stewart.. what kinda setup are you running? i'm running w7 with 2 graphics cards, one gtx260 and one geforce 6600 topsilent (from way back). the 260 drives my central 1920x1080 screen and the ancient geforce 6600 drives the two outer screens. i'm not using triple screens for GPL (i wish i could do that). but that setup runs quite well. i never stray from 60fps - i can't stand 36fps anymore, even if the ai cars ride higher or are crappy. i'd still rather enjoy fluid visuals over slightly akward ai.
and even if you have different manufacturer (as in amd/ati vs nvidia) cards in one machine, that shouldn't be an issue. don't let people tell you it won't work. i had an x1900xt (ati) and this gtx260 (nv) running in the same machine with no issues running their separate drivers.
also make sure that you have the detail level set to 99 in the graphics settings. best done via GEM (you are using GEM, right?). otherwise set it to full in GPL, and click it one notch down, that should be 99. at 100 i have had significant performance losses with no increase in visuals that i could detect. and i consider myself very picky in the gfx department.
also with some of the latest nvidia drivers (if you have a nv card) i was getting pretty bad slowdowns and flake fps. so i went back to a rather old one i knew to be stable and fast. almost 60fps everywhere, except at the back of a field on race start. but that is mostly down to your CPU power, not gfx. unless you have a really old one, but then my gtx260 wasn't cream of the crop when it was new, some years ago and it still does a pretty sterling job.
/edit oh and it's sad to see you get back to doing 1:20s at kyalami in less than a week, where my best efforts of ALL time have only yielded a 1.22.4 ('67)
Edited by sky, Jul 11 2012 - 02:10 PM.