Low hashrate on one card ?

[igotek]

Asus Z270A motherborad + 8 GB DDR4 RAM + Inten Pentium G4560 socket 1151 CPU + 120GB SSD

7 x GTX1060 3GB GPU (stock settings - no oc) Driver Version: 382.53

All system is brand-new and this is my first NVIDIA rig. I always use AMD rigs.

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One GPU always shows low hashrate than the other GPUS.

I reinstall NVIDIA drivers - no solution
I reinstall windows 10 x64 - no solution

Do you have any idea how to fix it ?

[timbereagle]

I have same isssue with Z170 Pro Carbon motherboard. However my Z270A-Pro motherboards have no hashrate drop problem with 6 GPU.

[igotek]

I have same isssue with Z170 Pro Carbon motherboard. However my Z270A-Pro motherboards have no hashrate drop problem with 6 GPU.

Yes I have the same. The problem is only with 7 cards.

I see between 50 and 205 Sol/s on one card if I set up 7 cards.

[nevermind41]

Try with enabling the intel gpu and make it primary vga. There is an important point in new mainboards to use intel vga as primary in windows.You must connect it to a monitor or use an hdmi to vga convertor. If you don't connect a monitor or hdmi vga convertor,mainboard doesn't enable it.  Using primary vga intel for nvidia rigs gives better hashrates.

[timbereagle]

I found the reason. PSU!

We should always have %20-30 higher capacity PSU.

Because of PSU weak power, hashrate was smaller for 1 card. ahh now it is fixed.

[igotek]

I found the reason. PSU!

We should always have %20-30 higher capacity PSU.

Because of PSU weak power, hashrate was smaller for 1 card. ahh now it is fixed.

I found the problem on riser.

The main PCIe gives low hashrate value if we use v007 riser. The others PCIe has no problem with v007 riser.

v006 riser works well on the main PCIe.