MemTest86 failure vs MS diag pass....?

[GeezerButler]

Guys - quick question. I've been having some instability on my rig recently which turned out to be a bad DIMM. But with working tested DIMMs, I'm still unable to get a MemTest pass when using more than one DIMM. Memtest just reboots about 5 seconds into the single core test. However, when I run the Windows 7 memory diag it passes with no problem.

Does this just mean that the Windows memory diag is rubbish?

PS - Board is an MSI P35 Neo2

 

[GeezerButler]

Thanks - I tried MemTest86+ and worked - diag passes OK with 4 dimms.