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Windows 7: Amd phenom ii 955 be c3 overclock

30 Jun 2011   #11

Windows 7 64 bit
Amd phenom ii x4 955 stable at 4.0ghz

Ran into more issues with my overclock, mainly because i decided to stress test it.

It seemed to pass everything but then went a bit haywire when i tried Intel Burn Test on a very high (4096) setting, it then had a period of not being stable above 4Ghz at all.

So i went back to the start and retried lots of different settings.

This setting has passed IBT on both standard and high settings for 10 runs at about 48.6 Gflops.

It passes PIMaxx also with a rating of 567.

its just finished a four hour stress test of Prime 95 and so I am thinking its pretty much OK.

FSB : 250 (x16)
CPU : 4.0Ghz or 4000Mhz at 1.50V
NB : 2500Mhz at 1.3125V (x10)
HT : 2000Mhz (x8)
DRAM : 417Mhz or 834Mhz DDR2 12GB RAM at 6-5-5-18-20-2T

As can be seen the core temps were getting quite up there at 59C.

I have ordered a new cooler as i believe that this CPU does have 4.2Ghz in it, it booted and ran several stress tests at this speed and I think the temps be holding it back, Voltage is 1.5V at the moment so there is some small room to adjust higher.

Attached Thumbnails
Amd phenom ii 955 be c3 overclock-aida-cpuid.png   Amd phenom ii 955 be c3 overclock-aida-64-oc.png   Amd phenom ii 955 be c3 overclock-prime-95-4-hours.png   Amd phenom ii 955 be c3 overclock-aida-64-bios.png  
My System SpecsSystem Spec
30 Jun 2011   #12

Microsoft Community Contributor Award Recipient

Windows 7 x64

lol it's starting to sound most like this old 6850 chip I have.
Got it to take a good clock once and should have left it alone, never got it higher than 3.8 again after I messed with it.
My System SpecsSystem Spec
01 Jul 2011   #13

Windows 7 64 bit

Well, new cooler has arrived and I have shaved around 3C off the max temps when loading 100% with IBT or Prime95, I thought it might give me the leeway to get my 4.2Ghz which was a high target to set myelf.

I have gone from an Arctic Cooling Freezer pro 7 rev 2 to a Hyper 212 from Coolermaster, there is an improvement and i guess it hasnt settled yet, even using the mx-2 thermal compound with the Freezer pro, it dropped by about 4-5C after a short bed in period of a few days, this compound is not supposed to need curing but go figure.

It will boot and run at 4.143Ghz all day, will pass Maxx PI, Aida 64 stress test, everything apart from IBT, when running IBT it blue screens with secondary processor clock interupt error.

So max clock for me is 4.022Ghz which is Kinda OK.

I think this is the limit for this processor, tried max voltage i would go to at 1.55 and it still crashed after 3 runs of IBT.

The extra Mhz was giving me an extra 1 gflop in IBT before it crashed so i guess not worth worrying about.

The new cooler will allow me to rest assured that even at very high stress my Temps should stay at 55C core temp.

I must add, that i am still using the cool and quiet feature as I like it.

As long as the multi doesnt go past 18X, then C and Q will still work, I think maybe that is holding the clock back also but one of my targets was to be able to keep this on and still achieve a high clock.

I mean without it, i could easilly set 20X multi and get my 4.2Ghz, maybe get it stable too but hey ho for 1 Gflop??

Cheeers Guys
My System SpecsSystem Spec

03 Jul 2011   #14

Windows 7 Ultimate x64

Stick to 4GHz and get the bus speed and L3 cache to the highest speed you can.
My System SpecsSystem Spec
04 Jul 2011   #15

Windows 7 64 bit

Hi, for some reason i cannot get the NB speed above the 2440, I dont know if its is my RAM that is holding it back, if I try say 2664 then it will boot but BSOD with system service exception error. maybe the CPU speed is too high to support such a high NB speed.

At 4.143Ghz, the system boots and plays FSX and runs all benchmarks but was playing Assassins Creed and it crashed to desktop, not sure if it was the GPU though.

At 4.022Ghz, its IBT stable after 15 runs on a very high setting at 1.5125V, tried upping to 1.55 to get the 4.143 stable but no joy.

