Cannot get Multi GPU to work in most games that support crossfire! - Overclock.net - An Overclocking Community

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Cannot get Multi GPU to work in most games that support crossfire!

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post #1 of 23 (permalink) Old 07-23-2019, 08:59 AM - Thread Starter
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Cannot get Multi GPU to work in most games that support crossfire!

I'm having a really hard time getting crossfire to work in games that I know support: Shadow of the Tomb Raider, Deus Ex Mankind Divided and Strange Brigade. I am using the following parts:

Ryzen 7 2700x
Asus Crosshair VI Hero
16GB DDR4
R9 280x (7970) + 7990 for 3 gpus total
Windows 10 1903
Various drivers including Adrenaline 2019 19.4.1, 19.5.2 & 19.7.2

Some games work in DX11 mode only like Shadow of the Tomb Raider ( poor scaling and 30 fps), Prey 2017 only uses 2 GPUs
DX12 does NOT work at all! Exclusive fullscreen and only 1 gpu is being used. I tried disabling crossfire and letting just DX12 auto detect multi gpu but it just won't work. Strange Brigade uses only 1 GPU in both DX12 and Vulkan.

I seen many youtube videos of people getting multi gpu to work in all these games even in DX12 so I'm not sure what's going on, I really wanted to see how triple gpus worked in 2019

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post #2 of 23 (permalink) Old 07-23-2019, 09:01 AM
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Sadly that's the way things seem to be going. I was using SLI 1070's and then Vega 64s and ended up giving up and grabbing a 1080 Ti. I don't even know why ATX motherboards are even popular anymore as nobody is going to use enough cards to fill mATX anymore.

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post #3 of 23 (permalink) Old 07-23-2019, 12:56 PM - Thread Starter
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No one has any suggestions??? There are tons of people on youtube who got all these games to work in DX12 using RX 480/580s!

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post #4 of 23 (permalink) Old 07-23-2019, 01:09 PM
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You may have to use an older driver. You are on 19.X.X, try something like 16.X.X or older.

Newer drivers may not work with Tahiti anymore.

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post #5 of 23 (permalink) Old 07-23-2019, 01:48 PM
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Or just get same cards models.

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post #6 of 23 (permalink) Old 07-23-2019, 03:07 PM
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almost need a board built for this feat in mind, has support, extra settings in bios etc. running games at half vsync used to help too


X299-WU8 LGA 2066 Intel X299 Motherboard with 7 PCIe x16 Slots
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7 PCIe x16 slots: 2 PLX 8747 design supports total bandwidth of 64 PCIe lanes and 4 dual-slot graphics cards
Supports 4-way NVIDIA SLI or AMD CrossFireX GPU configurations

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post #7 of 23 (permalink) Old 07-23-2019, 03:53 PM
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The fix is to sell both your cards and get a single more powerful card. I've been there, I did SLI a few times back when it had a lot more support from Nvidia and it still was never "good" in terms of compatibility, and things have gone way downhill for multi-GPU support in the last few years. If you can get it to work at all then you know it works, but very few games support it these days. You don't see any muti-GPU benchmarks being included in any hardware reviews anymore.

The post above suggest it's a PCIe bandwidth issue but this is for sure not the case. Multi-GPU does not need dual 16x PCIe lanes to work and having a motherboard that can do that would make barely any difference at all even in the best case scenario.

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post #8 of 23 (permalink) Old 07-24-2019, 07:05 PM
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not to be that person but you should get a card with 4GB+ (preferably 8) some modern games might run out of vram and cf wont help
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post #9 of 23 (permalink) Old 07-26-2019, 03:12 PM
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As i see no usefull comments... What about starting with just the 7990+Most recent drivers(DDU first as always). How are games scaling? All working? I have some HD6xxx cads and i know that some games won't work with those, but we are talking about old dx11 only cards.
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post #10 of 23 (permalink) Old 07-30-2019, 12:46 AM
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Quote: Originally Posted by generaleramon View Post
As i see no usefull comments... What about starting with just the 7990+Most recent drivers(DDU first as always). How are games scaling? All working? I have some HD6xxx cads and i know that some games won't work with those, but we are talking about old dx11 only cards.
No useful comments? You have a bunch of ppl telling you that it just doesnt work most of the time anymore and you simply do not want to accept that. You can try older drivers if you want and you might get a few older games to work but unless all you want to do is play older games with some old GPUs then you're wasting your time. CrossFire and SLI are dead technologies now. You can do multi GPU for other things and there may be a small handful of newer games that support it to some extent but 90% of the time it isn't going to work because it's not supported anymore and there is no fix for that.

There are few DX11 games that would need more than one GPU to run smooth at ultra high settings and Microsoft left multi-GPU support up to the devs and did not include strong base support for it in DX12 and it has thus mostly died off.

Multi-GPU is inefficient since the Vram doesn't stack. Having two 4GB GPUs means you have two GPUs running off 4GBs. You will quickly run out of Vram before you would be able to see a benifit from having more GPU power in any newer game. Technically DX12 allows for the Vram to stack but to date there is only one game that does this (Ashes of the Singularity) but that game is different because it's known more as a DX12 tech demo than a game. There is no way to get the Vram to stack in any other game, and any newer game would need more Vram to benifit much from more GPU power than what a something like a 7990 offers.

That said, I think it might work in BF5. Try that.

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Last edited by UltraMega; 07-30-2019 at 12:56 AM.
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