Long story made short, I have 4 gpu's (2 sapphire 290 and 2 xfx 290x) that were running together on a different motherboard, but on this mobo will freeze when the AMD drivers are loaded. The mobo will run when the windoz drivers are loaded got the cards. Tried with 13.11, 13.12, and 14.9 drivers.

Here's the weird part, only 3 gpus shot in windoz either way.

The long story..

I bought a gaming rig, and made a miner.. Asus SABERTOOTH_990FXGEN3_R20 mobo, 280x video, 8350 black cpu, 16gb ram.

Upgraded the GPU to 2 Sapphire GPU's and it ran.

Moved the mobo out of the case to the wooden shelf in my avatar, added another PSU, 2 XFX 290X GPU's and 4 extension cables, and it ran. (my avatar is a pic of that rig)

At this point, I had PSU #1 running the mobo and 2 GPU's, and PSU #2 was just running 2 GPU's, but it had the IDE connectors on all 4 extension cables on it. It ran fine like this for about a month.

PSU #2 started browning out (but I hadn't figured that out yet) and causing crashes to the rig. One day, I smelled that hot small of plastic cooking and shut down the rig to investigate. The mobo power connector had cooked, the PSU # 2 failure overdrew the mobo connector.

So I ordered a new mobo (Gigabyte GA-990FXA-UD3) and PSU #3 (1100 watt gold), and a couple g-blade asic miners. And PSU #2 I researched into and found out it had issues, so it's in the scrap bin.

Since then, I have been running only 2 GPU's (the sapphires) and the new mobo and asics, off GPU #3.

Now I want to run the 2 XFX GPU's again, so I take PSU #1 (with the fried connector) and hook it to those GPU's. They all power up correctly, and I read 12v at all the yellow wires.. But, windows locks up, right after the windows screen.

Boot to safe mode, run DDU, reboot and let windoz drivers load, and it runs fine but only shows 3 GPU's. (1 sapphire and 2 XFX)

Will reboot as many times as I try it, but not mine.

Load ATI drivers, and it will freeze up solid right after the next login screen. Tried it with the XFX cd, the Sapphire CD, 13.11, 13.12, and 14.9 drivers, all running DDU between. Most of them twice.

Mobo should be able to run 5 cards (add 1 more card on the pcie1 slot), and has the latest bios.

Ideas?

-edit- I swapped the 2 XFX for the 2 Sapphires and it runs with just them, so 2 will run at a time but not all 4 GPU's at once.

[Solved] GPU mining rig issues. 4 GPU's that ran together before, won't now. Support • multigpu mining • • slowhash

[Solved] GPU mining rig issues. 4 GPU's that ran together before, won't now.
Support • multigpu mining • • slowhash