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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 252.09

-0.3%

Jan 29 3:59 PM EST

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To: fyodor_ who wrote (39236)	5/12/2001 2:33:40 PM
From: John Evans	Read Replies (1) of 275872

I have placed P6 series processors (Celeron 366s oc'ed to 550) in motherboards without a fan and with the bios overheat protection disabled. They would run for about a minute and crash. After a 5 minute cool down, they would be fine. I believe that the catastrophic shutdown has been a feature of Intel processors ever since the Pentium MMX, although it has not been documented as such. Catastrophic shutdown and thermal monitoring appear to be separate systems -- indeed, it seems they use separate on-chip diodes. In order for the shutdown feature to be reliable, it would have to be automatic. High temperatures in the PC case could cause other components to fail before the processor -- e.g., the graphics card. In turn, this could cause a driver level crash or infinite loop with bios interrupts disabled. Relying on software (bios) for catastrophic protection seems too risky.

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