Performance of Crossfire 7970's in 8x/8x

steamywildwood · Sep 6, 2013

I ordered an additional 7970 yesterday because the price was right, but I'm aware that I will be running my cards in 8x|8x instead of 16x|16x my question is what kind of hit am I going to take on performance?

I'm just curious, some people tell me the difference will be un-noticeable.

spentshells · Sep 6, 2013

Can I ask what motherboard you are using?

even pcie 2 running at 8x should not be an issue at all.

Guest · Sep 6, 2013

It will increase FPS in Games

J_E_D_70 · Sep 6, 2013

MaximumPC just did a comparison with x8/x8 vs x16/x16 with high end GPUs and if I recall correctly it's only about a 5% penalty so still a good upgrade.

JackNaylorPE · Sep 6, 2013

On PCIE-3 it will be small..... On PCIE-2 it is noticeable.

make sure you d/l the 13.8 Beta driver.... it fixes some of the problems w/ CF .... tho issues remain

steamywildwood · Sep 6, 2013

spentshells :

I'm using an Asrock Exreme4 z77 motherboard (The Toms hardware approved one)

spentshells · Sep 6, 2013

steamywildwood :

No problem then

steamywildwood · Sep 6, 2013

That's really good news, even a 5% loss like some of you said wouldn't be so bad

Guest · Sep 6, 2013

steamywildwood :

my cards running 3.0 x16 & 2.0 x4. it works great in crossfire!

spentshells · Sep 6, 2013

steamywildwood :

my cards running 3.0 x16 & 2.0 x4. it works great in crossfire!

Which cards?

Is this a B75 motherboard?

Guest · Sep 7, 2013

spentshells :

Which cards?

Is this a B75 motherboard?

asus hd7790 direct cu 2 OC 1GB
No, Im using Asrock H77m.
But your cards are better than my cards..lol

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Performance of Crossfire 7970's in 8x/8x

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