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also 5970 or 6990 work in lion with no flash? no boot screen mean that i would not be able to press alt and choose to go in windows or mac?

6000 series work too.[/QUOTE]
 
So I could leave the HD 2600 in and swap screen over if I needed bootscreen.
 
also 5970 or 6990 work in lion with no flash? no boot screen mean that i would not be able to press alt and choose to go in windows or mac?

6000 series work too.
[/QUOTE]

yes, believe so (maybe need add device id) but only 1 core, so same performance as 5870/6970

So I could leave the HD 2600 in and swap screen over if I needed bootscreen.

yes
you would probably want to save a EFI card if you go this route, as you probably cant boot OSX install DVD with a PC card
 
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