K7T266 Pro2 V2.0 & Athlon TB 1400C

Question

Hi!
I bought an MSI K7T266 Pro2 Board. I put an Athlon Thunderbird 1400C on it. The PC boots but after 10 sec it starts booting again. The temp of the CPU is about 50 C says BIOS.
The CPU already worked on another Mainboard and also worked with 50 - 55°C. Now I put an Athlon TB 750 on the K7T266 Pro2 Board and it works --> strange...
I flashed the BIOS but nothing changed. I also tried to start the CPU with 133 MHz FSB, no difference...
The German MSI-Support has no solution... perhaps here is sb. who can help me
System
MSI K7T266 Pro2 V2.0 (Bios Version 3.7)
Athlon TB 1400C (133 FSB)
(Cooler Master HAC-V81 with copper cylinder, works up to AthlonXP2800+)
Sapphire Atlantis Radeon 9700
Seagate Barracuda V 80GB
512 MB RAM (No-Name, CL2.5, 333 MHz, double sided chip)
Power Supply:
Combined Power: 400 Watt
3,3 V - 28 A
5 V – 40 A
12 V – 17 A (I know it should be 18, could this be the problem)

Answer 1

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it doesn't goes over 55°C and the Homepage of AMD says that the CPU stands up to 85°C
85°C inside the die but the temp shown in the bios is measured at the bottom of the cpu (your board doesn't support the xp internal temp-diode).
The temp inside the die is about 15-20°C higher than the temp at the bottom of the cpu, so your cpu has more than 70°C inside! And remember, when you're checking the temps in bios the cpu is only in idle mode, temps in windows are normally much higher.
The tb1400 produces much more heat than your tb750, so your headsink may be insufficient.
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Could this also happen because of lack of thermal grease?
You need grease but to much grease isolates! Only a wafer-thin layer is required but it must cover the complete die (nothing else!).