testing memory

[Johnson, Shaunn]

Howdy:

Running RHEL 3.0 on x86 box.

Is there some tool or method for testing memory?
I'm getting general kernel panics and I've gone
though all of my hardware replacing and removing
and all I have left is the memory.

I'd send you the message, but it's kinda large.
If you want to see what it says, I'll try to 
trap the message.

I'm thinking that it is the memory only because
I had to install Windows Server 2003 and it
crashed twice last night and the browser
died a number of times.  A message look to be 
memory related.

Thanks!

-X