Sapphire Nitro Rx470 4GB very low hash rate on EThereum

[brizio71]

Hello,
I have buid a second RIG using Asrock Q1900M 4GB RAM on Windows 10 64bit and 2 GPU Sapphire Nitro RX470 4GB,
the first GPU is directly connected on PCI-e x16 and the second one with a powered riser X1 flat cable.

The directly connected PCI-e x16 GPU work at 25 MH/s but the second one run at 4 MH/s does anyome have the same issue ?

Can be a rider PCI-e card problem (i have try 2 different riser with flat powered cable?

I have try all possible combination on Bios side (gen1 gen2 gen3).

Thanks

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[Iegion]

try running it without a monitor and clear out all overclock settings.

[Dowper]

Attach the monitor on gpu2.

[brizio71]

Attach the monitor on gpu2.

no video out on gpu2

[Raja_MBZ]

Did you try using the Claymore ethereum miner? Which driver are you using? It could be happening because of undervolting... I'd suggest you to first try re-installing the drivers and do not play any over-clocking with it. If even that doesn't work, try a re-install of Windows 10.

USB risers are usually fine, I don't think so that it is their problem until and unless it's a 3rd class version.

[brizio71]

Did you try using the Claymore ethereum miner? Which driver are you using? It could be happening because of undervolting... I'd suggest you to first try re-installing the drivers and do not play any over-clocking with it. If even that doesn't work, try a re-install of Windows 10.

USB risers are usually fine, I don't think so that it is their problem until and unless it's a 3rd class version.

I use Claymore miner, I have try to update to last driver, I have try also to use simplemining softare directly from USB pen always same result !

I have order another riser pcie the USB version I hope this will solve this problem

[philipma1957]

Attach the monitor on gpu2.

no video out on gpu2

What cable do you use?

Those sapphire have hdmi  output and display output.

My trick is use a hdmi  to dvi cable adapter.

I plug the hdmi dongle into the sapphire i plug a dvi cable into the dongle and into a dvi monitor this stops the 4mh issue.

Sapphire cards seem to always have black screen no video out issues via the hdmi jack.

I first had this show mining btc with hd 7950 sapphire cards.

Back to rx 470 I have three or four Dvi to hdmi  adapter to get past the issues of no video

Which I think causes the 4mh bug