7990 vs 390x

[skellyjoe97]

Hi guys.

I currently have an hd7990 and am wondering in what situations a 390x would outperform it.  I read that the 7990 had more texture mapping units, higher floating point performance, more shading units, more compute units.  Is that because it's basically two 7970s?  What situation would a single 390x outperform my card? Is it worth the money to upgrade?

[Arwanell]

if the game fully supports xfire, then 7990 is better

 

so 390x would outperform your card in poorly dual GPU optimized games

[stealth80]

Id say its a side grade, hard to tell as the benchs are quite far apart, I tried comparing here with a 290X and theyre very similar

 

http://www.tomshardware.co.uk/charts/2015-vga-charts/17-Battlefield-4-2160p,3680.html

 

Id go at least a Fury or a 980ti if you have the $$$

[skellyjoe97]

Just now, Arwanell said:

if the game fully supports xfire, then 7990 is better

 

so 390x would outperform your card in poorly dual GPU optimized games

What if my mobo only supports x16x4 crossfire? Would a single card then outperform it?

[Arwanell]

1 minute ago, skellyjoe97 said:

What if my mobo only supports x16x4 crossfire? Would a single card then outperform it?

your GPU is dual on single PCB, tha being x16

your second PCIe has no impact on the card

[Lord_Karango17]

3 minutes ago, skellyjoe97 said:

What if my mobo only supports x16x4 crossfire? Would a single card then outperform it?

dual gpu cards generally have plx chips on board, so as long as you have one pcie slot thats above gen 3 8x, you will be fine.

[skellyjoe97]

2 minutes ago, Arwanell said:

your GPU is dual on single PCB, tha being x16

your second PCIe has no impact on the card

When I look in gpu-z it comes up as x16 x4?