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Overclocking amd phenom x4 965

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February 9, 2010 4:03:08 AM

hi, there i am looking to overclock an amd phenom x4 965 black edition cpu, now i have seen numerous guides,articles and persons sayign they have a solid overclock at 4ghz etc etc, however i am struggling to obtain any sort of stable overclock

I would like to get a 3.8+ stable overclock these are my specs

amd phenom x4 965 black edition
asus crosshair III formula mb
OCZ Obsidian 4GB (2x2GB) DDR3 PC3-12800C9 Dual Channel
4890 crossfire
corsair 750w psu
corsair h50 cpu cooler

I tried setting the voltage to 1.4 in the bios but it fails to start, i can overclock it to 4ghz and sometimes it will run 3dmark 06 for example yet othertimes it will freeze the pc and prime 95 can fail after 10 seconds at even 3.6ghz yet othertimes it can run for hours, so whatever overclock is obviously not stable, it also makes big black squares occasionaly appear on farcry 2 for instance, and the pc can just freeze/restart,the temps at 3.8ghz barely go over 50degrees so temps can't be an issue? So i would like some advice and info for my specific specs to achieve a hopefully high and stable overclock

thank you and i thank you in advance for any help i obtain


February 10, 2010 3:09:53 AM

What was your stock cpu VID? Are you overclocking using the core multipliers or using the bus frequency?

I have a 965 with a Crosshairs III as well. My stock cpu voltage was 1.4v which was enough to get a stable OC up to about 3.6GHz. After that i had to raise the voltage to 1.425 to get a stable overclock. Probably a good idea get a stable configuration @ 3.6 and see what temperatures look like and go from there.

Your memory is also running @ 1066 when its rated for 1600 but that can be a trickier affair than OCing the cpu as i found out the hard way.
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February 10, 2010 5:42:01 AM



Your CPU voltage is way off.. You want 3.8Ghz you need to give the CPU at least 1.425v / 4ghz is going to need at least 1.45/1.46v or higher....

Your memory is also incorrect, you need to go into the Bios and change the DRAM frequency to 1600, the timings to 9-9-9-24(CAS-TRCD-TRP-TRAS) and the voltage at 1.65v....


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February 10, 2010 12:10:19 PM

Hi newcomer and welcome to the Tom's hardware forum.

See answer here, is the process to OC a X4 955, but can help you.

I think that with only rise the multiplier at stock voltage, you can get the 3.8GHz.
February 11, 2010 9:09:15 PM

Hi, i changed the ram settings like you suggested
setting the cpu to 1.425 v and multiplier to 18, fsb at 200 makes it fail prime 95 almost instantly
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February 11, 2010 9:22:29 PM

then give it more vollts, some chips need ALOT of juice to operate at high clocks...

as long as you stay at 1.5v or below you will be fine, look at your temps at load... if it does not hit 60c you are fine...

BTW, I have my CPU at 3.8Ghz and the voltage is at 1.465v ....
February 11, 2010 11:50:50 PM

1.45 and 1.467v are still failing prime 95 after 8-10 minutes but it does seem to have improved also 1.5 volts is red in my bios
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February 11, 2010 11:54:41 PM

Keep raising the voltage till it gets stable.. you should not need more than 1.48v .....
February 12, 2010 1:32:49 AM

at 1.475 v it lasts about 45-50 minutes before failing should i increase voltage further?
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February 12, 2010 1:43:40 AM

try 1.48v....
February 12, 2010 2:24:03 AM

failing after a few minutes at 1.487
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February 12, 2010 3:04:31 AM

did you set all the other voltages or are they on "AUTO"?
February 12, 2010 3:25:01 AM

All the others are on Auto except dram voltage and OvrClkr really appreciate this help

thanks alot
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February 12, 2010 4:29:35 AM

My pleasure dude ;) 

Set them like this or at least similar =)



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February 12, 2010 4:32:37 AM

My ram is not the same as yours so make sure you use the correct timings/voltage and frequency that is specified by the manufacturer (OCZ)
March 7, 2010 8:55:02 PM

I'm willing to bet that its not the cpu crashing your OC, its the ram. It took me a long time to configure my ram to be stable @ 1600Mhz. Try setting it back to 1033 just for the sake of seeing if you can get a stable OC on the cpu side. I'm runnin @ 3.8GHz @ 1.425V but I made sure the temps stay low (52C @ load). As soon as the cpu temp goes above 55-62ish, the chance of getting a stable OC decreases (at least for the 965s).

good luck
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March 7, 2010 9:14:41 PM

I must be lucky, my 965 runs 3.8ghz at 1.400v, prime stable for 4 hours. Mind you, I have to make huge voltage jumps to get past 4ghz, but that is mostly because I am only OCing through multi and voltage bumps, mostly ignoring my NB. Will get more into tuning it once I get my new cooler installed.
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March 8, 2010 1:13:12 AM

JofaMang said:
I must be lucky, my 965 runs 3.8ghz at 1.400v, prime stable for 4 hours. Mind you, I have to make huge voltage jumps to get past 4ghz, but that is mostly because I am only OCing through multi and voltage bumps, mostly ignoring my NB. Will get more into tuning it once I get my new cooler installed.


my x4 can do 3.8Ghz at 1.4v too, i guess we got lucky ;) 


http://i683.photobucket.com/albums/vv199/OvrClkr/load38...

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