ELmo1989

I recently seen a quad crossfire with 4 cards.
Wonder if this possiable for SLI?

Will be build a rig to test XAA / XAF with High resolution.
(Also to show how much video memory you really need these days).

Would like 2GB OF Vram for about 400$.
So Right 2 SLI Cards
or 4 CRossfire cards

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Spazghost

Most I have seen for SLI is tri SLI on the 780i boards. I don't think you can do more than 3 cards in SLI

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ELmo1989

Thanks for the fast post.
That what I think but I want to check.

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Spazghost

No problem. I think the closest to 'quad' sli you can get is using 2 of the newer 2 GPU cards in SLI. It's not really quad sli as in 4 cards, but it is 4 gpus.

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mnishimura00

nope.. the closest thing to quad sli is 2x 9800gx2s.

maybe sometime in the future, they will implement real quad sli. its bad enough they have horrible drivers for two way sli.

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Manyak

You can use quad SLI on any board that supports it - and the only one I know of that does is the Skulltrail.

And vRAM doesn't work the way you are thinking of. You can't just buy 4x 512MB cards and add them together - that still comes out to only 512MB, as all the cards keep their memory banks identical.

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NITRO1250

Technically if you get dual 9800 GX2s it would be quad SLI as each card has 2 GPU's in it, much like the old ASUS 7800 card from the past. People were calling it quad SLI.

Personally, I'd get 3 GTX 280s if you really want to test something.

ELmo1989

I know.
Really I want just want a cheap 2GB of vram.
So I think
1 Card with 2GB
2 Cards with 1GB
4 Cards with 512MB

Edit just read Manyak post.
Thank you.

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Manyak

Like I said earlier, vRAM doesn't work like that.

If you get 4 cards with 512MB of ram, that's still only 512MB of effective RAM - its just 4 copies of the same content kept in sync between all the cards.

Even the one card with 2GB of ram - the 4870x2 - is really only two identical copies of 1GB.

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Spazghost

I think the idea behind vRAM not adding up is the streamline the processing of the data, rather than add everything together into one big beast card.

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