Chris Miller wrote: > Thoughts? Check your bios/system event log for any indication that it is logging memory errors? Most modern server class motherboards (past 5 years) do this, though not always reliably. I've also had trouble with memtest86 myself, I prefer to run ctcs: http://sourceforge.net/projects/va-ctcs/ The software is really old and is picky what you build it on, if I recall right I could only get it to build on RHEL/CentOS 4 not 5 (though the binaries work fine on 5). It does a good torture test which in my experience can find problems faster than memtest86(which can take days). nate