Micronics W6-Li System Lockup

[Neo]

Hardware:
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Micronics W6-Li motherboard
(2) Pentium Pro CPU's (256k/1mb cache; read below)
VXI 5v VRM

Problem:
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When running PPro CPU's with 256k cache, everything is fine. When I pop in PPro CPU's with 1mb cache, the system runs for a while and then just locks up. Rebooting fixes the problem, for a few minutes, and then it's back to freezing. Note: both sets of CPU's are matched perfectly.

Question:
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Is it simply an overheating issue, or could a 5v VRM simply not be enough to power these energy suckers? If anyone knows for sure, let me know what it is that I have to change.

 

[Neo]

Check for a bios update for the board. Does sound like a PSU issue though. What size PSU are you useing? Have you tryed uping the voltage a little to the CPU?

BIOS revision is known to be the most current. PSU is Highpower 420 watt, brand new. How would I up the voltage to the CPU? There are limited options pretaining to hardware settings are this is a 1997 board, and one designed for corporate server applications at that. I really have no idea if it's possible to manually set voltages on this board.