8X PCIe 2.0 bottleneck a 290X/390X?

[Mercennarius]

I asked this on another forum but would like to see what people here think as well. I currently have a 8GB 290X Tri-X and have ordered an 8GB 390X Tri-X. I would like to try them in Crossfire but my two 16X slots are too close to each other so one of the cards would have to be used in the 8X slot. is an 8X slot sufficient? Or will I be losing significant performance because of the reduced bandwidth capacity? Thanks.

 

[EarthDog]

Just look at the facts. It has been tested...

https://www.techpowerup.com/reviews/AMD/R9_Fury_X_PCI-Express_Scaling/18.html

 

[Mercennarius]

Just look at the facts. It has been tested...

https://www.techpowerup.com/reviews/AMD/R9_Fury_X_PCI-Express_Scaling/18.html

Thanks for posting the link. So looking at that it looks like a Fury X only loses about 3-5% in performance when in a 8X PCIe 2.0 slot.

 

[c2DDragon]

Hi,
I couldn't find anything for crossfire but you can check this :

https://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Express_Scaling/1.html

&

&

https://www.pugetsystems.com/labs/articles/Impact-of-PCI-E-Speed-on-Gaming-Performance-518/

I think you might not lose significant performances compared to x16/x16.

 

[EarthDog]

Thanks for posting the link. So looking at that it looks like a Fury X only loses about 3-5% in performance when in a 8X PCIe 2.0 slot.

I read 1% at 1920x1080 or above... so two cards, assuming it works this way, would be 2%.


EDIT: PCIe 2.0 slot... not 3.0.. got it.

Damn... upgrade yo.