again?
Archived from groups: alt>comp>periphs>mainboard>tyan (more info?)
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This was the machine as it was:
- Tiger MP S2460
- 2x Athlon MP 1600+
- 2x PC Power and Cooling CPU Cool AG heatsink/fan
- 2x Kingston 256MB PC2100 registered SDRAM
- ATI Radeon 8500 (+ fan)
- SigmaDesigns Hollywood Plus MPEG decoder
- SBLive! Value sound card
- Netgear FA-311 NIC
- Antec PP-303X 300W PSU (30A on +5v)
- 2x 80mm fans which drew from motherboard fan power connectors
- 2x 80mm fans which drew from PSU drive power connectors
- Raite RDR-108H DVD-ROM
- IBM Deskstar 60GB 7200 RPM
- Western Digital Caviar 30GB (may not have been plugged in?)
- 3.5" floppy drive from before the dawn of time, or something
The machine (assembled Jan/Feb 2002) worked great until recently.
That's when it started spazzing on me, crashing more and more
frequently. These crashes usually came with "random" video artifacts
(reminiscent of what happens to an Atari 2600 when it loses contact
with the cartridge). It even crashed once while in the BIOS (text
artifacts there). I eventually pulled all the hardware but the
essentials (CPU, RAM, board, video), but it was gone -- it would power
up, but I'd either get a very short uptime or no POST at all.
I tried swapping video cards, but no go. I don't carry spare MP
hardware, so I made an educated guess that the motherboard (and not
the CPUs or RAM) was the culprit. It looks like I was right.
I do development on this machine and needed it back ASAP, so I bought
a Tiger MPX S2462 (AFAIK this is essentially a new revision of the
board I had). In dismantling the old setup, I found that *three* of
the +5v leads on the ATX connector had welded themselves to the
motherboard (I would've hoped that the fuse would blow before this, or
at least that the connector would also be capable of taking the
juice). Funny thing is, the PSU itself seems fine, aside from the
charred 20-pin connector which we had to pry off the board. Still, I
bought a new 400W PSU.
(If it's relevant, I originally had a [probably no-name] 400W PSU in
this machine. It went up in smoke [literally!] a few months after I
bought it; I just pulled the Antec from another box and went on with
life, not at all thinking that maybe it was part of something larger.
Then again, maybe it wasn't.)
Right now, I've got the new board and PSU plus the old video, sound,
keyboard and mouse, and it's working great. My concern now is whether
this might happen again -- if the culprit *was* something beyond the
other board, it may trash this one as well, but I can't find anything.
My dad and I went at the board with a multimeter but didn't find
anything suspicious ourselves, and none of the other components in the
machine appear blackened or anything which one would normally
associate with an unusual overdraw of current.
My cursory research on Google/Usenet hints that maybe one of the VRMs
on the board failed. I know that one was running much hotter than the
other, though I've also read that this may be a byproduct of its
unfortunate location on the board. I also just noticed that the same
is true of this new board (it's at 54C -- that seems a tad too warm
[am I supposed to add cooling to that or something?]).
Also, should I bother trying to RMA the old board? (Not that I could
do much with the replacement except to have a spare on hand...)
Any input on the subject would be appreciated; if further details
would be helpful, feel free to ask and I'll try to provide what I can.
Thanks!
- Shane |
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External
Since: Jul 07, 2003
Posts: 3
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(Msg. 2) Posted: Fri Jul 25, 2003 2:28 pm
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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External
Since: Nov 07, 2003
Posts: 2186
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(Msg. 3) Posted: Fri Jul 25, 2003 5:07 pm
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Previously Shane Beasley <sbeasley.DeleteThis@cs.uic.edu> wrote:
[...]
> a Tiger MPX S2462 (AFAIK this is essentially a new revision of the
> board I had). In dismantling the old setup, I found that *three* of
> the +5v leads on the ATX connector had welded themselves to the
> motherboard (I would've hoped that the fuse would blow before this, or
> at least that the connector would also be capable of taking the
> juice). Funny thing is, the PSU itself seems fine, aside from the
> charred 20-pin connector which we had to pry off the board. Still, I
> bought a new 400W PSU.
Actually that is not how it works. The connectors will only get hot
when they have a hig restistance, i.e. a bad contact. This will
leave the PSU completely unconcerned but it will
a) heat up the connector, to the point of it melting down in extreme
cases (actually it starts to melt, but at this point the contact
becomes a lot better so it cools down again).
b) Cause the voltage deliverd to the mainboard to be lowerd.
