I have my 4890s pushing 900 Mhz and I down-clocked the memory by 25 or 50 Mhz, can't remember which. Thanks. It's fun to watch the points pile up like that. I am probably up to rank 5 and past SazanEyes by now. It really makes me want to buy a used 5870 if I know I can run it in the same system with my 4890s. I saw in another thread where Dookey was thinking of selling one and picking up a Fermi.