Normally in rF2 and AC I use the Nvidia SLI mode to get best fps with SLI enabled. Noticed today that my nVidia Control Panel had set my rFactor SLI mode to 'Force alternate frame rendering 2' by default after upgrading to nVidia GeForce v337.88 drivers. When I initially tried to enable SLI in GSCExtreme with the SLI Visual Inidicator enabled, I did not see any SLI running at all !?!? So I changed the GSCExtreme SLI mode to 'Force alternate frame rendering 2' (instead of Nvidia SLI) and now it is working great! Getting around 150fps - 200fps with my Lenovo Y500 SLI Geforce GT 650M laptop. Really pleased with GSCExtreme, great job by Reiza on using the rFactor engine to bring another great sim racing experience to life!