5 GPUs worked and now only 4 GPUs work

[adaseb]

Having issues getting all GPUs to work.

At first I had a Gigabyte Z87X-UD3H board, I managed to get 4 GPUs working but after a few days only 3 would work. When 4 were connected, it would just keep rebooting and rebooting. If 3 were connected, it worked fine. After some searching, many had similar issues with this motherboard so I bought another motherboard.

This time a Z97X-SLI, I managed to get all 5 GPUs working for a day or two. Then the same issue, only 4 would work. If 5 were plugged in, the motherboard keep rebooting and rebooting.

Just wondering if anyone here had the same issues or suggest a different motherboard?

[Ademen]

The best motherboard to mine is the Asrock ProBTC series the H61 and H81 mother boards. They are very reliable.

[sanadas]

I think the H61 motherboard is no longer produced any more, but you can buy in Eabay. It is very reliable.

[joblo]

Having issues getting all GPUs to work.

At first I had a Gigabyte Z87X-UD3H board, I managed to get 4 GPUs working but after a few days only 3 would work. When 4 were connected, it would just keep rebooting and rebooting. If 3 were connected, it worked fine. After some searching, many had similar issues with this motherboard so I bought another motherboard.

This time a Z97X-SLI, I managed to get all 5 GPUs working for a day or two. Then the same issue, only 4 would work. If 5 were plugged in, the motherboard keep rebooting and rebooting.

Just wondering if anyone here had the same issues or suggest a different motherboard?

Are you supplying enough power to the GPUs? Make sure the PSU is big enough and all power connectors are
connected and use powered risers on x1 slots.

[adaseb]

I think I solved the problem. I was using a 16x to 16x riser and replaced it with a 1x riser so the card ran on 1x lane instead of 16x lane.

[parmatiya]

I think I solved the problem. I was using a 16x to 16x riser and replaced it with a 1x riser so the card ran on 1x lane instead of 16x lane.

So the 16 lanes are shared by the graphics cards. I wonder why once 5 worked, but now only 4 work with the 16 lane.