However the mainboard will not draw much more current than
before, so no "fuses have a reason to blow", unless it is termal
fuses close to the connector.
One possibility is that the connector was not fully insterted. Another
is that it was partially corroded, possibly after it was installed.
Close to salt water?
Regards,
Arno
--
For email address: lastname AT tik DOT ee DOT ethz DOT ch
GnuPG: ID:1E25338F FP:0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F
"The more corrupt the state, the more numerous the laws" - Tacitus<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Jul 25, 2003
Posts: 2
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(Msg. 4) Posted: Fri Jul 25, 2003 5:07 pm
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Arno Wagner <me.TakeThisOut@privacy.net> wrote in message news:<bfrdj3$i95mr$1@ID-2964.news.uni-berlin.de>...
> Actually that is not how it works. The connectors will only get hot
> when they have a hig restistance, i.e. a bad contact. This will
> leave the PSU completely unconcerned but it will
>
> a) heat up the connector, to the point of it melting down in extreme
> cases (actually it starts to melt, but at this point the contact
> becomes a lot better so it cools down again).
>
> b) Cause the voltage deliverd to the mainboard to be lowerd.
>
> However the mainboard will not draw much more current than
> before, so no "fuses have a reason to blow", unless it is termal
> fuses close to the connector.
Interesting... That seems to explain everything. I'll go with it.
> One possibility is that the connector was not fully insterted.
It's been connected for months on end, apparently with no problem. For
it to lose contact after all that time seems weird, or so I'd think. I
do know that the connector itself was in all the way (both ends were
flush) when I found it melted, which made it difficult to get leverage
to pry the thing off.
> Another is that it was partially corroded, possibly after it was
> installed. Close to salt water?
Couldn't be further (Chicago, Illinois, USA, nearly halfway between
the East and West coasts and closer to Canada than Mexico), nor can I
imagine anything else in the vicinity that could be responsible (and
I'm trying).
Anyway, thanks for the enlightenment about the connection. I'll keep
it in mind in future ponderings.
- Shane<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Jun 29, 2003
Posts: 16
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(Msg. 5) Posted: Sat Jul 26, 2003 9:44 am
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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There's a (long) thread all about this problem here at 2 CPU
<a style='text-decoration: underline;' href="http://forums.2cpu.com/showthread.php?s=127f61b1142c9f8daa4a308ada5e96e5&threadid=13703" target="_blank">http://forums.2cpu.com/showthread.php?s=127f61b1142c9f8daa4a308ada5e96...threadi</a>
(if link doesn't work just search the forums for - melted ATX Connector and
that will bring it up). Certain PSUs such as Enhance brand or the higher
wattage (550 Watt) Enermax appear to be less prone to this problem. Perhaps
its because they have connectors with a higher clamping force in their
plugs. I had this problem with my S2460 and a 431 Watt Enermax, since
changing the PSU to the 460 Watt Enhance (with a replacement motherboard)
the problem has not reoccurred (and its been working for far longer than
with the Enermax).
Paul
"Shane Beasley" <sbeasley.DeleteThis@cs.uic.edu> wrote in message
news:2f2d78e1.0307251246.408fbabb@posting.google.com...
> Arno Wagner <me.DeleteThis@privacy.net> wrote in message
news:<bfrdj3$i95mr$1@ID-2964.news.uni-berlin.de>...
>
> > Actually that is not how it works. The connectors will only get hot
> > when they have a hig restistance, i.e. a bad contact. This will
> > leave the PSU completely unconcerned but it will
> >
> > a) heat up the connector, to the point of it melting down in extreme
> > cases (actually it starts to melt, but at this point the contact
> > becomes a lot better so it cools down again).
> >
> > b) Cause the voltage deliverd to the mainboard to be lowerd.
> >
> > However the mainboard will not draw much more current than
> > before, so no "fuses have a reason to blow", unless it is termal
> > fuses close to the connector.
>
> Interesting... That seems to explain everything. I'll go with it.
>
> > One possibility is that the connector was not fully insterted.
>
> It's been connected for months on end, apparently with no problem. For
> it to lose contact after all that time seems weird, or so I'd think. I
> do know that the connector itself was in all the way (both ends were
> flush) when I found it melted, which made it difficult to get leverage
> to pry the thing off.
