P4DC6+ Max CPU Speed

Luigi <Luigi RemoveThis @Pizza.com> wrote in message news:<MPG.1a88a7d3d3da914798968e RemoveThis @newsgroups.bellsouth.net>...
 > In article <bvl8ie$31i$1@hfc.pacific.net.hk>, rollyandsam RemoveThis @hotmail.com
 > says...
  > > Has anyone tried a 603pin XEON greater than 2.4GHz on this motherboard?
  > > I'm looking at upgrading my processors and all I can find is that Supermicro
  > > says 2.4 is all they have tested to therefore can't give a reliable answer
  > > as to whether the newer 2.6 upwards 400MHz FSB XEON CPU's will work.
  > >
  > >
  > >
 >
 > I know this doesn't completely answer your question, but the BIOS only
 > allows bus multipliers up to 24x - in other words 2.4 Ghz. So even if
 > you were able to drop faster processor(s) in, I don't think you could
 > get the clock to run them > 2.4Ghz.
 >
 > Regards,
 > Luigi



The P4DCE+, P6DCE+, P4DCE+II, and the P6DCE+II all share the same
bios. (DC6P6273) The latest version is up to Rev. 1.3 on this page
-->>

<a style='text-decoration: underline;' href="http://www.supermicro.com/TECHSUPPORT/BIOS/bios.htm" target="_blank">http://www.supermicro.com/TECHSUPPORT/BIOS/bios.htm</a>

The "II" boards apparently received higher performing VRM's than did
the non-"II" boards. The only visable difference in the non-"II" and
the "II" boards is a heatsink Supermicro has installed on top of the
VRM's at the lower right corner of the board.

<a style='text-decoration: underline;' href="http://www.supermicro.com/Product_page/MB-Pics/860/P4DC6+-lg.jpg" target="_blank">http://www.supermicro.com/Product_page/MB-Pics/860/P4DC6+-lg.jpg</a>

and

<a style='text-decoration: underline;' href="http://www.supermicro.com/Product_page/MB-Pics/860/P4DC6+II-lg.jpg" target="_blank">http://www.supermicro.com/Product_page/MB-Pics/860/P4DC6+II-lg.jpg</a>

I guess my answer isn't reliable though, because I havent tried it
myself. All I can suggest is that you look at Intel's sSpec numbers
for the 603pin processors. ----->>
<a style='text-decoration: underline;' href="http://processorfinder.intel.com/scripts/list.asp?ProcFam=528&CorSpd=ALL&SysBusSpd=ALL&PkgType=ALL" target="_blank">http://processorfinder.intel.com/scripts/list.asp?ProcFam=528&CorSpd=A...SysBusS</a>

The 2.6, 2.8GHz processors both run at 1.5v like the 2.4Ghz does. The
3.0 is bumped up to 1.525v The main differences is the "Thermal
Guideline". Now if we assume since all the processors are based on the
same core, and resistance of each should be fairly constant. The
current must be the issue here.

If you use the table found here --->>
<a style='text-decoration: underline;' href="http://www.crownaudio.com/apps_htm/cts_design/ohms-law.htm" target="_blank">http://www.crownaudio.com/apps_htm/cts_design/ohms-law.htm</a>

Put in the info you do know such as watts, and volts, the current
levels start climbing quickly.

2.4Ghz / SL6YV / D1 / 1.5v / 65.0w / 43.33 amps

2.6GHz / SL6YW / D1 / 1.5v / 71.0w / 47.33 amps

2.8GHz / SL6YX / D1 / 4.5v / 74.0w / 49.33 amps

3.0GHz / SL6YY / D1 / 1.525v / 85.0w / 55.737 amps

I don't know why if the "II" boards are backward compatible the
Supermicro would continue to manufacture non-"II" boards. Here is a
Q&A from the Jan 2003 FAQ at SM's site. ----->>

<a style='text-decoration: underline;' href="http://www.supermicro.com/TECHSUPPORT/MonthlyFAQ/MB/mbfaq0103.htm" target="_blank">http://www.supermicro.com/TECHSUPPORT/MonthlyFAQ/MB/mbfaq0103.htm</a>

"Q: I am interested in your P4DC6+ motherboard since it uses RDRAM,
but I noticed that the motherboard seems to be limited to 2.4GHz. Has
the board not been validated to run faster processors?

A: The P4DCE+ and P4DC6+ are limited to 2.4GHz and slower Xeon
processors. We see such a demand for this motherboard and have
redesigned the CPU current capabilities and made two new motherboards
called P4DCE+II and P4DC6+II to support the faster processors."

If the VRM's are stable with a heatsink installed at lets say +/- 10%,
I wouls think you would be able to run 2.6 chips easily, and maybe
2.8's. The 3.0GHz would be way to hot.

Bob<!-- ~MESSAGE_AFTER~ -->
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