I'm overclocking a q6600 G0 on a P35-DS3L motherboard. I've disabled C1E and EIST and I'm trying to run prime95 @ 9x378 and 1.4v but the CPU keeps reverting to 6x378 well below the Tjunction. SpeedFan says my max core temp is 62 celsius. Is it really CPU TM2 that's doing this or something else? Thank you.
Are those core temps Idle or load? If the temp is to high then the cpu will trottle itself back even if EIST or C1E is dissabled. Core temps under load shoulnt be over 70c(that is the highest safe temp). Try HWmonitor to monitor temps and do a 10min run with prime95 and post load temps.
Are you using an aftermarket cooler.
I have the same problem. Under Load (IntelBurnTest) my q9550 throttles at 52-53 Degrees C. This is fine at stock(2.83Ghz), however when I overclock, it automatically throttles down to 6.0 ratio as temps hit 50+ Degrees.
This might be because the power provided by the motherboard is just not enough for quads when using a four pin power connector.
To get real overclocking, you could try a better board with an EPs 12v (8pin) connection and a suitable power supply.