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revisionfx
Journeyman III

Re: Slow PCIe bus with single GPU in x16 slots, seeking cause

Also I lied with regards to first motherboard specs (was working from

memory)

Asus P8Z68-V PRO/GEN3 i7 i5 i3 LGA1155 Z68 DDR3 - work as expected

(transfers match specs)

Asus RAMPAGE IV Extreme i7 X79 LGA 2011 DDR3 PCIE - slow transfers

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drallan
Challenger

Re: Slow PCIe bus with single GPU in x16 slots, seeking cause

Nou is correct, the gamers will not notice this problem so much.

revisionfx wrote:

I remember seeing a similar issue with an Nvidia driver for linux versus

on windows on same machine. I wonder if the AMD openCL driver has a role

in there?

No, I don't think the AMD drivers have anything to do with the slowdown.

From what I found AMD bufferbandwidth.exe is probably the best way to test PCIE transfer speed. Can you try that and post the numbers, I would be interested to see. Use these settings

Command line: D:\>bufferbandwidth -d 2 -t 3  -if 0 -of 1

PS, the RAMPAGE motherboard has a small 6-pin PCIE power connector very near PCIE slot 1 near the audio output. Asus recommends plugging power into that when using many GPUs. (I think this is only for Xfire, but most boards have this) Maybe you can plug that in.

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revisionfx
Journeyman III

Re: Slow PCIe bus with single GPU in x16 slots, seeking cause

Uh!... Looks like there is the same issue with new nVidia 680 cards

drivers on X79 motherboards

http://www.techpowerup.com/162942/GeForce-GTX-680-Release-Driver-Limits-PCI-Express-to-Gen-2.0-on-X79-SNB-E-Systems.html

(and something like x8 instead of x16 speed as well)

Is it the same with AMD drivers (and is this only openCL, haven't tried

yet if it makes a difference to read pixels from RAM with openGL and

interop to openCL that memory)?

Pierre

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rocky67
Journeyman III

Re: Slow PCIe bus with single GPU in x16 slots, seeking cause

Please advise wht is the best option when there are the same numbers being shown in different programs such as PCI Speedtest and PCUeBandwidth because I am stuck up

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