How would crossfire work on this mainboard? - 16x and 8x

[Gimpymoo]

I have this board:

http://www.gigabyte.com.tw/Products...rd&ProductID=3010&ProductName=GA-MA790XT-UD4P

It does say:

2 x PCI-E 2.0 x16 interface with ATI CrossFireX support for ultimate graphics performance

1 x PCI Express x16 slots, running at x16 (PCIEX16_1)
1 x PCI Express x16 slots, running at x8 (PCIEX8_1) (Note 3)
(The PCIEX16_1 and PCIEX8_1 slots support ATI CrossFireX technology, and conform to PCI Express 2.0 standard.)

I allready have a 5770, if I got another, how would this effect performance on this board?

Thanks.

 

[SfnX]

ive seen a post showing the x8 vs x16 interface, if im correct it stands at 93% efficiency vs x16 so youll still get 93% of the cards power! tbh it is still worth it, 7% is like 1-5 frames depending.

 

[RavenXXX2]

As your mobo is a PCI-E 2.0 standard, the performance difference between 8x and 16x is negligible going by the online tests I have seen.

 

[Gimpymoo]

A 5770 on the Christmas list it is then

Thanks.

 

[MoRT489]

According to that page they would run at 8x 8x. The reviews suggest a max difference of 7% but usually less so go with it