There have been a few problems with certain batches of AMD K6-2 300 CPU's. I do not know off the top of my head which batch numbers they are but it sounds like you have one of them. My advice woiuld be to try it on another board ( if possible ) or take it back to the store for testing. If it is faulty then I would suggest changing up to a K6-2 333 ( not a 350 as they have soome problems to with the FPU ).