bad RAM chip cause DELL 2650 continue crash

[mcclnx mcc]

We have DELL 2650 server with Redhat AS 3.4 installed
on it.  Recently I found following messages on log
file and server continue crash .

Aug 26 10:10:49 ORA1 kernel: Uhhuh. NMI received.
Dazed and confused, but trying to continue
Aug 26 10:10:49 ORA1 kernel: You probably have a
hardware problem with your RAM chips

I replace all RAM on DELL 2650, but it still continue
happen.  

Anyone know what wrong it is?

Thanks.

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