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[Youtube] PCIe 16x vs 8x vs 4x With HD 6990 - Page 4

post #31 of 34
Quote:
Originally Posted by WorldExclusive;13107035 
+1

Benchmarks are not efficient ways to test how a video card will perform during actual gaming. I've seen people get high scores in benches and their video card runs like crap in certain games. Their OC is fine during 3dVantage and crashes during actual gaming.

All the testing done at HardOCP linked above was done with real world gameplay. Very interesting results. Convinced me to not worry about NF200 chipsets in my next build.
post #32 of 34
Hmmm why is there even 4x maken no sense
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post #33 of 34
Quote:
Originally Posted by PoopaScoopa View Post
Both GPUs on the 6990 were running at x8/x8 when in x8 PCIe slots? Shouldn't they both be at x4/x4 ?
Whether or not a dual gpu card internally splits up the available pciex bandwidth in half like that I am not sure. Personally I don't think it works that way but regardless, the only thing we can monitor is what speed the link is running at for each specific video card.

On my evga x58 classified 760 motherboard there are 4 pciex slots. If only slot 1 or 3 are occupied, and the devices can do it, both cards both individually run at x16. This is what I did for the x16 x16 tests.

If slot 2 and 4 are occupied, all four slots drop to a maximum of x8 speed. So for the x8 x8 tests I moved both 6990's to slot 2 and 4. Everest showed that both cards were indeed running at x8 speed. GPU-Z though still showed that both cards were in x16 x16 mode. This must of been because the bridge chip that links the gpu's on each single card is an x16 link between them and for some reason thats what gpu-z reading instead.
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post #34 of 34
Quote:
Originally Posted by Cmdr.Shephard View Post
Hmmm why is there even 4x maken no sense
In a way I have to agree. I understand that devices such as sound cards, raid controllers or pciex ssd's only need x1 or x4 bandwidth to operate properly, but it's not like if you use an x4 device in an x8 slot that the unused lanes can be made available for other devices. I would like to see the nex gen platform to do just that. I know pciex 3.0 is coming which doubles the bandwidth of 2.0 so I guess it wont matter much until the next gen platform has been out for several years and video cards are improved enough to actually saturate the new massive amount of available bandwidth 3.0 provides.
Edited by ]\/[EGADET]-[ - 4/13/11 at 7:31am
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