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OC'ing 955BE, CPU ratio and voltage/HT questions

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December 14, 2009 7:33:58 PM

Hey all,
I have been reading up on OC'ign for a while and have finally started tweaking my 6 week old rig. It's a M4a79xtd-evo board from ASUS with a 955BE cpu.

My ceiling goal is a stable 3.6 for now but will settle for a stable 3.5

So far I've had these OC numbers stable anywhere from 20-30 before voluntarily shutting off the test:
200*17 for a 3.4 OC
220*16 for a 3.52 OC
210*17 for a 3.57 OC

All of this on a stock voltage of 1.35V and floating at 58 C on load with a Scythe Katana 3 cooler

I know I need to stress test more to find a truly stable/Cool spot.

My questions are what to do with:
CPU/NB freq
CPU/NB Voltage
CPU VDDA Voltage

and

HT Link Speed
HT Link Voltage
HT Width

Currently, all of these settings are on auto and I would like some direction before I start further stress testing and possibly cause damage to my components
January 3, 2010 1:40:12 PM

using amd overdrive and puting the multiplier to 17.5 you will got 3.5ghz @1.350 v
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January 3, 2010 7:40:43 PM

And like The Taz said, for 3.6GHz you don't need rise the voltage, only with rise the multiplier at x18 you can get the 3.6GHz stable.
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a b K Overclocking
January 8, 2010 6:31:45 AM

Not all 955's can reach 3.6ghz on stock voltage, I know mine can't game on those settings, however I can do simple tasks like music, videos, and web browsing on stock voltage.

Your HT Link speed should be equal or lower than your Northbridge speed. The formula is your RAM's type (DDR2 or DDR3 will be the multiplier) and speed (400mhz or 800mhz) So for example: DDR3 1600mhz RAM = 3 x 800mhz = 2400mhz on the NB/HT Link speed. I keep my voltage on auto, since I haven't had problems with that yet.

Just curious, but how come your load temps are so high? Do you have a closed case with just 1 exhaust fan?
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January 8, 2010 11:42:01 AM

^Yea, but with the mobo that he have the 3.6GHz at stock voltage must not be a problem. I have a mobo socket AM2/AM2+ and i can get the 3.6GHz at stock voltage. Now, i always use the HT link at 2000.
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a b K Overclocking
January 8, 2010 1:27:35 PM

saint19 said:
^Yea, but with the mobo that he have the 3.6GHz at stock voltage must not be a problem. I have a mobo socket AM2/AM2+ and i can get the 3.6GHz at stock voltage. Now, i always use the HT link at 2000.

Oh, hmm. It looks like I can do 3.6ghz on stock voltage. It never worked when my RAM was running at 1600mhz, I guess dropping it down to 1333 with tighter timings did help. :na: 
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