[Trifid]

Hello.

I am experiencing a couple of problems with my overclock. My specs are:

I have a Intel 920 D0
Gigabyte UD5
12GB OCZ 1600MHz RAM
7800GT
Corsair 620w PSU

Overclock settings:

Bus speed 190
CPU on a 20x multiplier (21 with Turbo)
RAM on a x8 multiplier, 1.5v
Vcore at 1.23
Memory timings have been loosened to 9, 9, 9, 20
Turbo and C1E enabled

I believe that is everything.


SuperPi is stable at 10.281s for 1M, failed prime95 after a couple of minutes (I loaded Firefox at the same time).

Second problem I have is it also fails to post on cold boots. If I restart as soon as I hit Windows and reapply the overclock it will boot fine and run SuperPi no problems.

Does anyone have any pointers to improve the stability of the Overclock?

I know I am already putting a lot of strain on the memory controller running 6 sticks of RAM.

Thanks for the help.

[tastegw]

bump your ram voltage to 1.64-1.66

also, make sure your uncore is atleast 3200MHz
and your QPI is near 1.3v or better

7800gt? you plan on getting something better sooN?

edit: another thing you can try after the above is done, is try the 19x multi... it is said that it is more stable than the 20x, but i can neither confirm or deny that statement

[Hefemeister]

1.25 should be almost enough vcore for that clock. perhaps bump it up just a touch. should not need more than 1.3 but do not move it all the way to 1.3. small bumps and test with prime.

what is your qpi/vtt set at?

Superpi 1m is by no means a test of stability. If you fail within 5 minutes in prime you are very unstable. I like to see at least 1 hour of prime before I start to feel good.

[Trifid]

According to my notes, QPI is at 1.175. Will try it higher in the morning. VTT is at 1.375. Would I need to increase RAM voltage with it running at stock/below stock? It's rated for 1.65v so no harm in upping it.

I want to put as little as possible stress on the memory controller, would using a lower multiplier still be beneficial? Should I turn Turbo off and get it to 4GHz with a bus of 210MHz? Think I would have to set memory multiplier to 6x which would help.

7800GT? Possibly. I've not really gamed on my PC since the 7800GT was considered really good.

[AP4LIFETN]

Hmm, how is it that your able to run 6 dimms at 1600mhz, I was under the impression that the x58 can only run 3 dimms at 1600mhz, but 6dimms at 1333mhz or lower. Perhaps that why your OC is unstable, try running the dims at 1333mhz instead?

[tastegw]

test your ram, @ that low of voltage when you have it running @ 1600, i think thats your problem. along with your QPI voltage, up it to atleast 1.3

[Trifid]

x19 multi, QPI at 1.3 and RAM on a x6 multiplier has made it worse. BSOD on bootup.

It was stable (prime 2 hours) at 1600MHZ at 3.2GHz CPU.

[tastegw]

what was your ram voltage?

[Trifid]

Think it was at 1.65. Should it need more than stock though? Was running it at 630 on the 6x multi. Will bring the overclock back, when I get back in a couple of hours.

[Trifid]

To confirm it was at 1.66v.

3.7GHz doesn't want to be stable anymore. Put it back to 3 for the moment (primed stable for 14 hours with memory at 750/1500MHz.)