Caporegime
erm... none of the processors in that graph have hyperthreading?
all it does show is that a 920@4ghz and a 2500k@4ghz both get about the same FPS (along with an FX and we all know how rubbish they are)
edit; I'll run with HT on and off now and see if it makes a difference on caspian 64
There was a big thread about it on guru or overclock and people were reporting large gains with it on. Can't find the thread now, but loads of people were saying it.