Yeah, they kick a$$! In SLI GTX460 are faster than GTX480 and cost less! Best P/P!
Jup, it's because your CPU is wating for work from QPT. Ok it's not tehnicly corect but hope you get the point.
Higher QPT/BCLK is bether then highest multipalyer(-that goez four unlocked CPUs)
As for SuperPI and simular just pump the multiplyer.
For 3DMarks Timings are not so inportant, you'll get more points out of RAM MHz than Timings.
But for things like SuperPI Timings are really inporatant.
I hope i explained some things in raw so you know what to look for.