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[TPU] Ivy Bridge PCI-Express Scaling with HD 7970 and GTX 680

post #1 of 20
5/7/12 at 3:27am
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The last time we did an article on PCI-Express scaling, was when graphics cards were finally able to saturate the bandwidth of PCI-Express x16. Not only was it a time when PCI-Express 2.0 was prevalent, but also when the first DirectX 11 GPU hit the market, and that was over six years into the introduction of the PCI-Express bus interface. Since 2009, thanks to fierce competition between NVIDIA and AMD, GPU performance levels have risen at a faster rate than ever, and the latest generation of high-end GPUs launched by the two GPU rivals adds support for the new PCI-Express 3.0 interface. The new interface sprung new questions from users like "Do I need a new motherboard to run a PCI-Express 3.0 card?", "Will my new PCI-Express 3.0 card be much slower on an older motherboard?" or "My motherboard supports only x8 for multiple cards, will performance suck?"

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post #2 of 20
5/7/12 at 3:34am
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Interesting to see how little even pcie 1.1 4x actually bottlenecks. I also now get to rub this in the faces of the stupid people that keep telling me pcie3 is a must have because 2.0 is such a bottleneck. biggrin.gif
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post #3 of 20
5/7/12 at 3:37am
Wish they would do x1 for 1.1 and 2.0 smile.gif I have eGPU and until we get thunderbolt 2.0 x1 is the highest we get atm.
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post #4 of 20
5/7/12 at 3:46am
Quote:
Originally Posted by G3RG View Post

Interesting to see how little even pcie 1.1 4x actually bottlenecks. I also now get to rub this in the faces of the stupid people that keep telling me pcie3 is a must have because 2.0 is such a bottleneck. biggrin.gif

No one in their right mind has ever said PCI-E 2.0 was a bottleneck with a single GPU that this article tests. You only start to see bottlenecks when you are running 3-4 GPU's in high-resolution Surround monitor config's and when slots get kicked down to 8x.

Single GPU you are fine with PCI-E 2.0, always have been. This article doesn't test anything that I mention above that would actually stress the PCI-E bus.
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post #5 of 20
5/7/12 at 4:02am
Quote:
Originally Posted by CallsignVega View Post

No one in their right mind has ever said PCI-E 2.0 was a bottleneck with a single GPU that this article tests. You only start to see bottlenecks when you are running 3-4 GPU's in high-resolution Surround monitor config's and when slots get kicked down to 8x.
Single GPU you are fine with PCI-E 2.0, always have been. This article doesn't test anything that I mention above that would actually stress the PCI-E bus.

this i wish they would have tested multi gpu setups and see what the hit was across the board there
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post #6 of 20
5/7/12 at 4:14am
Sets my mind at ease a little (everyone always said it amounted to nothing but this helps). My GTX 680 was buggin out until I tried setting it to PCI-e 2.0, now its fine. Weird bug but its all cool.
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post #7 of 20
5/7/12 at 4:22am
I had to put my brothers HD 6850 in a PCIe 2.0 x4 slot because the sound card would only fit into the x16 slot without blocking airflow to the graphics card. This puts my mind at ease, I was worried I'd severely bottlenecked his rig. smile.gif
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post #8 of 20
5/7/12 at 4:26am
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I'd like to see the same testing on an AMD system where the PCI-e data still has to take a ride thru the system bus.
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post #9 of 20
5/7/12 at 4:40am
Of course a single card won't bottleneck...Now add in a second and third card and watch the bottlenecks appear. This is like testing CPUs using some benchmark based around late 90s code like SuperPi, and trying to say it applies to anything but benchers.
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post #10 of 20
5/7/12 at 4:47am
we already knew this
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