Defective RAM can cause ANY error in the system.
You might try to use the RAM in a bios mode with more waitstates... Some 'supertuners' use simply not enough waitstates for the ram and for some time this may work though out of spec. Maybe your bus is overclocked, too?
Very often, you'll have more fun with your 'puter if you use it slower.
An other problem might be that the thingy simply is too slow (i.e. you're playing wav's through cool edit with lots of effects used...)
aXel