Originally posted by: JeffreyY
nikkai, from what I've read the IHS on the E4300 is attached with thermal grease and not soldered on like it is in the e6xxx and this results in higher temperatures. I have a similar issue with my chip with a Thermalright Ultra 120. At 3.15Ghz I'm hitting close to 70C in TAT. People have recorded >10C drops in temperatures after removing the IHS but it requires quite a bit of modding to get your heatsink to fit properly so I have no attempted it. I have remounted my Ultra 120 over 5 times with varying amounts of thermal grease and trying ceramique vs AS5 and nothing changed the outcome much. I decided to blame it on the way the IHS is mounted to the chip. :/ My heatsink also feels pretty cool to the touch when the CPU is under load so my only guess is that the heat is not being properly transferred to the IHS and to the heatsink. This is all speculation from the reading I've done about this subject so if anybody has more accurate information feel free to correct me.
It's hard for me to believe that all these 4300s are running HOT due to poor contact between the cap and chip. My thermal profile is about the same as yours. Note that TAT was originally designed for P4, not C2D. C2Ds have two throttling profiles, 85C and 100C. Most lower-end chips should fall into the 85C category, with the quad cores running @ 100C. To check the throttling of your 4300, simply crank up the heat and set the BIOS/windows software to throttle the chip. I've seen 89C TAT with my 4300, but no throttling. This tells me that TAT's reported temperature is wrong.
I think RMClock gives a better estimate of your CPU temperature. RMClock is 10 to 15C lower than TAT.
Crank up Vcore. Use TAT to load CPU @ 100% and check for thermal throttling. A quick 3-5 minute run up to 95-100C TAT should not affect the long-term reliability of the CPU. If you don't want to increase Vcore, then run the Ultra 120 without fan. That should also quickly bring the CPU temp up to 100C in TAT.
Record the temperature when the CPU start to throttle (probably around 100C TAT). The maximum "safe" operating temperature for your chip is approximately 20C lower. Why 20C? Because the maximum rated temperature of 4300 is 65C with 85C as the throttle temperature (20C delta).
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