>
> > Another is that it was partially corroded, possibly after it was
> > installed. Close to salt water?
>
> Couldn't be further (Chicago, Illinois, USA, nearly halfway between
> the East and West coasts and closer to Canada than Mexico), nor can I
> imagine anything else in the vicinity that could be responsible (and
> I'm trying).
>
> Anyway, thanks for the enlightenment about the connection. I'll keep
> it in mind in future ponderings.
>
> - Shane<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Jun 29, 2003
Posts: 16
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(Msg. 6) Posted: Sat Jul 26, 2003 9:44 am
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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There's a (long) thread all about this problem here at 2 CPU
<a style='text-decoration: underline;' href="http://forums.2cpu.com/showthread.php?s=127f61b1142c9f8daa4a308ada5e96e5&threadid=13703" target="_blank">http://forums.2cpu.com/showthread.php?s=127f61b1142c9f8daa4a308ada5e96...threadi</a>
(if link doesn't work just search the forums for - melted ATX Connector and
that will bring it up). Certain PSUs such as Enhance brand or the higher
wattage (550 Watt) Enermax appear to be less prone to this problem. Perhaps
its because they have connectors with a higher clamping force in their
plugs. I had this problem with my S2460 and a 431 Watt Enermax, since
changing the PSU to the 460 Watt Enhance (with a replacement motherboard)
the problem has not reoccurred (and its been working for far longer than
with the Enermax).
Paul
"Shane Beasley" <sbeasley.RemoveThis@cs.uic.edu> wrote in message
news:2f2d78e1.0307251246.408fbabb@posting.google.com...
> Arno Wagner <me.RemoveThis@privacy.net> wrote in message
news:<bfrdj3$i95mr$1@ID-2964.news.uni-berlin.de>...
>
> > Actually that is not how it works. The connectors will only get hot
> > when they have a hig restistance, i.e. a bad contact. This will
> > leave the PSU completely unconcerned but it will
> >
> > a) heat up the connector, to the point of it melting down in extreme
> > cases (actually it starts to melt, but at this point the contact
> > becomes a lot better so it cools down again).
> >
> > b) Cause the voltage deliverd to the mainboard to be lowerd.
> >
> > However the mainboard will not draw much more current than
> > before, so no "fuses have a reason to blow", unless it is termal
> > fuses close to the connector.
>
> Interesting... That seems to explain everything. I'll go with it.
>
> > One possibility is that the connector was not fully insterted.
>
> It's been connected for months on end, apparently with no problem. For
> it to lose contact after all that time seems weird, or so I'd think. I
> do know that the connector itself was in all the way (both ends were
> flush) when I found it melted, which made it difficult to get leverage
> to pry the thing off.
>
> > Another is that it was partially corroded, possibly after it was
> > installed. Close to salt water?
>
> Couldn't be further (Chicago, Illinois, USA, nearly halfway between
> the East and West coasts and closer to Canada than Mexico), nor can I
> imagine anything else in the vicinity that could be responsible (and
> I'm trying).
>
> Anyway, thanks for the enlightenment about the connection. I'll keep
> it in mind in future ponderings.
>
> - Shane<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Jul 20, 2003
Posts: 8
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(Msg. 7) Posted: Sat Jul 26, 2003 10:32 am
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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In article <bft4a9$6q6$1@news8.svr.pol.co.uk>,
Paul Murphy <p_murphynothankstospam.RemoveThis@hotmail.com> wrote:
>There's a (long) thread all about this problem here at 2 CPU
>http://forums.2cpu.com/showthread.php?s=127f61b1142c9f8daa4a308ada5e96e5&threadid=13703
I had the enermax431 and it was surviving for a while, however my
motherboard now wont boot, Fortunatley my connecters weren't smoked,
luckily i grabed a 2460 off ebay for cheap and it's working great with my
new (non enermax) 450 power sup, and i have even COOLER temperatures,i
can't even believe it they are 43 and 45 CPU1+2 that is ridiculous for summer
i average in themid 50s, the ebay 2460 did have an extra fan on the
northbridge, maybe that is doing it, well i don't care it's cool.<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Jan 11, 2004
Posts: 3
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(Msg. 8) Posted: Sun Jul 27, 2003 1:38 am
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Paul Murphy" <p_murphynothankstospam.DeleteThis@hotmail.com> wrote:
> There's a (long) thread all about this problem here at 2 CPU
HERE'S THE FIX !!!