Read somewhere that the NB needs to be higher to maintain the higher CPU speed but i get that System service exception, even with the CPU lower than 4Ghz, havnt tried going down to 3.8Ghz and 2664 on the NB but also read that to get the high NB then the CPU needs to be around 3.8GHz?

Not sure, anyway system gives best benchmarks obviously wth 4.143, but they are about 5% higher only, hoping that this IBT stable frequency will be stable for everything.
My System SpecsSystem Spec
15 Jul 2011   #16

Windows 7 64 bit

Well, been running the 4.022Ghz for a few weeks now and have had no issues except a memory management bsod, which i assume was memory timings, i altered the timings from 6-5-5-15-20 which is what auto was giving me to 6-6-6-18-24 which is the rated timing for my current ram, all is very stable.

All games working well, can play for hours without any issues.

Max core temps while gaming are 51C with idle at 31C.

Wierdly though CPU temp is reporting as 47C idle and 57C loaded.

big difference between the two readings but i understand that core temps are more important.

My GTX470 after hours of gaming is max 69C which i understand is pretty cool, I have the fans on the gigabyte card set to a personal profile where the fan speed curve has a higher gradient, this coupled with a 120mm side fan blowing air right at the card helps to keep this temp down.

My RAM is running at 813Mhz with 10gb installed, a 4gb and 3 2gb modules, strangely this works despite everything i read about memory issues and matching the ram etc.

Anyways have decided to get some OCZ reaper ram, 8gb rated at 1066mhz 5-5-5-18

Gonna try to get the ram either at 1066 or at 850mhz running 4-4-4-12 just to boost the system and to make doubly sure that ram is stable long term.
My System SpecsSystem Spec
16 Jul 2011   #17

Windows 7 64 bit

Seems it could well be the HTT speed that is holding me back now, any higher than 244 and Intel Burn Test on very high settings says its unstable.

So with the new RAM, best figures keeping Cool and Quiet on are:

HTT : 244Mhz
CPU : 4.022 Ghz at 1.525V (16.5x)
DRAM : 975mhz @ 2.2V 5-5-5-15-24- 2t
NB : 2440Mhz
HT : 2193Mhz

This is with cool and quiet enabled as i say, I think the NB maybe could go higher without cool and quiet as if i raise the multiplier it gives a system service exception bsod, which to me suggests that either it is due to my CPU mutli being near stock and so the NB needs to be stock (10x) or its due to cool and quiet not allowing the multi higher than stock for the NB. Or its the issue as mentioned earlier where 3.8Ghz is the good setting for a high NB as well.

Just not too sure, I am pretty certain that its HTT holding it from stability though cause at 250Mhz and lowering the multi to 16 to give 4ghz, a frequency that I know to be stable, IBT gives instability and its definitely not RAM cause that still only gives 1000mhz on the RAM which is rated at 1066Mhz?

Any ideas, thoughts or opinions most welcome, I would like to get my NB higher, I think I am stuck on the RAM though at 975Mhz as getting any higher would require the higher HTT speed.
My System SpecsSystem Spec
19 Jul 2011   #18

Windows 7 64 bit

Well, this will be the final post on this subject as i have reached the limits of my overclocking!!

Several weeks of trial and error and a RAM upgrade later and i know this much:

CPU max is 4.02 Ghz for IBT (maximum test) stability

NB max is 2440, any higher and i get BSOD, could be because all four slots are populated.

My board WILL run 8GB DDR2 1066Mhz at the right frequency.

This is the final config:

HTT: 268 Mhz
CPU: 4021Mhz or 4.02Ghz at 1.525V (x15)
NB: 2412Mhz (x9) at 1.325V
HT: 2144Mhz (x7)
DRAM: 536Mhz (1072Mhz) DDR2 8GB 12:6 ratio

IBT maximum stress test stable.

Core temps idle: 28C
Core temps IBT max load: 62C
Core temps gaming max: 53C
CPU temp idle: 44C
CPU temp IBT max load: 60C
CPU temp gaming max: 51C

Attached Thumbnails
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My System SpecsSystem Spec

 Amd phenom ii 955 be c3 overclock

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