K6 450
ASUS P5 99VM
Minitower ATX minimal venting on the lower right and a hole wher the tower's speaker's should be.
Power supply directly above the processor which for some stupid reason blows warm air into the case and on to the processor.

I have done all proper troubleshooting i.e. cleaning, BIOS flash, checked the bus speed and multiplier settings. With no hood on the case and a household fan blowing on it the issue disappears.

I don't want to mod the case or start filling it up with fans as this is a trade-in that I'll pass on to charity. I looking for a cheap alternative if there is one.

Is there some way to reverse the polarity on the power supply's fan. Forget that I just asked that as I have just found out that the darn power supply is spot welded together! I would consider replacing the power supply but it's an odd ball shape from a now defunct manufacturer (DKT Computer). (Gee I wonder why?)