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Yet a another thread about Phenom II 955 OC

post #1 of 14
Thread Starter 
Hello, OCN.

I've been a long time reader, but now i really need your help, because i'm getting desperate.

I've been trying to get 4.0ghz stable with my system:

955BE c3
m4a785td-v evo
2x2gb 1333mhz markvision memory 9-9-9-24-33
2xhd6950

I managed to get 4.0ghz @1.525vprime95 small FFT min:8k max:8k memory used :0mb
stable. i ran it over night , stopped the test with 6hours 25minutes. no errors.

However when i try doing the blend test, to see system stability, i get bsod in the first 2 minutes.

I've done blend test for 2 hours in system at stock, and it was stable.

I've tried: upping the vcore to 1.55
upping the VDDNB to 1.4
Vram to 1.6
Ram to lowest multiplier
Upping the chipset volts to 1.4
upping CPUNB speed to 2200, 2400, 2600 and volts to 1.2, 1.3, 1.4
ran memtest and rams are ok at stock setting, which they are.

CnQ and C1E are disabled.

Bios setting are:

[ht ref] 200

[cpu mult] 20x
[cpunb mult]10x
[vcore]1.525 stock-1.4
[vddnb]1.1 stock
[vdda]2.5 stock
[LLC] 19,35%, dont have disable, and this gives the least vdroop


[ht link mult]10x
[htlink bandwidth]16bit
[ht link volt] 1.2

[ram mult] 533mhz
[ram timmings] 9-9-9-24-33
[Vram] 1.59 stock

[chipset voltage]1.1 stock
[sb voltage] 1.35 stock


any ideais of why my system is not stable at 4.0ghz prime95 blend, but at stock 3.2 it is? Since its 4.0ghz prime small FFT stable???

I'm redoing prime95 small fft to check again if really stable, and max temps are 54-55ºC
Thanks guys
Edited by Erick - 5/28/11 at 7:19am
post #2 of 14
My first guess would be, it could be the RAM holding you back. CL9 1333 ram is poor quality no matter the manufacturer tbh, seeing as its apparently only failing blend?
post #3 of 14
Thread Starter 
I ran memtest after failing blend test, and it did not show any erros, should i try one stick of ram?
post #4 of 14
Try getting the cpu northbridge in the 2200-2800 range first
Try going up on the ht ref - something like 245/250/255/260
Down on the cpu multi - 15/15.5/16/16.5

That's what worked for me. Here's the post - LINK to OCN post
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Farragut's Folly
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post #5 of 14
Let me clarifiy on above, This doesn't nessessarily mean your ram will produce errors, it just means the ram is of lower quality, most/all CL9 1333Mhz ram is pretty bad tbh, seeing as its pretty much the lowest ddr3 ram you can get (including my own). But this is just a guess bearing in mind.

You should also get your NB higher then stock for a 4GHz OC, will produce more stable results along with higher performance. You will generally get more performance from a CPU @ 3.6ish with a NB overclocked by around the same marginal increase, then a CPU overclocked higher by itself with no NB OC tbh, other then synthetic benchmarks etc.

Do you have the bios option to enable LLC for the CPU, and for the NB/CPU? VDroop is usualy the bain of people's lives after ~3.8 on PH II
Edited by Asmodean - 5/28/11 at 7:32am
post #6 of 14
for small fft, try 20k 20k instead of 8k 8k for 2 hours

http://www.overclock.net/general-pro...-settings.html
quick n dirty prime95 stress guide
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post #7 of 14
The RAM should not be a problem. Run NB at 2400-2600MHz with 1.2v on NB. Run Hypertransport at 2000-2000MHz voltage on auto. Here where it is tricky, 1.3-1.35v on CPU/NB and 1.55v+ on CPU. You will push over 55. Upper 50's is still OK. Try 1.55 v on vcore.....Good luck.

BTW, 2 hrs prime 95 is not long enough. NB gets maxed stressed 2.5 hrs. Run it for 3. If temps get over 59, you will need better cooling.
Edited by PureOC Jim - 5/28/11 at 10:36am
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post #8 of 14
It's not bus clock overclocking so the RAM shouldn't be holding anything back. However in case of any bus clock overclocking, then it could things back.
post #9 of 14
Thread Starter 
Ok guys, here is what im doing.

I put CPU clock back to stock @ stock volts, everything on stock [ typed in bios NOT auto]
and set my CPU NB to 2600mhz @ 1.4 and im running prime blend 2048k to 4096k 15 each, 30 min so far now.

Didnt get any errors nor BSOD's. So if i pass about 3~4 hours like this, i can asume that 2600nb is stable?

Then start getting my CPU back to 4.0ghz like ASMODEAN suggested.

Pure OC JIM, whats the max cpunb voltage i sould use? im doing 1.4v right now. Is there any problem going over 59ºC? stability-wise, i've read somewhere that someone e-mail a person from amd about the max temp, and that person replied that silicon damage only starts at 97++ºC, of course i'll never let it go that far.
At stock clocks and nb at 2600@1.4v im getting 47ºC load temps.

When i start overclocking the cpu with multiplier, should i up the VDDA voltage? Since it's related to the cpu clock multiplier voltage?

Thanks guys.
post #10 of 14
I've been messing about with a 785 chipset board, and I've found too much voltage is nearly as bad for stability in prime95.
Myself, I've been running up the oc using the ref. clock, then bumping voltage to cpu slightly. If that doesn't solve it, I bump the cpu nb voltage. I'm running 2580 MHz NB with .1 bump to 1.2v. If I go higher, I get unstable after a half hour.
one thing I'd suggest: if you have ACC, setup a stable test with prime95 and let it run for several hours. You might find some cores complete fewer tests than others, or look at the cores that fail prime95. I found tweaking ACC, bumping just a bit, can reduce those individual core failures.
My setup is -.2% (default) on cores 0, 3, and +.6% on cores 1, 2 worked well, and I was able to get another 100 MHz on OC.
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