Also I lied with regards to first motherboard specs (was working from
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
Nou is correct, the gamers will not notice this problem so much.
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
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.
Uh!... Looks like there is the same issue with new nVidia 680 cards
drivers on X79 motherboards
(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)?
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