does the "vram stack" in crossfire?

[NeymarX]

it doesnt in sli does it?? so if i buy 2 x 390x cards will the vram stack to 16 gig? cheers

 

[WildCard999]

No as of now neither SLI or CF will stack vram, it may change once DX12 is released.

 

[Onefurrybanana]

No if you run they will go off the lower cards vram. So one card with 8 and one with 4 would limit them both to 4. There is a rumor that in dx12 that vram will stack but i wouldn't get my hopes up for a rumor. Also the most vram i have used is just over 8gb which was on gta V modded at 4k with max settings lol

 

[Grimwinder]

No, you'll be effectively limited to the size of the smallest card's vram, because both cards have to process the same image to display, and thus will both be limited to the smaller vram amount (so if you use a 2gb and a 4gb they will both be using 2gb to process the same image with the same specs, otherwise you'd get a confused mess on your monitor as the images swapped).

 

[faalin]

As of right now no it does not, supposedly in Dx12 it will stack and there were talks that you could pair AMD and Nvidia cards together. Until cards and games fully support Dx12 i treat everything as hear say as it can all change at a moments notice.

 

[striker_gt]

No, you'll be effectively limited to the size of the smallest card's vram, because both cards have to process the same image to display, and thus will both be limited to the smaller vram amount (so if you use a 2gb and a 4gb they will both be using 2gb to process the same image with the same specs, otherwise you'd get a confused mess on your monitor as the images swapped).

Not true. I have an RADEON HD 8950 2GB and 7770 1GB in crossfire and GTA V shows 2 Gigs of VRAM. Also in other games such as BF4 and BF3, Ghost Recon Phantoms, etc.. see 2 gigs of VRAM in Crossfire..

 

[lucas_7_94]

No, you'll be effectively limited to the size of the smallest card's vram, because both cards have to process the same image to display, and thus will both be limited to the smaller vram amount (so if you use a 2gb and a 4gb they will both be using 2gb to process the same image with the same specs, otherwise you'd get a confused mess on your monitor as the images swapped).

Not true. I have an RADEON HD 8950 2GB and 7770 1GB in crossfire and GTA V shows 2 Gigs of VRAM. Also in other games such as BF4 and BF3, Ghost Recon Phantoms, etc.. see 2 gigs of VRAM in Crossfire..

If its true, well, the games should show 3GB instead of 2GB.

And, its thread is old, and its true , Dx12 seems to allow the 'stack vram', in special new Pascal/Polaris cards.

 

[striker_gt]

My cards support DX12, but looks like memory stack doesn't work in all games (as well as crossfire).

http://www.amd.com/en-us/innovations/software-technologies/directx12

It looks like video memory stacking could work under mantle, for example, BF4, but it's not confirmed:

http://wccftech.com/geforce-radeon-gpus-utilizing-mantle-directx-12-level-api-combine-video-memory/

"I think I should make it clear hear that just because you are running Windows 10 and DX12 and/or Mantle API does not mean that your multiple GPU configuration is now stacking memory. The capability is present in these low overhead APIs but they will not come into affect until devs specifically optimize the game as such. No optimization would still equal the usual no-stacking scenario. Optimization has always been pretty poor on PC titles due to the immense amount of raw horsepower that the platform offers, but this new development can usher in a sought-after era of optimization (of PC Games) and it will be about damn time."

But some says the opposite:

https://steamcommunity.com/app/271590/discussions/0/611703999963524910/#p2

I have a ASUS R9 280 3 GB too and it works better than my 8760-7770 crossfire (2+1 GB)...

 

[striker_gt]

No, you'll be effectively limited to the size of the smallest card's vram, because both cards have to process the same image to display, and thus will both be limited to the smaller vram amount (so if you use a 2gb and a 4gb they will both be using 2gb to process the same image with the same specs, otherwise you'd get a confused mess on your monitor as the images swapped).

Not true. I have an RADEON HD 8950 2GB and 7770 1GB in crossfire and GTA V shows 2 Gigs of VRAM. Also in other games such as BF4 and BF3, Ghost Recon Phantoms, etc.. see 2 gigs of VRAM in Crossfire..

If its true, well, the games should show 3GB instead of 2GB.

And, its thread is old, and its true , Dx12 seems to allow the 'stack vram', in special new Pascal/Polaris cards.

Looks like we have to wait for game developers to fully support the crossfire vram stack.

 

[striker_gt]

No, you'll be effectively limited to the size of the smallest card's vram, because both cards have to process the same image to display, and thus will both be limited to the smaller vram amount (so if you use a 2gb and a 4gb they will both be using 2gb to process the same image with the same specs, otherwise you'd get a confused mess on your monitor as the images swapped).

Not true. I have an RADEON HD 8950 2GB and 7770 1GB in crossfire and GTA V shows 2 Gigs of VRAM. Also in other games such as BF4 and BF3, Ghost Recon Phantoms, etc.. see 2 gigs of VRAM in Crossfire..

If its true, well, the games should show 3GB instead of 2GB.

And, its thread is old, and its true , Dx12 seems to allow the 'stack vram', in special new Pascal/Polaris cards.

Ok, after lots of config and last driver installation, I did not achieve to stack vram in GTA V, but configuring AFR MODE in Crossfire I got a better crossfire performance. (My crossfire is between RADEON HD 8760 2gb and 7770 1gb).

In games like BF4 mantle works very well and give more fps punch.