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post #1 of 30 (permalink) Old 05-26-2020, 04:24 AM - Thread Starter
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whatever happened to DX12 multi-GPU?

It seemed to work well with AMD cards in Deus Ex: Mankind Divided:
https://www.youtube.com/watch?time_c...ature=emb_logo

But is this only because AMD backed up Eidos in developing it?

Were there any other games that supported DX12 multi-gpu?
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post #2 of 30 (permalink) Old 05-26-2020, 04:59 AM
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The issue with Crossfire/SLI in was, that the game devs had to make it possible to work.
Then, AMD and NV had to make it possible to work as well, with a new driver.

DX12 multi-GPU differs from this, by putting all of the work on the game developer instead.

And you know, unless there is some very good reason to do so, game companies wont spend time (time = money) on a technology, thats going to see about 5% utilization with their customer base (5% is a VERY generous share of a dual-GPU systems).

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post #3 of 30 (permalink) Old 05-26-2020, 05:52 AM
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As far as I know TAA can't be enabled in sli/crossfire due to it using the information from the previous frame to downscale the next frame, and many modern games are using TAA as the performance hit is usually positive. Gone are the crysis 3 days of choosing your AA method.

AC:Oddesy is a good example of this, fps will be higher on low or medium AA than with AA off due to the temporal nature of the TAA, and seeing as we are late into console generation any extra performance would presumably be a must for a dev.

I run a tech shop so have come into contact with a lot of enthusiasts over the years, and from my experience at least, after Pascal (1080ti specifically) the amount of dual gpu systems I see has significantly reduced, almost to the point of non existence. Even myself. I had usually started with one mid range card I could afford when younger, then added another. I had dual HD 5770, dual GTX 560, dual GTX 660, dual GTX 760, ended up upgrading them to dual 780 strix, dual 980ti classys, then single 1080ti, then single 2080ti. ( you could plot a graph of how successful I have been financially in my life by using my current rigs gpu )

Then there's the sheer price of cards, I recently found a invoice for a client who purchased a 780ti off me in 2014, "Gigabyte GeForce GTX 780 Ti GHz Edition 3GB -- $599.00" That's AUD. The equivalent 2080ti today is $2249 AUD ( https://www.pccasegear.com/products/...gaming-oc-11gb ) That's a 275.5% increase from the top of the line GPU in 2014 to 2020. I would hazard a guess that dual GPU is completely priced out for more people then ever.

Due to all these factors I doubt its very profitable or even sensible for devs to support multi gpu, whether its via DX12 or otherwise.
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post #4 of 30 (permalink) Old 05-26-2020, 06:15 AM
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Multi-gpu is only really starting to make sense with 4K120Hz on the horizon & 8K TV capability...

I already use 4K60hz with Freesync & HDR and would have loved to try multi-gpu solutions but there is no support, so it's dead end. All I can do is try and get a second Vega 64 and go for Legacy Crossfire instead, but no new gpu's have support for multi-gpu or new games have profiles for crossfire for the older cards.

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post #5 of 30 (permalink) Old 05-29-2020, 04:41 AM
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Quote: Originally Posted by Gandyman View Post
AC:Oddesy is a good example of this, fps will be higher on low or medium AA than with AA off due to the temporal nature of the TAA, and seeing as we are late into console generation any extra performance would presumably be a must for a dev.
.
FYI, I know at least for the low setting (not 100% sure about medium), AC:Oddesy actually runs the game at a slightly lower resolution and upscales back up with some form of AA. Pretty random, but that's why FPS is higher on low (so either run high or turn it off).
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post #6 of 30 (permalink) Old 05-29-2020, 04:56 AM
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multi gpu is dead. Lazy devs killed it, they didnt want to be bothered adding support for it so now there are no games that support it aside from a few older ones.

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post #7 of 30 (permalink) Old 05-29-2020, 04:57 AM
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Quote: Originally Posted by 8051 View Post
It seemed to work well with AMD cards in Deus Ex: Mankind Divided:
https://www.youtube.com/watch?time_c...ature=emb_logo

But is this only because AMD backed up Eidos in developing it?

Were there any other games that supported DX12 multi-gpu?
Shadow of the TR worked great for me with sli 1080tis, but I hear it has problems with AMD.

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post #8 of 30 (permalink) Old 05-29-2020, 04:59 AM
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Quote: Originally Posted by 8051 View Post
It seemed to work well with AMD cards in Deus Ex: Mankind Divided:
https://www.youtube.com/watch?time_c...ature=emb_logo

But is this only because AMD backed up Eidos in developing it?

Were there any other games that supported DX12 multi-gpu?
I would ask about feasibility...

MultiGPU configurations meant for end-user few things:
a) Possibility of 80% increase of graphic performance on average.
b) Increased power draw, increased heat generation, need for extra cooling.

Or when the game was not supporting it, no benefit at all...

From my experience, the multiGPU solutions are not feasible for gamers, and even enthusiasts.

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post #9 of 30 (permalink) Old 05-29-2020, 06:31 AM
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Guys, haven't you heard of SLI CFR mode? It has a lot of potential if Nvidia actually put some effort into it. In this rendering mode the frame is cut into small blocks and odd blocks are rendered by one of the cards and even blocks by the second one. This way you get double the memory as only the blocks that needs to rendered by the card are stored in its RAM.
There are some games that don't even work in the normal SLI modes but work quite well in CFR mode.

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post #10 of 30 (permalink) Old 05-29-2020, 06:34 AM
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tl;dr


game devs are lazy bastards

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