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1 Copper

Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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Why put an x8 slot disguised as an x16? To sell the higher priced gfx cards I suppose. Seems shady. Does Dell sell a replacement board that fits the R8 with ACTUAL x16 slots? 

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4 Germanium

Re: Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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There's no replacement Dell board.  That's the way it was designed.  It's also the same design for the Aurora R7, R9, and R10.

Yes, x16 is theoretically twice as fast as x8. At PCIe 3.0, each lane is a little under 1,000 MB/s. So at x8 (3.0) you'd get maximum speeds a little under 8,000 MB/s, versus maximum speeds a little under 16,000 MB/s at x16 (3.0). In a real life scenario, I'm not sure it would make a large or even a noticeable difference in gaming performance.  The CPUs mostly are not going to be using that much bandwidth.  

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4 Beryllium

Re: Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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@r72019 is correct. You find the same Dell small print in R10 spec.  And x8 works just as well as x16.  Maybe some of the saved PCIe lanes are used by NVMe PCIe ssd?

“From a quick look, there is a little below a 1% performance difference in PCI-e 3.0 x16 and PCI-e 3.0 x8 slots. The difference is not even close to perceptible and should be ignored as inconsequential to users fretting over potential slot or lane limitations.”

 

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8 Xenon

Re: Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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X8 in PCI-e 1.0 PCI-e 2.x PCI-e 3.0


x1 250MB/s      500MB/s      985MB/s
x4 1000MB/s    2000MB/s    3940MB/s
x8 2000MB/s   4000MB/s     7880MB/s
x16 4000MB/s  8000MB/s    15760MB/s

PCI-E 3.0 X8 has almost the same bandwidth as

 PCI-E 2.0 X16

https://www.pugetsystems.com/labs/articles/Titan-X-Performance-PCI-E-3-0-x8-vs-x16-851/


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4 Germanium

Re: Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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No.

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4 Germanium

Re: Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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There's no replacement Dell board.  That's the way it was designed.  It's also the same design for the Aurora R7, R9, and R10.

Yes, x16 is theoretically twice as fast as x8. At PCIe 3.0, each lane is a little under 1,000 MB/s. So at x8 (3.0) you'd get maximum speeds a little under 8,000 MB/s, versus maximum speeds a little under 16,000 MB/s at x16 (3.0). In a real life scenario, I'm not sure it would make a large or even a noticeable difference in gaming performance.  The CPUs mostly are not going to be using that much bandwidth.  

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4 Beryllium

Re: Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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@r72019 is correct. You find the same Dell small print in R10 spec.  And x8 works just as well as x16.  Maybe some of the saved PCIe lanes are used by NVMe PCIe ssd?

“From a quick look, there is a little below a 1% performance difference in PCI-e 3.0 x16 and PCI-e 3.0 x8 slots. The difference is not even close to perceptible and should be ignored as inconsequential to users fretting over potential slot or lane limitations.”

 

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4 Germanium

Re: Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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I run 2x 2080 Supers on an MSI Z390 MEG ACE with x8/x8 PCIe. I don't see any bottleneck either.

In before no-plex-chip.

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8 Xenon

Re: Aurora R8, GPU-Z reporting PCIe bus of only x8? #2

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X8 in PCI-e 1.0 PCI-e 2.x PCI-e 3.0


x1 250MB/s      500MB/s      985MB/s
x4 1000MB/s    2000MB/s    3940MB/s
x8 2000MB/s   4000MB/s     7880MB/s
x16 4000MB/s  8000MB/s    15760MB/s

PCI-E 3.0 X8 has almost the same bandwidth as

 PCI-E 2.0 X16

https://www.pugetsystems.com/labs/articles/Titan-X-Performance-PCI-E-3-0-x8-vs-x16-851/


Report Unresolved Customer Service Issues
here

I do not work for Dell. I too am a user.

The forum is primarily user to user, with Dell employees moderating
Contact USA Technical Support






Get Support on Twitter @DellCaresPro

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