I can see artifacts on my desktop just clicking thourgh windows 2000 and all my 3d games lockup. I am using an SD11 and I have tried the reference and CL drivers. I haven't even overclocked the board since I noticed the problem from the start. Im pretty sure my board is defective. Which leads me to the question of whether Compusa will take the board back for an exchange or will I have to mess with CL tech support? The guy asked me if I wanted some warranty when I bought it but I said no...waste of $20 bucks at the time I thought. Someone please let me know if they have taken something that has been opened back for exchange. Thanks.