I'd borrow some memory and see where it works(if it does at all). Maybe it's the memory itself. Otherwise, I'd lean towards new mobo time, as I'm pretty sure that the mem controller is on the mobo. If it wasn't, I'd try swapping out the CPU as well.
To answer your original question, though... dunno any mobo tests.
Edit- Just wondering, what started this? was it stable? or did it do this when you upgraded somehow?
To answer your original question, though... dunno any mobo tests.
Edit- Just wondering, what started this? was it stable? or did it do this when you upgraded somehow?