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Assassin

Dual GPU cards may finally be able to combine their VRAM.

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Posted · Original PosterOP

On a recent tweet by an AMD representative Robert Hallock, it has been confirmed that dual GPU cards are now finally able to double their VRAM with proper optimization and support using low level APIs such as mantle and possibly DX 12.

 

Here is the tweet:

https://twitter.com/Thracks/status/561708827662245888

 

 

Here is an article that goes into more detail. 

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

 

One of the more interesting features of multiple GPU configuration is how the system itself works. The reason why there is no memory stacking effect is because a complete copy of the game has to be run in each GPU, and frames are alternated between whatever number of cards you have. However, with low level APIs like Mantle having now entered the scene, the developer is granted the coveted ‘to-the-metal’ access to the GPU. That means, that with the proper optimization developers can now surpass the limitation of the old soft architecture and enable buffer stacking. 

Ultimately the point is that gamers believe that two 4GB cards can’t possibly give you the 8GB of useful memory. That may have been true for the last 25 years of PC gaming, but thats not true with Mantle and its not true with the low overhead APIs that follow in Mantle’s footsteps.

 

So there you go guys. This is really exciting and hopefully will see more support in the future. 


The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

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Nice, looking forward to the 300 series... I'm going to need to get a job, #broke


CPU: i5-4690k GPU: 280x Toxic PSU: Coolermaster V750 Motherboard: Z97X-SOC RAM: Ripjaws 1x8 1600mhz Case: Corsair 750D HDD: WD Blue 1TB

How to Build A PC|Windows 10 Review Follow the CoC and don't be a scrub~soaringchicken

 

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Finally people can stop whinning about it. 

OT: nice to see the optimizations, don't know how it'll work with DX12 though.


Computing enthusiast. 
I use to be able to input a cheat code now I've got to input a credit card - Total Biscuit
 

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i always wondered why they havent done this before. i mean it just turning it into a shared memory pool rather then 2 duplicated sets. the obliviously a lot of harder things to overcome. but strange its never been done before.

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Now you ACTUALLY be able to have 8GB of VRAM!

OR 16GB OF MOTHERFUCKING VRAM WITH TWO 8GB CARDS!


My arsenal: X99 Xeon Gaming Rig, 13" 2014 Retina MacBook Pro, 128GB iPhone 6+, iPad Air 2, Nikon D3200, Knowledge.

 

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I wonder if we'll get ads now that say "4GB means 8GB. No, really."


CPU: Intel Core i7-5820K - Motherboard: EVGA X99 FTW K - RAM: CORSAIR Vengeance LPX 16GB (4 x 4GB) - GPU: EVGA GTX 970 SuperSC ACX 2.0+
Case: NZXT Phantom 530 - Storage: 2x WD 1TB HDD - 1x 120GB Kingston HyperX 3K SSD - PSU: Corsair RM750 - Cooling: NZXT Kraken x61

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My guess is this has something to do with how Mantle crossfire works.

 

In Beyond Earth mantle crossfire uses a different rendering technique than AFR (I believe it's similar to SuperTiling described here http://techreport.com/review/8826/ati-crossfire-dual-graphics-solution/3) and I suspect that if you do this properly it may be possible to not require both cards to have the same framebuffer contents.  The reason it typically isn't used is that it's more complicated to implement, but maybe Mantle/DX12 remove enough overhead on drawcalls to make it feasible instead of AFR.  


4K // R5 3600 // RTX2080Ti

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muh specs 

Gaming and HTPC (reparations)- ASUS 1080, MSI X99A SLI Plus, 5820k- 4.5GHz @ 1.25v, asetek based 360mm AIO, RM 1000x, 16GB memory, 750D with front USB 2.0 replaced with 3.0  ports, 2 250GB 850 EVOs in Raid 0 (why not, only has games on it), some hard drives

Screens- Acer preditor XB241H (1080p, 144Hz Gsync), LG 1080p ultrawide, (all mounted) directly wired to TV in other room

Stuff- k70 with reds, steel series rival, g13, full desk covering mouse mat

All parts black

Workstation(desk)- 3770k, 970 reference, 16GB of some crucial memory, a motherboard of some kind I don't remember, Micomsoft SC-512N1-L/DVI, CM Storm Trooper (It's got a handle, can you handle that?), 240mm Asetek based AIO, Crucial M550 256GB (upgrade soon), some hard drives, disc drives, and hot swap bays

Screens- 3  ASUS VN248H-P IPS 1080p screens mounted on a stand, some old tv on the wall above it. 

Stuff- Epicgear defiant (solderless swappable switches), g600, moutned mic and other stuff. 