These are some web pages that show how to add extra conductors to
prevent the notorious "Tyan s2460 ATX Connector Melt-Down":
<a style='text-decoration: underline;' href="http://students.washington.edu/vladis/atx_burn/" target="_blank">http://students.washington.edu/vladis/atx_burn/</a>
<a style='text-decoration: underline;' href="http://forums.2cpu.com/showthread.php?s=&threadid=28746" target="_blank">http://forums.2cpu.com/showthread.php?s=&threadid=28746</a><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Jun 29, 2003
Posts: 16
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(Msg. 9) Posted: Sun Jul 27, 2003 2:03 pm
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Tech God" <rodeo_racer.RemoveThis@netzero.com> wrote in message
news:e1d64fcb.0307262138.2b10ad80@posting.google.com...
> "Paul Murphy" <p_murphynothankstospam.RemoveThis@hotmail.com> wrote:
>
> > There's a (long) thread all about this problem here at 2 CPU
>
>
> HERE'S THE FIX !!!
>
> These are some web pages that show how to add extra conductors to
> prevent the notorious "Tyan s2460 ATX Connector Melt-Down":
>
<font color=purple> > <a style='text-decoration: underline;' href="http://students.washington.edu/vladis/atx_burn/</font" target="_blank">http://students.washington.edu/vladis/atx_burn/</font</a>>
>
<font color=purple> > <a style='text-decoration: underline;' href="http://forums.2cpu.com/showthread.php?s=&threadid=28746</font" target="_blank">http://forums.2cpu.com/showthread.php?s=&threadid=28746</font</a>>
Not the official fix though.
Tyan have developed a Y splitter cable which they are providing with some
(all?) RMA'd S2460s. They have also replaced the originally specified ATX
connector on the motherboard with a newer higher spec design ATX connector
(which looks the same as the old one). These new connectors are capable of 9
A per pin and with the assitance of the Y cable, those PSUs which only have
ATX connectors capable of 6 A per pin, can use one HDD connector in
conjunction with the motherboard connector to provide all the current
required without a meltdown. I found this out through a phone converstaion
with a Tyan Tech. The other "fix" is just to use a PSU with excellent
quality connectors in the first place.
My concern with doing a "home" fix is it will void your warranty for any
future problems.
Paul<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Nov 07, 2003
Posts: 2186
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(Msg. 10) Posted: Mon Jul 28, 2003 9:14 pm
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Previously Free Spirit <Burn.DeleteThis@d.man> wrote:
> On the S2462, the CPU's run off the 12V supply , the 5V supply should
> have relativly little load on it.
But the problem could be transferred to the 12V lines...
Actually it is not quite that simple. Since the VRMs for the
CPUs are switching mode, they basically do not draw a current
but a power (in a certain voltage window). That means at 12V
they draw roughly 42% of the current they draw at 5V input.
However there is only one +12V in the ATX connector, while there
are four +5V lines! That means the single 12V line gets to
carry 166% of the current, and consequentially gets 275% of
the power drop that was enough to melt the 5V lines! (Power
goes with the square of the current in a resistor.)
That is why e.g. the Tiger MPX absolutely requires a conventional
plug with no other load to be connected to the mainboard. This still
gives 80% current, equal to 64% of the "melting load"! Better, and
im my opinion the only good solution, is the additional +12V
connector that has two additional +12V lines, finally bringing the
current per line down to 55% and the power drop to 30% of
the melting load. Of course this is a very rough estimation.
They should have left the 3.3V lines completely out of the ATX
connector and instead have put in three additional +12V lines....
I hope that sheds a little light on the background of things.
Regards,
Arno
--
For email address: lastname AT tik DOT ee DOT ethz DOT ch
GnuPG: ID:1E25338F FP:0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F
"The more corrupt the state, the more numerous the laws" - Tacitus<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Jun 29, 2003
Posts: 16
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(Msg. 11) Posted: Tue Jul 29, 2003 12:00 am
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Arno Wagner" <me.DeleteThis@privacy.net> wrote in message
news:bg3p6j$j4sbp$1@ID-2964.news.uni-berlin.de...
> Previously Free Spirit <Burn.DeleteThis@d.man> wrote:
> > On the S2462, the CPU's run off the 12V supply , the 5V supply should
> > have relativly little load on it.
>
> But the problem could be transferred to the 12V lines...
