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I5-750 and P7P55 WS Supercomputer

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March 21, 2010 11:23:17 AM

I have a P7P55 WS Supercomputer and an i5 750. I have DDR3-1600, but it defaults to 1333. Everytime I try to use the 1600 MHZ timings, it sets my multiplier to 17. Well I want it to be at 20 or 21. When I do that, it isn't stable. Might run an hour, might run 4 or 5. I wanna know what can I do to make it run fatser. Maybe hit 3.4 or 3.5 with the i5. I read it's a tricky chip because of the fact that 1156 boards max FSB is 1333mhz, but if I'm going to be stuck at a certain point, I might as well go for the i7-860. So far, even at 1333mhz it sits at 2.8 GHZ. Also my bios is 702 for the motherboard.

The RAM i'm using is Patriot Sector 5 G Series PC3 12800 8GB.

any help is appreciated.
a b K Overclocking
March 21, 2010 10:08:01 PM

bvzxa34 said:
...1156 boards max FSB is 1333mhz...

What? Where on earth did you hear that?

The default base clock (bclck) for the P55 chipset is 133MHz, times your multiplier to get your CPU frequency, and times your RAM multiplier to get your RAM clock speed. The P55 ALSO has a very limited choice of RAM multipliers, so you can get only a few speeds, of which DDR3-1600 is not one. Therefore, your bclck has to be overclocked to reach the correct number to get your RAM to reach its full 1600 speed. Your CPU multiplier then drops to keep it as close to stock as possible.

Your CPU should be perfectly capable of running with the full multiplier at 160 bclck, which would land you at around 3.2GHz. You should also be able to keep it at stock voltage. However, you may have just gotten a chip that doesn't like to be OC'ed. Just try and up your voltage a bit, keeping it around 1.3 or 1.35 max.
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March 21, 2010 11:12:36 PM

how can I find out if my chip can be oc'd or not...this is annoying. Should I turn speed step and everything else off?
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a b K Overclocking
March 21, 2010 11:30:25 PM

Your chip is NOT being OC'ed, as it changes your bclck up and your multiplier down, so the speed stays virtually the same (within 50Mhz).

Run a program called CPU-Z and it will tell you what speed you are running at.
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March 21, 2010 11:56:58 PM

Yeah I'm aware of that. In fact I changed my bclk to 170. I was close to 3.6. And then BSOD. I use CPU-Z all the time. PersonallyI like all my multipliers. I set the voltage to 1.31, but it crashed at that speed, so I have it set to 160. With the multiplier at 21 I'm at 3.3. Maybe you're right about my chip not wnating to overclock.

When I had it to 3.59ghz, Iwas running prime95, the max temps hit about 69c using the small fft test. I keep going though this loop with OC'ing this mosnter I built. I thought it was my CPU cooler. I had a dynatron which is better than stock, but could not handle the temps and hit 99c when I did 3.5ghz running prime95. This Zerotherm cooler is much better. It hit 72c a few days ago, but when the AS-5 setteled it never reaches 70c.

I have OC'c in the past, but it was on my old P4. I am a builder's builder. I build computers for other people but not for me. I had a P4 2.4 running at 2.7ghz for 6 years. So bare with me becasue I'm going from a socket478 to a 1156. I missed 775.

How far can I up the voltage to run stable at 3.5 ~ 3.6. If I continue I may be needing an i7.
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