Laptop docking area- 2 1440p korean monitors mounted, one AHVA matte, one samsung PLS gloss (very annoying, yes). Trashy Razer blackwidow chroma...I mean like the J key doesn't click anymore. I got a model M i use on it to, but its time for a new keyboard. Some edgy Utechsmart mouse similar to g600. Hooked to laptop dock for both of my dell precision laptops. (not only docking area)

Shelf- i7-2600 non-k (has vt-d), 380t, some ASUS sandy itx board, intel quad nic. Currently hosts shared files, setting up as pfsense box in VM. Also acts as spare gaming PC with a 580 or whatever someone brings. Hooked into laptop dock area via usb switch

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OR 16GB OF MOTHERFUCKING VRAM WITH TWO 8GB CARDS!

We're going to end up with 64GB VRAM configs....

 

Now only if the GPU Cores could actually handle something that used that much or if there were only games that used up that much...

 

I think we're set when we add another zero to common HDD Sizes.

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My guess is this has something to do with how Mantle crossfire works.

 

In Beyond Earth mantle crossfire uses a different rendering technique than AFR (I believe it's similar to SuperTiling described here http://techreport.com/review/8826/ati-crossfire-dual-graphics-solution/3) and I suspect that if you do this properly it may be possible to not require both cards to have the same framebuffer contents.  The reason it typically isn't used is that it's more complicated to implement, but maybe Mantle/DX12 remove enough overhead on drawcalls to make it feasible instead of AFR.  

I really prefer and have a better experience with AFR. 


muh specs 

Gaming and HTPC (reparations)- ASUS 1080, MSI X99A SLI Plus, 5820k- 4.5GHz @ 1.25v, asetek based 360mm AIO, RM 1000x, 16GB memory, 750D with front USB 2.0 replaced with 3.0  ports, 2 250GB 850 EVOs in Raid 0 (why not, only has games on it), some hard drives

Screens- Acer preditor XB241H (1080p, 144Hz Gsync), LG 1080p ultrawide, (all mounted) directly wired to TV in other room

Stuff- k70 with reds, steel series rival, g13, full desk covering mouse mat

All parts black

Workstation(desk)- 3770k, 970 reference, 16GB of some crucial memory, a motherboard of some kind I don't remember, Micomsoft SC-512N1-L/DVI, CM Storm Trooper (It's got a handle, can you handle that?), 240mm Asetek based AIO, Crucial M550 256GB (upgrade soon), some hard drives, disc drives, and hot swap bays

Screens- 3  ASUS VN248H-P IPS 1080p screens mounted on a stand, some old tv on the wall above it. 

Stuff- Epicgear defiant (solderless swappable switches), g600, moutned mic and other stuff. 

Laptop docking area- 2 1440p korean monitors mounted, one AHVA matte, one samsung PLS gloss (very annoying, yes). Trashy Razer blackwidow chroma...I mean like the J key doesn't click anymore. I got a model M i use on it to, but its time for a new keyboard. Some edgy Utechsmart mouse similar to g600. Hooked to laptop dock for both of my dell precision laptops. (not only docking area)

Shelf- i7-2600 non-k (has vt-d), 380t, some ASUS sandy itx board, intel quad nic. Currently hosts shared files, setting up as pfsense box in VM. Also acts as spare gaming PC with a 580 or whatever someone brings. Hooked into laptop dock area via usb switch

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I think this should be pointed out from the article:

 

"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."

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Posted · Original PosterOP

OR 16GB OF MOTHERFUCKING VRAM WITH TWO 8GB CARDS!

Or 24GB with Titan Z sli. 


The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

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Posted · Original PosterOP

I think this should be pointed out from the article:

 

"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."

I will add that in. Thanks!


The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

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I really prefer and have a better experience with AFR. 

 

It works really good in Beyond Earth.  Mantle crossfire has generally been pretty shitty, but I was impressed there.  

 

Didn't use Mantle in anything else though.  Crossfire support was non-existant or shitty (thief) in mantle titles.


4K // R5 3600 // RTX2080Ti

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Dammit.. I just changed into these pants....


Maximums - Asus Z97-K /w i5 4690 Bclk @106.9Mhz * x39 = 4.17Ghz, 8GB of 2600Mhz DDR3,.. Gigabyte GTX970 G1-Gaming @ 1550Mhz

 

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Most likely going to upgrade my rig with Broadwell-E or Skylake (not sure which one, ideas?) to try to make a more "future proof" machine.

 

I'm just an Nvidia fanboy, but I'm concerned I might have to fall in love with AMDs 3XX cards, and it had me concerned.


Case: Zalman Z11 Plus | CPU: AMD FX-8320 Black Edition (4.2GHz) | CPU Cooler: Corsair H80i w/ x2 Noctua NF-F12 | Motherboard: Gigabyte 990fx-UD3 | RAM: G.SKILL 1333MHz (8GB) | Video Card: Evga GTX 770 2GB | SSD: Samsung 840 EVO (x1 250GB & x1 500GB) | HDD: 1TB Seagate SATA III | PSU: CM Silent Pro M2 850W | Headset: Sennheiser HD 598 | Mic: Blue Yeti | Mouse: Logitech G502 | Keyboard: Corsair K95 RGB Platinum | Monitor: 3x Asus VE278Q 27in

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