Gigabyte 4Gb Gaming RX580 hashrate issue

[YakETy]

Hi,

I just made a new rig using RX580 Gigabyte gaming.

I flashed my cards with a custom BIOS and was achieving 820 H/S with only 1 card on the mainboard.

Now that I put all the 6 cards on the mainboard (H81 PRO BTC 2) each card achieve 725 H/S and I can't get higher hashrate.

Do you have any idea why ?

Thank you for your help on this one.

Christophe

[1715261898]

1715261898

[1715261898]

1715261898

[TorbjornE]

It makes sense to specify the version of the miner program that you use. And maybe the reduction depends on the fact that one of the cards is loaded with the task of output to the monitor.

[YakETy]

Yes, sorry, you're right.

I am using XMR-STACK. The initial test was done with a monitor in it (as I found out that thos gigabyte cards couldn't be flashed, I had an erroe in ATIFLASH, without a monitor attahced)
I could understand the hint on 1 card, but not on the 6 of them with the monitor output.

[TorbjornE]

Yes, sorry, you're right.

I am using XMR-STACK. The initial test was done with a monitor in it (as I found out that thos gigabyte cards couldn't be flashed, I had an erroe in ATIFLASH, without a monitor attahced)
I could understand the hint on 1 card, but not on the 6 of them with the monitor output.

This program never used, maybe it's in it. I would try other programs and compare their result with the result of the same cards on the Internet.

[bachani_rs]

Not exactly the same issue, but I also noticed that the hashrate was a bit better on my gaming pc with single GPU than in the rig with 6 GPUs with the same cards.