added a 4th gpu and it wont show up in device manager anywhere

[speedyb]

GPU wont show up anywhere what shall i do?

[fanatic26]

I would say step 1 is to at least give some info on your problem. People arent mind readers....

[cryptoking710]

You got your bios settings handy?

are you running latest bios on mother board?

[Cereberus]

First tell us the model of the motherboard. Second go to the BIOS and make sure you change PCIEX slot configuration from AUTO to GEN1 or X1 depending on the model of your motherboard. After that restart your PC, and even if it still doesn't show up and all your cards are the same, uninstall the driver with DDU(Display Driver Uninstaller) completely. Restart, install latest driver and you should be up an running if your board supports 4 cards, I think many latest generation boards do support 4 cards.

[bravetheheat]

You can check the PSU, for the most of case, your PSU cannot support so many video cards, the better way is to change a new PSU.

I assume you use Nvidia 1060, Nvidia 1070 or AMD 570/580 to mine something, you'd better use 1250W PSU.

Another reason is that the problem may come from your raiser, you can change other raisers.

If it still doesn't work, you can directly use X16 interface for testing.

[Vokas123]

Enable "Above 4G Decoding" in BIOS, that's usually a problem when MB does not recognize 4th card.

[speedyb]

H170 pro4s asrock 7600k. now should i put all the slots to gen1 or just where the risers
are

[coiner17]

I had the same problem with a Asus h170 pro gaming, it has 2 pcie 16X slots and 4 pcie 1X slots but I couldn't get more than 3 cards detected or running with that board, tried everything mentioned here and more, apparently a known issue.

Let us know if you get your problem solved.

[speedyb]

i get thi atiadlx.dll error alot or  coinst_17.30.dll

coiner. did you try doing a comnplete reinstall? just wondering?

[speedyb]

my problem is it crashes wqhen trying to instal the drivers again

[coiner17]

i get thi atiadlx.dll error alot or  coinst_17.30.dll

coiner. did you try doing a comnplete reinstall? just wondering?

I did everything. Spent 3 full days on it before I gave up and just let it run on 3 cards.

Tried reinstalling Windows, tested every riser, tested memory, tested every GPU, changed all the bios settings as recommended etc etc.

Google search provided results that others were having the same problems with this H170 board.

Now I only use Biostar boards made for mining, no issues.