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Originally Posted by Disillusion
Basically, the 1.8 (745) is about as far as you're going to go. I had great luck with mine and only had to up the voltage from 1.340 to 1.388. Some people can't get their 745 to overclock at all. A friend of mine just recently got a 745 and we tried to pinmod it. We gave it nearly 1.6 volts and it wouldn't even POST. So, you can try the 745 but I'm not going to guarantee that it will overclock at all. Basically, the lower the clock speed is on the CPU you get, the greater your chances are for a stable overclock. Good luck with your decision.
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There are a few P-M 755 chips out there that have been succesfully OC'd by pin-mod with a volt-mod. I bought mine here in the FS forum a while back, and it runs stable at 1.468v (have to ground VID4 then back off at startup with NHC). It's fast, but runs warmer than I would prefer - 68C after several hours of Prime95 with fans on high.
I love the speed, but would trade down to a 1.8 > 2.4 chip that did not require volt mod for the thermal advantages.