A little while back AMD sent out some letters to retailers scolding them for selling AMD Athlon processors that were advertised as overclocked. TheRegister got a bit of clarification on why AMD was doing this and what the concern was. What's this mean? Well dont worry, AMD isnt stopping retailers like Kryotech, they just voiced a bit of 'concern' on the issue and want to make it clear that this stuff voids warranty.