Put single core AMD FXs and the high end opterons under the highest catagory because those are definitely faster than the slower X2s. Also, the slower laptop Core Duos will not run it reasonably.
Just look at the bechmark YOU linked to. A single core AMD at 2.8 is even faster than a dual core at 2.2 in most games.
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Opteron 144 @ 2.75GHz 1.525V
7900GT @ 632/1612 1.3V
G.Skill DDR500 @ DDR548
Epox 9NPA+ Ultra S939
3DMark06: 5164