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GTX 680 PCI-E 2.0 and 3.0 - Page 3

post #21 of 31
Quote:
Originally Posted by fasti View Post

7970 benchmark over different bandwidths: http://www.anandtech.com/show/5458/the-radeon-hd-7970-reprise-pcie-bandwidth-overclocking-and-msaa/1 No idea about what motherboard they used...
Result: PCI-E 2.0 16x is still enough. At least for single gpu(?)

Omg, I hope that article is right, such a relief. From the looks of the article, as long as you have PCI-E 2.0 x16 you should be ok with a 7970, and hopefully a GTX 680. My mobo has 3 PCI-E 2.0 (16x8x8x or 16x16x1x). So basically I can only use two of the three PCI-E 2.0 slots at full potential with a 7970, and hopefully a GTX 680, since a 680 is what I want. thumb.gif
post #22 of 31
Quote:
Originally Posted by Cyrilmak View Post

Today's dual GPU's don't even use more than half of PCI-Express 2.0 bandwidth yet.

enough said thumb.gif
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post #23 of 31
Quote:

Yes it does. Those comparisons are just showing that there is no difference between the PCIE 2.0 and 3.0 when you use the GTX 680.
post #24 of 31
Quote:
Originally Posted by G3RG View Post

Xfire has historically (and currently) scaled better than SLI. 7970 Crossfire actually beats 680 sli due to scaling.

first, even if xfire scales better that does mean sli scales bad, which is what you stated.

second, it was not until recently that crossfire started to scale better than sli

third, proof of 7970 crossfire beating 680 sli? because it scales pretty damn well http://www.guru3d.com/article/geforce-gtx-680-sli-review/15
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post #25 of 31
PCIe 2.0 and PCIe 3.0 just determines the bandwidth between the system and the GPUs - this means loading textures to the GPUs, not the computation of stuff on the GPU. If the GPU has all the textures required in memory, it doesn't have to load anything from the system, thus doesn't matter what PCIe version.

Now that GPU memory space is so big (2GB/3GB), even with high def textures you'll have trouble stressing PCIe 2.0 x16.
post #26 of 31
Quote:
Originally Posted by Blindsay View Post

first, even if xfire scales better that does mean sli scales bad, which is what you stated.
second, it was not until recently that crossfire started to scale better than sli
third, proof of 7970 crossfire beating 680 sli? because it scales pretty damn well http://www.guru3d.com/article/geforce-gtx-680-sli-review/15

http://nl.hardware.info/reviews/2506/19/amd-radeon-hd-7970-quad-crossfirex-eyefinity-review-schaling
http://nl.hardware.info/reviews/2641/12/nvidia-geforce-gtx-680-quad-sli-review-english-version-sli-scaling

That's with release AMD drivers.
 
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post #27 of 31

soo they are 2 seperate reviews and the amd one is only relative % and not actually numbers, yeah that totally proves a pair of 7970s are better rolleyes.gif

and even with your data they still say "However, on the highest settings nVidia scored a little better, 88 percent compared to 84 percent"
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post #28 of 31
I don't expect there to be much bottlenecking with an FX-8120. I am running an AMD system currently, how will that perform with a GTX680, because I was thinking about getting rid of my HD 6870 and upgrading.
post #29 of 31
Quote:
Originally Posted by LukaTCE View Post

This is useless pci-e 3.0 is only supported by Ivy bridge
Quote:

I think you'll find it does and you don't need IB:

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post #30 of 31
Quote:
Originally Posted by borandi View Post

PCIe 2.0 and PCIe 3.0 just determines the bandwidth between the system and the GPUs - this means loading textures to the GPUs, not the computation of stuff on the GPU. If the GPU has all the textures required in memory, it doesn't have to load anything from the system, thus doesn't matter what PCIe version.
Now that GPU memory space is so big (2GB/3GB), even with high def textures you'll have trouble stressing PCIe 2.0 x16.

In multi-GPU setups, the entire frames of alternate frame rendering are sent over the PCI-E bus at high speed. That is a lot of traffic, especially when you get into three and four GPU configurations.
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