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[TPU] Fury X PCI-Express Scaling

post #1 of 43
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Quote:
There is no significant performance difference between x16 3.0 and x8 3.0 (and x16 2.0, which offers the same bandwidth). The average difference is only 1%, which you'd never notice. Even a bandwidth-restricted scenario, such as x16 1.1 or x8 2.0 offered by seriously old motherboards, only saw a small difference of around 4%. The same goes for x4 3.0, which is the bandwidth offered by the x4 slots on some recent motherboards. On recent platforms, the third x4 slot is usually wired through the chipset, which incurs an additional performance penalty that is definitely measurable and amounts to an additional 1%, but the difference is surprisingly small, much smaller than claims on the Internet talking about "crippled performance".

SOURCE



As many could have guessed, almost no performance difference between PCI -E v2.0 and v3.0
post #2 of 43
I need the double x16 PCI 3.0 for my quadruple SLI-CF though that I plan on getting in 5 years (currently broke, spent too much on the motherboard).
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post #3 of 43
What about 4K?

Edit: Wow even 4K no difference. So PCIE 4.0 is really pointless right now. X99 is pointless having 40 lanes. 5820K is perfect.
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post #4 of 43
i was just thinking about adding an additional 7950 to my wifes rig ( 8350 on an m5a97 r2.0 mobo ) which has a 16x and a 4x pcie 2.0. good to see that shouldn't be an issue give or take 5-10%
post #5 of 43
Quote:
Originally Posted by ZealotKi11er View Post

What about 4K?

Edit: Wow even 4K no difference. So PCIE 4.0 is really pointless right now. X99 is pointless having 40 lanes. 5820K is perfect.

PCI-e is used to communicate between components in the system. For heavier loads, less time is spent communicating and more time is spent processing the data that needs to be sent out. In a sense, PCI-e bottlenecking occurs when it matters the least - when workloads on the GPU are low.

Quote:
Contrary to intuition, the driving factor for PCI-Express bus width and speed for most games is the framerate, not resolution, and our benchmarks conclusively show that the performance difference between PCIe configurations shrinks at higher resolutions.

Quote:
Originally Posted by agooz20 View Post

i was just thinking about adding an additional 7950 to my wifes rig ( 8350 on an m5a97 r2.0 mobo ) which has a 16x and a 4x pcie 2.0. good to see that shouldn't be an issue give or take 5-10%
It might actually be a minor issue. SLI/CF require a lot of communication over the bus. The memory in both cards needs to match up and that data is sent over PCI-e.
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post #6 of 43
"Almost" no difference, and only a single card.

How about 2, 3, or 4-way crossfire?
post #7 of 43
Is folding or bitcoin mining affected?
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post #8 of 43
Quote:
Originally Posted by 47 Knucklehead View Post

"Almost" no difference, and only a single card.

How about 2, 3, or 4-way crossfire?

This... CPU -> GPU communication isn't the issue, CPU -> GPU + GPU -> GPU combined communications are the issue.
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post #9 of 43
Interesting. I really like PCIE tests, because I am still on 2.0 aswell smile.gif
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post #10 of 43
With a single card you won't face the PCIE limitation...The test should be between 16x/16x on X99 vs. 8x/8x on Z170, or 8x/8x/8x/8x on X99 without PLX vs 16x/16x/16x/16x with PLX...
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