8GB Sapphire Radeon R9 290X TOXIC

#4949191 Posted on: 10/31/2014 10:15 AM

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Yup, which is why my GPU that says 8GB vRAM on the box, is actually lying

#4949299 Posted on: 10/31/2014 01:46 PM

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Even if you have 12gb videocard skyrim will get it on it´s knee´s like an arrow

Skyrim is not made for 4k textures and enb it's all a hacked way(boris "ENB"Voronsov) to make it posible, but it will never be smooth ride with skyrim.

It will how ever looks great for a DX9 because of awesome mods and ENB.

Better hope next installment Elder Scroll VI will need more use of new tech in DX12?

Or next years The Witcher 3 DX11?

#4949769 Posted on: 11/01/2014 02:58 AM

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I don`t think you quite understand how AFR and SFR work. With AFR, which is the most common form of multi-GPU rendering, you`re absolutely correct. But with SFR, this is not the case.

With alternate frame rendering, you must render an entire screen sized frame within the VRAM of each card. As soon as card 1 is finished, it proceeds to flush its memory and start rendering the frame after card 2, and card 2 finishes its rendering of an entire screen size frame, etc. With split frame rendering, each card is rendering part of the frame, eg. with 2 cards, card 1 might rendering the top half of a frame, and card 2 might render the bottom half of the frame. In other words, you do not need to duplicate the contents of card 1 with card 2. Since card 2 can have entirely different data from card 1, it in effect means you can add the video memory together to create a virtual address space that is twice as large as the video memory of one card, duplicated.

In the case of 3 video cards, each card could render one third of the screen frame, etc.

#4949773 Posted on: 11/01/2014 03:09 AM

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Split frame render isn't even an option anymore in the NVCP it gave a tremendous performance decrease vs AFR.

#4949775 Posted on: 11/01/2014 03:10 AM

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I don`t think you quite understand how AFR and SFR work. With AFR, which is the most common form of multi-GPU rendering, you`re absolutely correct. But with SFR, this is not the case.

With alternate frame rendering, you must render an entire screen sized frame within the VRAM of each card. As soon as card 1 is finished, it proceeds to flush its memory and start rendering the frame after card 2, and card 2 finishes its rendering of an entire screen size frame, etc. With split frame rendering, each card is rendering part of the frame, eg. with 2 cards, card 1 might rendering the top half of a frame, and card 2 might render the bottom half of the frame. In other words, you do not need to duplicate the contents of card 1 with card 2. Since card 2 can have entirely different data from card 1, it in effect means you can add the video memory together to create a virtual address space that is twice as large as the video memory of one card, duplicated.

In the case of 3 video cards, each card could render one third of the screen frame, etc.

That sounds about right. Weren't SLi and crossfire originally SFR-only? In a resources and mathematical perspective, SFR is definitely more efficient. But in terms of actual performance, it can be a problem since the GPUs might not finish their tasks on time. I figure that as long as vsync is on and the GPUs (collectively) can operate at a frame rate higher than your screen's refresh rate, SFR would probably work great. I get the impression AMD has abandoned SFR entirely though, since I think that's where the hardware bridge really came in handy (and they're now ditching it).