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I'm guessing these won't be compatible with PCI-E 1.0 ?, or will it be a case of it works with 1.0 but with lower performance ?
Gonna wait and see what happens, but it'll probably be a 4870XT if any.
why?

I don't have money to burn, and it looks like the GTX will be the $500 monster and the 4870XT will be the value card. So unless there's a competitive GTS part I probably won't be able to afford it. I broke the bank pretty badly for the X2.
Also after my 8800GT debacle I swore i'd never take another nVidia card until they started cleaning their driver act up. I was apprehensive beforehand as i'd been stung like that before, and it all blew up in my face again.![]()
Fairy fluff mate.

Interesting...
You've asked this question, but failed to answer it yourself!
Is Easy going to be splashing out?
Gonna wait and see what happens, but it'll probably be a 4870XT if any.
, there's meant to be an HD4870 though! 
I'm guessing these won't be compatible with PCI-E 1.0 ?, or will it be a case of it works with 1.0 but with lower performance ?