Quote:
Originally Posted by Flyby
seems inefficient. I wonder if SoW will benefit from a single card with 2mb of ram versus two separate cards with 1mb each? I'd better read up on how SLi and Crossfire work. maybe the ram is shared as in a series circuit?
FLyby out
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VRAM is not shared. Each GPU needs its own VRAM to load information. In SLI and CF, you get two GPU (doubled computing power). That's the advantage.
There are two ways to work:
- SFR (split frame rendering): Each GPU renders half frame (frame generated in half time than with one only GPU).
- AFR (alternate frame rendering): Each GPU renders a frame, and the next is being rendering by the other GPU (you get 2 frames in same time you got one only frame with one GPU).
In both ways, each GPU needs its VRAM to read/write and generate the new frame.
Of course, all is in theory. You don't get double of frames with SLI/CF. But in some games with decent drivers you can get upto 80% more (usually, the figure is near to 40-50% more).
I have got two dual GPU systems (SLI, Nvidia).