Only 4 of 6 rx580 gpu works.

[zaka221]

Hello. My mining rig currently has 6 gpu Rx580 . But mining only 4. I ran a computer with each card individually and all worked. I even re-installed windows 10 on UEFI. Still same problem. My power supply is evga 1300w. I same problem on Ether, Vertcoin. Mainboard H61 pro btc. But long time ago all 6 works. Any idea how can i fix that.

[jillscarbrough]

are all those cards shown in device manager? but 4 cards only that can use for mining?

or 4 cards only that has detected by the system?

[Guvn0r]

I am not sure if this issue was fixed later but when 500 series was released people had trouble getting 5+ cards to run on a single rig. Here is a video by Cryptomined which explains a possible fix (by mixing up drivers).

https://www.youtube.com/watch?v=fTusQ0omj8M

I am not certain if this is the actual problem, but you can give it a try anyway. Goodluck

[zaka221]

Yes all 6 card i can see in drive manager. Now in mkxminer in hashrate i have :25~, dead, dead,25~,25~,25 ~
.
Yes i trying that driver for youtube movie, still same, I even try special driver for mining https://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-ReLive-Edition-Beta-for-[Suspicious link removed]pute-Release-Notes.aspx

[swogerino]

There is no need for special driver for mining , enter your bios and make sure you have set all your pcie slots to pciex1. 

Also disable everything that you don't use in bios like the audio or some usb ports. H81 pro btc is a gen 4 motherboard and has not many resources.

Last resort uninstall blockchain driver and try latest adrenaline driver, just change gpu workload from graphics to compute to have same performance as with the blockchain driver.

[Midcrypto]

Hello. My mining rig currently has 6 gpu Rx580 . But mining only 4. I ran a computer with each card individually and all worked. I even re-installed windows 10 on UEFI. Still same problem. My power supply is evga 1300w. I same problem on Ether, Vertcoin. Mainboard H61 pro btc. But long time ago all 6 works. Any idea how can i fix that.

Here is a thread similar to yours: https://bitcointalk.org/index.php?topic=2848780.0

I would start by checking the catalyst control settings.