That is just what I was after, thank you very much!
Personaly I can't see how it would make a diffrence between the X58 and the P67 as at the end of the day isn't it the same bandwidth on both boards? If this is wrong or even if I'm using the term bandwidth wrong then please let me know.
The bus has the same bandwidth for PCI-E 2.0 on any motherboard. There are older articles that showed a performance hit when you ran x8 x8 on PCI-E 1.1 as opposed to 2.0.
PCI-E 1.1 was 250 MB/s per lane vs 500 MB/s per lane on 2.0. Most cards can run fine on PCI-E 2.0 x8 with the exception of maybe highend dual GPU cards. It's all in the amount of bandwidth you have available to the bus.