the graph is showing the gt200's performance relative to the 3870x2 thus in crysis the gtx 280 is projected to be 80% (.8 times) faster than the 3870x2. the reason certain benchmarks show higher than others is because the more demanding games (like crysis) have more room for improvement. so if you were gettin 40 frams in crysis on the 3870x2 they're saying you'd be getting 72 frames with the gtx280. now in cod4 the 3870x2 already has high frames so the system run will definetly bottleneck a card that is supposed to be of that magnitude. all in all it could be bad drivers on the 3870x2, but this is the performance we'd expect of a real next gen.
and the guy at xs is a moron if he thinks the 4870x2 will only be 65% faster than the 3870x2. the 4870 single is reported to be that much faster (65-70%) than the 3870x2 atm. which places the 4870 quite nicely against the gtx260 and the x2 seems like it will stomp the gtx280 but time will tell. It all depends on the number of shaders on the 4870. some say 96 shaders by 480sp. but looking at the early leaked die pics. it seems more like 160shaders by 480sp.
Given the fact of the drivers used on the X2, the up and down performance in different games and the fact they kept X2 at 1x clearly suggests that the older drivers for the X2 (when those results were obtained) are having a more predominate effect on the GT200 performance level then what you suggest in any single game. Besides, almost all of them are TWIMTBP titles. We have to agree if they used a more recent Cat (were game performance was boosted) those results would be lower. Maybe not by much but they would be lower.
Also note how the GT200 also doesn't improve much in Unreal 3 engine title UT3.
Crysis uses Cryengine 2, which nv had
boosted spending many hours working with
Oblivion uses Gamebryo. I still don't see this engine used in newer titles
COD4 uses COD4 engine
COH uses Essence 1.0 engine
Prey & ET:QW uses id Tech 4 (found in games like Doom, Quake 4, etc)
Fear uses the Lithtech: Jupiter EX (haven't seen this engine used since 2002 or so)
UT3: U3 engine
WiC uses Masstech Game Engine