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Does Dual GPU Cards Have Half Their Advertised Memory

post #1 of 5
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Is their effective vram on dual cards like 560x2, 590 or 6990 have half of their advertised memory in game? For example, is a 3 gig card like the gtx 590 really just 1.5 in game? Thus if I require a card that needs 1.2 gig vram, a 560tix2 dual gpu card will not do because its 2gig is really just 1gig vram in game?

Cheers
post #2 of 5
I'm pretty sure both GPUs are using the same memory so you would have all 3 gigs on a GTX 590. Sli and Crossfire dont have the memory on the same card so both cards memory has to store the same thing.

Edit: never mind after looking around the internet it seems 590 has 1.5 usable.
Edited by UbNub - 11/5/11 at 11:43am
    
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post #3 of 5
No, they like to combine the number to make it sound "bigger, stronger, and faster than before". A 3GB GTX 590 has 1.5GB per GPU, a 4GB 6990 has 2GB per GPU. The Vram is mirrored in an SLI/CF setup because both are doing the same work, but calling it a 2GB or whatever makes it sound slow to the average joe who doesn't even know anything other than bigger numbers are better.

All of the dual GPU cards are essentially CF/SLI without the motherboard in between.
post #4 of 5
Quote:
Originally Posted by Scorpion49 View Post
No, they like to combine the number to make it sound "bigger, stronger, and faster than before". A 3GB GTX 590 has 1.5GB per GPU, a 4GB 6990 has 2GB per GPU. The Vram is mirrored in an SLI/CF setup because both are doing the same work, but calling it a 2GB or whatever makes it sound slow to the average joe who doesn't even know anything other than bigger numbers are better.

All of the dual GPU cards are essentially CF/SLI without the motherboard in between.
Bingo!

Like Scorpion49 said, the ram is all on one board, but 1/2 is allocated to one GPU, and 1/2 is allocated to the other. I have the 5970 (5870 dual GPU at 5850 core speeds) with 2Gb vRAM. When I run eyefinity, more ram is better for fram buffering. But the ram is not combined, I only have 1Gb usable ram for the 5970 to utilize.
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post #5 of 5
Second that - no stacking on Dual GPU and/or Xfire/SLI.
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