How does Crossfire work?

[star_pilot475]

If I had a Radeon R9 380 and an RX 570 could I run them in crossfire or do they have to be the same card? 

[3 Lions]

I'm pretty certain that they have to use the same GPU core. 

[TheSLSAMG]

The cards have to utilize the same core, but they can differ in the number of SPs and amount of VRAM. The R9 380 and RX 570 use different GPU cores from different generations, so it's a no-go.

 

Your R9 380 can crossfire with another R9 380 or an R9 380X, since they both use the Antigua core. The RX 570 can crossfire with the RX 470, RX 480, RX 570 and RX 580 since they all use the Polaris 20 core.

[GoldenLag]

They need to be the same GCN generation as far as i know. And R9 380 and RX 570 arent. 

 

 

Also i wouldnt recommend it. Like SLI, it doesnt really yield much

[Windows7ge]

I believe there are some cases where you can make it work with mis-matched cards but ideally you want them to be identical. What you're getting out of the 2nd card is the compute power and if it's going to split that load with the primary GPU you'd want it to be just as capable. With sufficient VRAM too.

[xAcid9]

20 hours ago, TheSLSAMG said:

The RX 570 can crossfire with the RX 470, RX 480, RX 570 and RX 580 since they all use the Polaris 20 core.

RX 590 too i guess?

[name is isaac]

On 4/12/2019 at 8:51 AM, star_pilot475 said:

If I had a Radeon R9 380 and an RX 570 could I run them in crossfire or do they have to be the same card? 

from last I heard, yes you can crossfire with any Radeon GPUs... unlike ISL.