PC Graphics

[bladevampire]

So I was able to get my hands on a second R9 380, and thought I'd try crossfire out. I would love to get this working, but I have found that only one GPU is working. I feel like this question has been asked many times before, and I've tried disabling ULPS, yes both devices are being recognized by the computer, and AMD Catalyst Crossfire option has been activated. I have sufficient power for my set up. I've got nothing....please help.

I don't believe it should matter, but my original card is an MSI R9 380, and my second is an ASUS Strix R9 380.

[black_zion]

Which games are not using both GPUs, and does Radeon Settings show a Primary Adapter and Linked Adapter?

[bladevampire]

I was playing Hero’s of the Storm last night, I found through a bit of research that not all games are set up to use dual GPUs. So that could be an issue, do you know of any widely available games that use Dual GPUs?

[goodplay · Accepted solution]

There is this user based list, but would still pay to check on the game forum of what you might want to try, before buying.

http://amdcrossfire.wikia.com/wiki/Crossfire_Game_Compatibility_List

[black_zion]

In addition to the list that goodplay posted, don't forget that DirectX 12 and Vulkan do not use Crossfire or SLI as such, as that's a DirectX 11 and earlier feature, they use the multiple GPU feature in the API meaning the game developer has complete control over if it uses multiple GPUs or not.

[goodplay]

Just to add, have you read https://www.amd.com/en/support/kb/faq/dh-018

[bladevampire]

Yeah, I found basically all his information after some investigating. Thanks for the reply! I appreciate it, it’s a shame they don’t work as widly spread as I thought. But I didn’t pay for the second R9 380 so it’s still a win for me!

[colesdav]

Hi,

Since you look into DX12 MultiGPU or DX11 Crossfire.

Do you have Ashes of the Singularity or Ashes of the Singularity Escalation?
If you do could you run DX12 MultiGPU test with your cards and see if you get any positive scaling at all?
That list https://www.amd.com/en/support/kb/faq/dh-018

It still  claims excellent scaling and that used to be true 2 years ago when the RX480 was launched.
I don't know if the developers gave up on it or there is something wrong with latest Adrenalin Drivers but all I see is negative scaling and poor performance on that benchmark for > 1 year. I have tried a range of Graphic settings and resolutions from lowest to highest.

I have reported this on this forum and to AMD Reporting Form a number of times. 

Other DX12 Titles like Sniper Elite 4, Hitman, Rise of the Tomb Raider etc are running really well for me in DX12 MultiGPU..
Recent Titles such as PREY runs great in DX11 Crossfire.

Check both your motherboard PCIe slots have enough PCIe bandwidth to run Crossfire though.

The fact you got your second R9 380 for nothing means you should be pretty happy if you have those titles and DX11 Crossfire / DX12 MultiGPU works.

Since Ashes is running really badly in DX12 MultiGPU  and given that it is called "Ashes of the Benchmark" it might be a good idea for someone in AMD to look into that.

Bye.