Unix PC crashing

[Rex Fowler]

My unix pc is crashing extremely often, always with the same 
panic message similar to:

	*hpte: 0xnnnn
	panic: NM1 (kernel parity error)
	double panic:

When I say "extremely often" I mean - I boot the machine and it usually
crashes within 2 hours! 

I booted the diagnostic disk and found no memory errors.  What else
could cause this?  Could the infamous dust-bunnies be at fault?  
I hope it something that simple.

note: I'm running v3.51 

Any words of wisdom?
thanks,


-- 
Rex Fowler	rmfowler%texrex at cirr.com
		cs.utexas.edu!egsner!texrex!rmfowler