The 4 series Radeons seem to have a problem with Il2. I've had intermittent crashes with 4850, then it continued with 2x4850 in CF... different driver versions, better cooling, all sorts of shenanigans... nothing helped, from time to time it would just crash. I've bought a 5870 recently and (knock on wood) no problems since (had 10.5 working, switched to 10.7 recently). IMO it's either a problem with that particular silicon, or faulty cards (some small fault to which Il2 is sensitive) or somehow the OpenGL driver issues that just weren't ever resolved for the 4 series...
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