I read that rivatuner was the one to use to oc my vcard so I gave it a shot but.. Here's my problem, when I adjust my core clock,even a little(6-8mhz), with rivatuner 2.01, run my first benchmark,3dm2k5, it crashes. Same with Aquamark. Running the 158.22 in XP.. It just occurs when oc'ing the vcard. My top 3dm2k5 score is 19970 without oc'n the vcard, just the system. You think I'd get a little oc out of this Evga. I'm probably missing something.