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Has anyone else experienced an issue with Claymore ZCash Miner v7.0 regarding only one of the GPU's working at half it's strength?

These three rigs are using all 480 8GB Sapphire Nitro+ cards.

All of the Sol/s is great except that one...

I have hard reset, checked all the cables, removed the overclock, and switched the bios yet nothing will budge it.

No matter what I do; I can't bring it up to speed. The lazy swine.

Does anyone have any suggests?

maybe try to put a monitor on this card

Does it have to be a monitor or can it just be a adaptor? Sure I read earlier in the thread people have been using cheap adaptors from ebay/amazon to help fix this.

For me an adaptator never work only, custom adaptator maybe or dummy plug like this
http://www.ebay.fr/itm/5-PACK-DVI-Graphics-Card-Display-GPU-Detection-Monitor-Dummy-Plug-Adapter-VE-D11-/271595376795?hash=item3f3c58909b:g:4wEAAOSwQYZWzkGt

You know that they talking about RX480 cards...you post link to DVI dummy!?

yes I know, you should check sapphire nitro rx 480 not ref modele
http://sapphirenitro.sapphiretech.com/en/480-8.html

I don't know if hdmi-vga dummy plug will work on rx 480.. but I use old monitor with vga connector & connect it to my sapphire nitro rx 480 4gb with hdmi to vga adapter.. and it works.. i can play game or mining normally..

here's the hdmi to vga adapter i use:
https://www.tokopedia.com/rap-eo/kabel-hdmi-to-vga-female-adapter

maybe we can also make dummy plug with this adapter using resistors like in dvi to vga dummy plug... like this one:
https://www.youtube.com/watch?v=6AwxoIfic4k

Custom dummy plug will not work. The RX470/480 only have DVI-D and the adapter plugs convert DVI-A to VGA.
I recently bought this one and can confirm it works very well http://www.ebay.com/itm/191847993749

HDMI Dummy Plug (Display Emulator). This is what I use. $15.00 on Amazon.

http://a.co/gM0d6Yn

I use these same ones, they work good. If you don't have monitor, sometimes can't see temperatures, and some cards for some reason the clockspeeds don't ramp up like they should without monitor, it's weird, and usually you don't need monitor/emulator. You can get one, and use for multiple rigs, after it is plugged in it usually stays. Makes remote desktop better also. If you have an APU, you can plug monitor into that, since its an AMD GPU. It's an oddity of the driver....