If ram fails at stock and recommended voltage as far as i am concerned it's rma time.
Could it be a data/drive strenth problem?
Yeah I get paid today so I might nip to the local PC shop near me and buy the cheapest DDR2 Ram they sell (providing it isn't too expensive, they aren't the cheapest of stores).
if you can find cheaper ram than that at those timings ill eat me shorts
*Looks at popular competiting website*
I sir, reject your challenge.