16x 8x

[alphabeta]

So butting 2 GPU in 16x and 8x how much performance is lost from the second GPU ? 

 

and in Case 8x and 8x how much from the performance is lost overall ?

[AlwaysFSX]

Next to none. Maybe 2%?

[ForsakenLive]

almost none, probably close to 1%

[alphabeta]

Next to none. Maybe 2%?

 

 

almost none, probably close to 1%

 

even in 8x 8x ?

[MightyUnit]

check out this thread where yesterday I posted the results of some tests at PCI-e 1.1 8x 8x VS PCI-e 2.0 8x 8x VS PCI-e 3.0 8x 8x.    (starting at post #40)

http://linustechtips.com/main/topic/174627-this-crossfire-is-driving-me-crazy-help/page-2

 

EDIT: sorry I see you are asking about 16X vs 8X and my tests are concerning bandwidth comparisons of the different PCI-e standards. However I think my tests show that there is plenty of bandwidth at 8X regardless of the standard.

[AlwaysFSX]

even in 8x 8x ?

Yup.