My XFX 8800GT crapped out. Sent it back to XFX. Excellent customer service btw. My only complaint it...I had a 670Mhz GPU that took a dump. XFX sent me a "670Mhz" replacement card. Installed it. Checked on NVIDIA Control Panel...only registering 600Mhz??? WTF? Am I doing something wrong here? I can overclock the card on NTune but why does the sticker w/ serial number and order number PV-T88P-YDD4 telling my this replacement card is 670Mhz when it is only 600Mhz...