Asus Striker Extreme - QX6850 - Overclocking options

Hi

Asus Striker Extreme Bios 1305
Intel Conroe QX6850 3Ghz
4gb Corsair XMS2 DDRII 800 - PC 6400 C5DHX (being recognised as 2.5gb)
2x BFG 8800 Ultras
Antec 900 case (5x fans)
Antec Quattro 1000w PSU

Recently got the above system.
I'm looking to overclock withon reasonable rates... and have very little
expertise in the subject.
Looking in bios everything seems to have been set up on "auto".
When the system boots it shows the following memory settings:-
800Mhz Tcl:5 Trcd:5 Trp:5 Tras:18 - which seem to be the correct
settings on the Corsair site

I've tried overclocking using the AI overclock facility in bios (about all
I'm capable of doing!)... at 15%. (3.29Ghz)
After a while the system seems to become unstable.
I have however noticed that on boot up the memory settings have changed to
5:6:6:20 respectively. Should I manualy change these settings back to the
original 5:5:5:18 ?
Any advice or other hints in respect to overclocking would be appreciated

Thanks
John Hellingsworth

On Sun, 03 Feb 2008 13:05:19 GMT, "John Hellingsworth"
<jghellingsworth.RemoveThis@ntlworld.com> wrote:

>Hi
>
>Asus Striker Extreme Bios 1305
>Intel Conroe QX6850 3Ghz
>4gb Corsair XMS2 DDRII 800 - PC 6400 C5DHX (being recognised as 2.5gb)
>2x BFG 8800 Ultras
>Antec 900 case (5x fans)
>Antec Quattro 1000w PSU
>
>Recently got the above system.
>I'm looking to overclock withon reasonable rates... and have very little
>expertise in the subject.
>Looking in bios everything seems to have been set up on "auto".
>When the system boots it shows the following memory settings:-
>800Mhz Tcl:5 Trcd:5 Trp:5 Tras:18 - which seem to be the correct
>settings on the Corsair site
>
>I've tried overclocking using the AI overclock facility in bios (about all
>I'm capable of doing!)... at 15%. (3.29Ghz)
>After a while the system seems to become unstable.
>I have however noticed that on boot up the memory settings have changed to
>5:6:6:20 respectively. Should I manualy change these settings back to the
>original 5:5:5:18 ?
>Any advice or other hints in respect to overclocking would be appreciated

Overclocking is such a large topic it would be hard to cover
in a few usenet posts. Basically, you need to find the
source and cause of the instability. For example
overheating of CPU under load may cause it but you don't
report your temps nor do we know the rest of the computing
scenario under which it's instable, and what happens to
suggest the instablity (crash, reset, freezing, etc).

Eventually you will want to avoid the AI overclock and
manually set things, but first you need to know what is
instable. Before running (Windows?) run memtest86+ to see
if you get memory errors. You should take all steps
necessary to be rid of memory errors before running the OS
as anytime you have these errors and windows or you write a
file to the HDD, etc, it might corrupt it then you have more
problems differentiating between multiple problems.

If the memory isn't stable you might need to increase memory
voltage some, retest and try manually setting more relaxed
timings. I don't know exactly what the peak speed and
timings are (expected to be on average) for that particular
memory, so through testing or reports from other users of
same memory you might get an idea. If all else fails and
memory still holds back the FSB increases to gain CPU
clockspeed, there might be an asynchronous memory clock
setting so your memory runs at a lower divisor and thus you
can further raise FSB before things get instable.

After memtest86+ can run without errors for many hours (if
system integrity is very important, I suggest running the
test for at least 24 hours after your final changes), though
as soon as you see one error there is no point in continuing
the test instead of stopping and trying a new memory config
then retesting.

Once your memory tests stable boot windows and try Prime95's
Torture test, as with memtest86+ it should run for hours
without errors or can be stopped as soon as you see one
error, at which point you do similar to memory by increasing
CPU voltage, decreasing CPU temp if it looks too high
(generally, if it's over 60C at full load that will indicate
your peak speed may be limited by the CPU temp. It may run
fine at 65C, even approaching 70C, but there's a heat issue
if getting into this range).

Decreasing CPU temp may mean better case ventilation, higher
CPU heatsink fan speed, a different heatsink, lowering
vcore voltage, or just reducing clockspeed. Ultimately only
you can find where your stability threshold is and keep
lowering speed and voltage (manually) until you get there.
IF the AI o'c settings aren't raising the voltages to memory
and CPU, that is probably why they are failing but as
mentioned previously, you probably want to manually
overclock for more control of the parameters, and be sure to
monitor the temps if raising voltage.