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How exactly does the GTX 590 work? - Page 2

post #11 of 18
I don't know EXACTLY, but I believe the NF200 was a chip designed to reduce the latency normally found in SLI/Xfire bridges and going over the PCI-e lanes...I could be dead wrong tongue.gif
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post #12 of 18
Thread Starter 
Quote:
Originally Posted by jellis142;12969679 
I don't know EXACTLY, but I believe the NF200 was a chip designed to reduce the latency normally found in SLI/Xfire bridges and going over the PCI-e lanes...I could be dead wrong tongue.gif
Ah, ok, thanks... smile.gif
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post #13 of 18
When you have a single card w/two GPU's the NF200 is a 'bridge' chip on the card that allows the two gpu's to work as though you had two cards in SLI ... even though both are on a single PCI-Ex slot.

So ... a 590 works just the same as if you had two cards in SLI, but your board doesn't have to support SLI for it to work because the SLI support is built into the card via the NF200 chip onboard.

An NF200 bridge chip can also be mounted on a motherboard to expand the total number of PCI-Ex 'lanes' available beyond that which is 'natively' supported by the board's chipset.

For example the p55/i5 chip and chipset (I believe) only have support 16 lanes (or is it 20?) of native PCI-Ex, which means it you wanted to run tri-SLI the most lanes you could have per card would be 4, or 4x/4x/4x. But there are some high-end p55 boards with an NF200 chip on them that expand the available lanes so that you can run tri-SLI at 8x/8x/8x even though you only have 16 lanes (or 20?)
    
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post #14 of 18
just like the voodoo5500
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post #15 of 18
And how does this work on an Intel P67 chipset board?

SLI means splitting the x16 PCIe lanes to x8 and x8. So that means when using two 590's in SLI, one 590 wil use x4 and x4 (=x8 in 1 PCIe slot)?

Will a x8 slot do for a GTX590?

confused.gif
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post #16 of 18
The difference in performance between x8 and x16 is miniscule. It's something like 5% difference.

EDIT: Sorry man, I misunderstood what you were saying. I'm not too sure if that will be the case.
Edited by frannyvox - 4/7/11 at 5:16am
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post #17 of 18
It's also worth noting that each GPU doesn't get x8 - both GPUs share x16. There is an important difference - when the GPUs share x16 they can both still burst at x16 rates, but if they're in their own x8 slots they only get x8 bandwidth maximum. As PCIe is full duplex you could have the situation where 1 GPU is transferring data to the card at x16 and the other other is transferring data away from the card at x16 simultaneously (although this is unlikely to happen often). This (can) result in much higher bandwidth being available to each card than if each were physically limited to an x8 slot each, although the slight overhead involved can also hurt performance.
post #18 of 18
Quad-SLI with 2 x 590's would be a ridiculous and silly setup.

You're talking about the processing power of 4 GTX580 cores (minus the clock speed) ... coupled with the effective vram amount of only 1 GTX580 headscratch.gif

By the time you create a scenario (like running Metro on 3 large monitors) that you would actually benefit from all that processing power, you are going to be totally crapping out on vram.

That's not to mention the fact that there's no CPU that can keep up with that much GPU power, so bottlenecking would be inevitable.

If you're contemplating 590's in SLI ... don't. If you wanna do something over the top, go with 3 x 580 3GB models. Or 2 x 6990's.

Quad-SLI 590's is hella dumb.
    
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