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I am eager to share my best overclocking experience. I was configuring my computer. I have used the Core 2 Duo E7500 and a Gigabyte motherboard. After the complete build and installations of necessary things I finally booted my computer. I then increased as much as voltage into the CPU just for for quality testing. The best thing happened is I was able to reach 5.0GHz@~1.5V and even I can boot without any issues. That was really exciting for me.
The Core 2 Duo E7500 has a locked multiplier x11 with a 266 Mhz bus (2,926 MHz = 2.9 GHz), so normally we can only modify the bus OC board. Upload the plate Bus 266 Mhz 275-285 Mhz and go on increasing from 5 by 5 until you see the system unstable, usually with a bus> = 333 MHz is necessary to go a bit processor voltage.
In these processors unless you disable the options in the BIOS varies between 6-11 multi according to the needs of performance. So you should get in x11 run any application as strong as a Benchmark program. I think you can raise the Vcore to between 1.35-1.40 v without any fear, just to prove that after passing a test of 20-30 minutes Burn temperatures are acceptable.
I would say that temperatures allow a slight overclock. 3.3-3.5GHz. with regard to the parameters I cannot give you a hand because I do not know much about overclocking. I can tell you that you currently have with the vcore to 3.5 should hold comfortably. You should set this value to the bus to 300/320 mhz multiplier to 11x. if it is stable to small steps you can lower the vcore to contain temperatures. I repeat for overclocking your PC expects an opinion from the experts, perhaps by opening a new thread in the l Overclocking
I too have the E7400 on Asus P5QL-Pro, the same OC (333x10.5), and holds for almost 3 years, more stable. I've never done any stress tests, but was never planted on games, video encoding, etc .
The voltages are all over the processor, even the vcore, I stress that detects up to 1.21v. The temperatures are low, and in all cases are not problems as I have said the standard series. I can also depend on ram, or even feeder (or excessive in relation to the power consumption), it is said that depends exclusively on the motherboard, although in this case it seems more probable.
Meanwhile, clean everything well, if you have thermal paste, change the old one and it put a new one. 3.3GHz is not very high, you should get there without problems. Get OCCT, you need to see stability, cpu-z you need to see the voltages and latencies of the ram. Damage cannot combine until they raise the voltage.
I got so far to 3.6 GHz with FSB only, without touching anything else. just the C1E and speed strap or something similar that I have disabled the bios.