>
> Actually it is not quite that simple......
<snip>
> Regards,
> Arno
>
> --
> For email address: lastname AT tik DOT ee DOT ethz DOT ch
> GnuPG: ID:1E25338F FP:0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F
> "The more corrupt the state, the more numerous the laws" - Tacitus
Thanks for that excellent explanation of what's going on there. Is there any
reason why the 3.3 Volt Bus couldn't be utilised to power the CPUs as well
as the +5 Volt rail (shared somehow)?
Love the sig - I have an improvement to it - wonder if it applies "The more
corrupt the state, the more numerous the lawyers" - Murphy 
Paul<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Nov 07, 2003
Posts: 2186
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(Msg. 12) Posted: Tue Jul 29, 2003 1:01 am
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Previously Paul Murphy <p_murphynothankstospam.RemoveThis@hotmail.com> wrote:
> "Arno Wagner" <me.RemoveThis@privacy.net> wrote in message
> news:bg3p6j$j4sbp$1@ID-2964.news.uni-berlin.de...
[...]
> Thanks for that excellent explanation of what's going on there. Is
> there any reason why the 3.3 Volt Bus couldn't be utilised to power
> the CPUs as well as the +5 Volt rail (shared somehow)?
With 3.3V only you have even higher current and filtering the input
becomes difficult. In addition many PSU deliver less or the same curent
on 3.3V as they do on 5V, i.e. 3.3V has only 66% of the power 5V
can deliver.
As to shared, that would be possible. However it would be expensive,
because it would basically require a 3-phase or 4-phase swithcher
that could deal with 2 different input voltages. While feasible,
this is a significantly harder design. One big problem with
switchers is stability. In this case you would have two different
power sources with different dynamic capabilities, making things
massively more unstable. And in addition, the input filters for
3.3V are even moer expensive than those for 5V, since they need
to deal with a higher current. Prpbably even more so for a mixed-
input design. That is one other reason why using 12V and an
additional 12V connector makes very much sense. The higher the
voltage, the cheaper the input filters.
> Love the sig -
Thanks.
> I have an improvement to it - wonder if it applies "The more
> corrupt the state, the more numerous the lawyers" - Murphy
That is probably the modern version.
Arno
--
For email address: lastname AT tik DOT ee DOT ethz DOT ch
GnuPG: ID:1E25338F FP:0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F
"The more corrupt the state, the more numerous the laws" - Tacitus<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: May 05, 2004
Posts: 92
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(Msg. 13) Posted: Tue Jul 29, 2003 7:28 pm
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Paul Murphy" <p_murphynothankstospam DeleteThis @hotmail.com> wrote in message
news:bg3v7f$at5$1@newsg1.svr.pol.co.uk...
> Thanks for that excellent explanation of what's going on there. Is there
any
> reason why the 3.3 Volt Bus couldn't be utilised to power the CPUs as well
> as the +5 Volt rail (shared somehow)?
It wouldn't help very much. You need either something with higher
voltage capacity of higher current capacity. The 3.3V doesn't really have
much of either. The right way to do it is to power the VRMs off the 12V
lines from the 12V connector.
DS<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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External
Since: Nov 07, 2003
Posts: 2186
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(Msg. 14) Posted: Wed Jul 30, 2003 5:04 am
Post subject: Re: ATX connector welded to Tyan Tiger MP S2460; can it happen again? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Previously David Schwartz <davids DeleteThis @webmaster.com> wrote:
> "Paul Murphy" <p_murphynothankstospam DeleteThis @hotmail.com> wrote in message
> news:bg3v7f$at5$1@newsg1.svr.pol.co.uk...
>> Thanks for that excellent explanation of what's going on there. Is there
> any
>> reason why the 3.3 Volt Bus couldn't be utilised to power the CPUs as well
>> as the +5 Volt rail (shared somehow)?
> It wouldn't help very much. You need either something with higher
> voltage capacity of higher current capacity. The 3.3V doesn't really have
> much of either. The right way to do it is to power the VRMs off the 12V
> lines from the 12V connector.
One option I did not think of would be to power one CPU from 5V and
one from 3.3V or 12V. This would solve the connector problem.
However it would make the design "asymmetric" and cause twice
the effort to work out the VRM bugs.
Arno
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"The more corrupt the state, the more numerous the laws" - Tacitus<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: ATX connector welded to Tyan Tiger MP S2460; can it happen.. |
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