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Overclocked E6750 resets to stock, won't overclock again

Last response: in Overclocking
December 25, 2011 3:20:49 AM

I've had my intel E6750 (stock 2.6ghz) overclocked to 3.2ghz just by changing the FSB to 400 with a multiplier of 8 for probably over a year now. I just went to put in new ram (4 gigs of ddr3 1066) and when I did, I saw the CPU overclocking was reset. I tried to put it back to 8x400 and it wouldn't take. I put the old ram back in (2 gigs of ddr2 1066) and the CPU still won't overclock. I even raised it by 1 single mhz and still nothing. What could be the problem?
a c 172 à CPUs
a c 197 K Overclocking
December 25, 2011 4:15:12 AM

Don't know. What motherboard?
December 25, 2011 4:18:17 AM

Gigabyte PA-P35C-DS3R, rev 2.0

Someone suggested reset the CMOS. I've never dealt with the CMOS before.
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December 26, 2011 2:46:56 AM

Somehow I managed to be stabled at 2.8ghz and right at this moment I'm at 3.0ghz, haven't stressed it yet or anything, but it booted.

I was looking at my old files and I saw at 3.2 ghz I used to be at 32*C for my CPU. Right now I'm at 48*C. Sounds like an overheating problem. I haven't touched it at all, but I'm thinking something could have happened to the thermal paste? The fan is still tightly secured.
a c 172 à CPUs
a c 197 K Overclocking
December 26, 2011 6:14:56 AM

If you are idling, 48C sounds high. But anything under 70 C is safe.
December 26, 2011 6:20:26 AM

Sorry yes, I left out that those two temperatures were at idle. I ran Prime95 and within 1 minute temps were exceeding 67*C, which was the max temp hit in the 4 hour session I did when I was first overclocking.
a c 172 à CPUs
a c 197 K Overclocking
December 26, 2011 6:35:09 AM

67 C is on the high side of safe, especially since you normally will not ever be running at a constant 100% load.
January 5, 2012 10:56:29 PM

Just an update: So I'm not sure what the deal is, but I tried slowly upping the bus speed, and I was at 375 MHz for a week or so no problems. I reapplied thermal paste to the CPU/heatsink, figuring that might have been a problem since it was last applied 3 years ago. About 3 days ago I upped it again to 400 MHZ, and again no problems. So right now I'm back at 3.2 GHz.