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i5750 - Overclocks

Depends on the CPU really, I'd recommend keeping the temps below 70*C in P95 and 8hrs stability in small ffts mode. It really depends on your needs and rest of the rig too.

I believe 3.6Ghz can be achieved with stock volts (1.25V or lower).
 
3.6ghz is pretty high for a UD-2 with 8gb of ram. Having 8gb will hold you back and bit, and the UD-2 isn't a particularly great board for overclocking.

http://www.bit-tech.net/hardware/cpus/2009/09/21/overclocking-intel-s-core-i5-750/1

Have a look at this guide. The bios for the UD-2 should be fairly similar to the UD-4. It lacks a lot of the heatsinks and stuff seen on the more expensive mobo's in the series.... so it won't handle higher voltages as well.

Still, you should be able to get it a good chunk higher than the stock voltages. Read that guide, and see how far your hardware will go. I'm expect you'll be able to get it to at least 3.2/3.4 without any problems.
 
Between 3.4-3.6, but really depends on temps. Like said above 8 GB will hold you back a bit, i personally would try for 3.4 and see how that runs using prime95 and as long as your temps are sub 70 you should be fine.
 
The motherboard will not be a problem for a modest overclock. I think when you start pushing maximum voltages under load to the CPU that the board might not be ideal. So i would not worry on that regard.
 
I've been running my i5 750 at 3.6Ghz since the day of release on a Gigabyte P55-UD2, I can't remember exactly what BIOS settings I am using now but I can take a look when I reboot if you wish. I only raised the voltage very slightly, I do remember that ...I hit 4GHz but it was using too much voltage and getting too hot so I backed it off to the point where it was barely hotter than stock and stable no matter what I threw at it ...which turned out to be 3.6GHz. This is with 4GB of ram though not 8 ...which as mentioned might slow you down a bit more.
 
I managed 4ghz on my i5 750, but wasn't at stock volts. Just keep a close eye on your temperatures the further you go up, and I agree with the others - 8gb will hold you back some.
 
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