Indeed. I have Detonator 40.72 drivers as well, with Win XP and Leadtek Winfast GeForce 3. No stuttering and very good performance indeed. I have Asus A7V333 motherboard with Via Hyperion 4.46 drivers installed, with AMD Athlon 2100+. If I try to upgrade to any other Detonator drivers, CMBB stalls. I have noticed that the driver upgrade also degrades the performance with Operation Flashpoint - Game of the Year edition. It suffers from same kind of stuttering. Detonator 40.72 seems to be the only good driver version I can use. OFP tech support suggested that it might be due AGP settings with certain Via chipsets (KT333), but this does not seem to be the case. Only thing that affects the performance clearly, are the Detonator drivers. Direct3D version does not seem to have any effect, I had the same problems with 8.1 and 9.0 and 9.0a.