Bitcoin Forum

Today, I attempted to install a third gpu.  There was not physical space on the motherboard due to width of other cards.

I ordered a set of 6 risers via amazon prime.  They have 4 caps, 2 chips, and Sata power adaptor plugs.

First install, windows showed all three gpu..  anti software only showed one.  
Unplugged, reseated everything.

Eventually I got all three cards recognized by both windows and Radeon software

Turned on miner... started mining, crashed in 30 seconds ..  bsod video error reported

Pulled everything out, reseated, tried again,

Same issue.

Did I get bad risers?

Edit... two cards remain in mb.  Only trying one card via riser

there seems to be a missing information here, please tell us more about these:

- GPU Card Types
- Windows OS version
- Driver Version
- PSU wattagge/rating

have you get your rig up and running using 2 GPU's only?

Yeah, agree with this:


you need to give us more specifics info about your devices, so we can give you some advice. People here have experience with some specific device may have the same problems as you and they have been resolved their problems, they can give you solutions. Besides that, every device has different characteristics and problems, so detail info needed here.

I have a 460,560 and 570.  The machine has mined with the 460 solo, the 560 and the 460, and the 560 and 570.  I purchased the 570 last week, pulled out the 460 and put in the 570 due to space.  Then I ordered risers to add the 460 back, trying to use a riser is when troubles began.

Other system specs :
intel 6800k
asus a99-aII MB
ati drivers 17.12.2 in compute mode
evga p/s 750 gold (will replace before 4th card)
windows 10 fall update

here is a link to the risers i purchased https://www.amazon.com/gp/product/B074PS39BK/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

It seems all of your devices is okay, you can try to modify the AMD/ATI video driver to allow higher resolutions and refresh rates using AMD/ATI Pixel Clock Patcher / atikmdag-patcher. And try to use Radeon Software Crimson ReLive Edition Beta for Blockchain: http://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-ReLive-Edition-Beta-for-Blockchain-Compute-Release-Notes.aspx

Seems the hardware is fine, what I suspect are the clocks since you have different types of GPUs lower end GPU's can't cope up higher end GPU clocks, have you tried setting clocks individually? try to install MSI after burner and set each card to desired clock speeds.

I think I have it fixed.  I failed to enter computer bios and change the pcie speed to 1x.

This seems to have solved the issue. 

Yes bro, whenever you buy the PCI riser packs from the local market or in the online e-store you will find the issue in the PCI card when you buying the 2 number in 10 cards and most of them would not replace the PCIe cards.
This is happened to me few days before as well. I have tried to increase the number of cards in my GPU rig and I bought two RX 470 cards with the PCI package with the cards, USB cable, SATA cable all together in the one pack but one of the PCIe not working properly to me too bro.