2x gpu do they work together?

IceUK · 25 Nov 2022 at 09:59

2 X GUPS, do they work together?

I have a Sapphire Radeon RX 6800 XT NITRO+ OC 16GB as my main GPU and a spare Sapphire Nitro+ Radeon RX Vega 64 8GB, will these two GPU'S work together in a system giving me more FPS or am I wasting my time in that only one will run the game and the other will just be idle as the monitor is not plugged into it

Thx John

zola25 · 25 Nov 2022 at 10:15

Linking two GPUs used to be a feature for both nVidia and AMD cards, however both GPUs had to be the same or similar models. Both have abandoned the concept now, with only nVidia's 3090/4090 offering the capability, and even then I believe that is only really supported for workstation tasks rather than games.

The short answer is therefore no, this will not work unfortunately.

Orcvader · 25 Nov 2022 at 10:28

As above, Crossfire/SLi is pretty much dead. DirectX 12 does have its own multi GPU but requires the game developer to do all the work to support it instead of the drivers, and I don't think I've seen any game supporting this.

Only reason you want a second GPU is either due to needing to connect a lot of monitors, dedicated encoding/decoding GPU (if it supports better codecs for example), or crypto mining (which is no longer viable due to changes in the crypto market).

Zarax · 25 Nov 2022 at 11:30

IceUK said:
2 X GUPS, do they work together?

I have a Sapphire Radeon RX 6800 XT NITRO+ OC 16GB as my main GPU and a spare Sapphire Nitro+ Radeon RX Vega 64 8GB, will these two GPU'S work together in a system giving me more FPS or am I wasting my time in that only one will run the game and the other will just be idle as the monitor is not plugged into it

Thx John

I know only one game that would allow you to take advantage of 2 different GPUS: Ashes of the Singularity

erill1971 · 25 Nov 2022 at 12:51

Orcvader said:
As above, Crossfire/SLi is pretty much dead. DirectX 12 does have its own multi GPU but requires the game developer to do all the work to support it instead of the drivers, and I don't think I've seen any game supporting this.

Only reason you want a second GPU is either due to needing to connect a lot of monitors, dedicated encoding/decoding GPU (if it supports better codecs for example), or crypto mining (which is no longer viable due to changes in the crypto market).

A few games support it, but it's only about 10 or so, and it's not getting any larger

Jumper118 · 25 Nov 2022 at 13:30

yes you can use 2 gpus on amd, but they have to be mildly the same.
https://hwbot.org/submission/4645759_jumper118_3dmark___time_spy_2x_radeon_rx_6900_xt_29253_marks/ here i used 6900XT + 6800
https://hwbot.org/submission/4646013_jumper118_3dmark___time_spy_2x_radeon_rx_6900_xt_33710_marks/ the this is 2x 6900XT

IceUK · 25 Nov 2022 at 15:34

Fair enough thx for the answer. Much appreciated

Orcvader · 25 Nov 2022 at 15:40

erill1971 said:
A few games support it, but it's only about 10 or so, and it's not getting any larger

Ah right, completely forgot about Ashes, they always cropped up in early testing back then since they were usually the first to support these sort of things. I think Deux was another one if I remember correctly.

@Jumper118 that's with DX12 multi GPU isn't it? Meaning 3DMark actually put in support for the benchmark. Crossfire was mainly for DX11/OpenGL which is no longer supported.

Purgatory · 25 Nov 2022 at 15:46

Zarax said:
I know only one game that would allow you to take advantage of 2 different GPUS: Ashes of the Singularity

Actually a lot more but we won't let facts get in the way...

I use 2 x 3090s in SLI/NVLINK BTW. Maybe use some google skills to see how many are really supported.

Also no I don't recommend it going forward as game devs are too lazy to support it these days. So buy one better gpu than two for gaming. For work related apps dual gpus still work and work very well.

Zarax · 25 Nov 2022 at 15:50

Purgatory said:
Actually a lot more but we won't let facts get in the way...

I use 2 x 3090s in SLI/NVLINK BTW. Maybe use some google skills to see how many are really supported.

Also no I don't recommend it going forward as game devs are too lazy to support it these days. So buy one better gpu than two for gaming. For work related apps dual gpus still work and work very well.

I never said it's the only game that does, just it's the only one I know. And I'm not talking about SLI but DirectX 12 multi-GPU feature.
If you know about more games that supports it please name them, I'd be extremely interested.

Purgatory · 25 Nov 2022 at 15:53

Zarax said:
I never said it's the only game that does, just it's the only one I know. And I'm not talking about SLI but DirectX 12 multi-GPU feature.
If you know about more games that supports it please name them, I'd be extremely interested.

NVIDIA Support

nvidia.custhelp.com

There has been more and not added to the list since Nvidia stated the changes to SLI for 30 series, AMD still also has crossfire enabled and all Nvidia gpus before 30 series still have full SLI enabled for all games that have SLI profiles too.

DX12 and Vulkan support SLI and Crossfire if devs enable it in their games too as the API's have built in mGPU support.

Jumper118 · 25 Nov 2022 at 16:23

Orcvader said:
Ah right, completely forgot about Ashes, they always cropped up in early testing back then since they were usually the first to support these sort of things. I think Deux was another one if I remember correctly.

@Jumper118 that's with DX12 multi GPU isn't it? Meaning 3DMark actually put in support for the benchmark. Crossfire was mainly for DX11/OpenGL which is no longer supported.

Yes it only works in the dx12 benchmarks unfortunately. In the amd driver it's labelled as mgpu. It works in unigine super position too

Zarax · 25 Nov 2022 at 16:41

Purgatory said:
NVIDIA Support

nvidia.custhelp.com

There has been more and not added to the list since Nvidia stated the changes to SLI for 30 series, AMD still also has crossfire enabled and all Nvidia gpus before 30 series still have full SLI enabled for all games that have SLI profiles too.

DX12 and Vulkan support SLI and Crossfire if devs enable it in their games too as the API's have built in mGPU support.

Again, I'm not talking about SLI: https://www.overclock.net/threads/whatever-happened-to-dx12-multi-gpu.1748604/

Purgatory · 25 Nov 2022 at 16:56

Zarax said:
Again, I'm not talking about SLI: https://www.overclock.net/threads/whatever-happened-to-dx12-multi-gpu.1748604/

That is multi gpu supported games now not SLI if you read it.

Tired9 · 25 Nov 2022 at 18:54

I do recall having GTX 480 in SLI, went back to a single card when the FPs was higher but felt less smooth.

cjgardens · 27 Nov 2022 at 02:16

Tired9 said:
I do recall having GTX 480 in SLI, went back to a single card when the FPs was higher but felt less smooth.

Loved my 480's used heat the room up in the winter.

z10m · 27 Nov 2022 at 04:06

Purgatory said:
That is multi gpu supported games now not SLI if you read it.

@Zarax is talking about explicit multi GPU support and AotS is the only game I know using it.
You can use any 2 GPUs together although you will double the performance of the slowest GPU in the system.
I remember using it with GTX 980ti and RX 480 which was giving me slightly more performance than 980ti on it’s own.

Zarax · 27 Nov 2022 at 07:04

z10m said:
@Zarax is talking about explicit multi GPU support and AotS is the only game I know using it.
You can use any 2 GPUs together although you will double the performance of the slowest GPU in the system.
I remember using it with GTX 980ti and RX 480 which was giving me slightly more performance than 980ti on it’s own.

This is what I meant.
In the OP case, it would mean basically doubling the Vega64 FPS, which the 6800XT might be close to do on its own.