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First time OC on a Phenom II 975 Black

post #1 of 7
Thread Starter 
Hi, this will be the first time I have tried CPU overclocking, I have some experience overclocking graphics cards, so I reckon the basics should be familiar enough.

I recently got a Cooler Master EVO 212 to replace my stock heatsink as it was starting to show some age, and it was so effective that it has given me quite a lot of thermal room for OC'ing, so I thought now was as good a time as any to learn.

I have a Phenom II 975 Black Edition at 3.6GHz, it's a quad-core Deneb. I've been told it's begging to be overclocked. I have 8Gb of Corsair Vengeance running at 1333MHz.

I have been looking at guides online for a couple of days but I understand that Black Editions, with their unlocked multipliers, overclock differently and I can't find relevant information on if that means I still have to mess with the RAM timings and the North Bridge and such. I don't want to make mistakes and edit any settings I don't need to touch, so I thought I would ask here.

Does anyone have any step by step guides for overclocking Black Editions through the BIOS, or perhaps any advice?

Also, people have told me to use AMD Overdrive rather than doing it through the BIOS but that doesn't sound like a very good plan to me.
post #2 of 7
Its easy with black editions. All you need to do for a basic overclock is change the multiplier.
What Motherboard are you using?
And yes you are correct, amd overdrive is not a good plan.
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by vr028 View Post

Its easy with black editions. All you need to do for a basic overclock is change the multiplier.
What Motherboard are you using?
And yes you are correct, amd overdrive is not a good plan.

Yeah I'm only starting out so I only want to do basic stuff, if I can get from 3.6GHz to 4.0GHz I'll be very happy.

So I don't need to mess with the RAM timings or the NB at all then? I can just :
-raise multiplier
-boot
-test
-go back to the BIOS if it fails a Prime95 test
-repeat
Is that correct?

My motherboard is pretty basic, it's a Gigabyte GA-880GM-D2H
Edited by Dansrage - 10/25/13 at 6:08pm
post #4 of 7
Overclocking on that motherboard is risky. Personally i wouldnt OC on this board as your processor has a 125w TDP and the motherboard only has a 3+1 phase VRM.
Your new cooler does not blow air onto the VRM zone like the stock cooler did so this makes things much worse.
Here are 2 good threads you should have a read through first regarding VRMs.

http://www.overclock.net/t/943109/about-vrms-mosfets-motherboard-safety-with-125w-tdp-processors

http://www.overclock.net/t/946407/amd-motherboards-vrm-info-database

If you still want to oc then proceed with caution and be prepared for a possible hardware failure. Raise the multiplier so that you add 100mhz at a time.
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post #5 of 7
Thread Starter 
I'm looking at the AMD motherboard database in that article you linked.
There are two GA-880GM-D2H models, one is the r4.0 and one is the r3.1. The 4.0 is listed as 'not for overclocking' and supplies 95W, the 3.1 is listed as 'OC with cooling' and supplies 140W. Seen as the Phenom II 975 is designed for 125W, can we assume that my GA-880GM-D2H is the r3.1? If it's the r3.1 it has a 4+1 phase VRM. Or am I reading that wrong?
In the case that it's an r3.1 does 'OC with cooling' mean the VRM has to be cooled, or the CPU?

As I understand it a 4+1 phase board will croak if you push too much voltage through the VRM, but if I don't intend to overvolt, is that still an issue?
post #6 of 7
yeah the 'with cooling' is most likely VRM cooling. there are custom heatsinks you can buy or make for this kind of thing.
Do you know what revision your motherboard is? if not you can check using something like cpu-z.
Even without overvolting you can run into problems because the processor draws more power.
My main concern in that your evo 212 does not blow onto the vrms. Quoting that thread it said:

OCN member mdocod has found that as of 3 March 2011, at least 71% of the VRM cooling failure incidents in the compiled list of horror stories have happened on a cooling that deviates from stock cooling. This value may be higher due to the amount of situations where cooling was not described.

I had limited success using a 78 lmt s2p and a fx 6100 at 4ghz for about a year. i returned it to stock when i noticed some slight discolouration on the back side of the board where the vrms are. Like any overclock though, you do it at your own risk and must be prepared for something to completely fail.
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post #7 of 7
Thread Starter 
Yeah, well thanks for your advice, I think I'll hold off until I get a better board, not really worth the small performance increase if I blow the VRM.
My next upgrade will be a better motherboard then, I've had my eye on the GA-990FXA-UD3 for a while, that's backwards compatible with my Phenom.
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