I'm running the beta drivers (clean install) with the beta patch (from a clean install) and it makes no difference whatsoever (GTX580). Still get stutters at low level (even with lowered settings) and awful slowdown with flame/smoke effects etc. Good framerates generally......just the micro stutters which are the main problem really. Plays Rise of Flight smooth as silk though, with excellent frame rates.
I wouldn't buy another thing 'for' this sim......its the crap unoptimised code that is to blame (which Ilya has essentially admitted) and you can't really buy your way out the problem; if you try to atm, you have more money than sense.
They are trying to fix it though to be fair, so we'll see.
EDIT: HANG FIRE! I'm actually using the 285.27 BETA drivers, NOT the 287.36, so my mistake (didn't realise a new BETA had come out). I'll give this a try and report back, hope it does better. Cheers.
EDIT II: Should I go for the .36 or .38? Since there is a good report for .36 I reckon I'll try that first.