GA-Z87X-OC not detecting 4th Graphics card

RoyStem

Honorable
Jan 12, 2014
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10,510
Hello,

I'm building a Litecoin mining rig but i'm having serious issues with the hardware.

This is my hardware:
MB: GA-Z87X-OC rev1
GPU: 4x AMD Sapphire 3GB D5 X R9 280X Dual-X OC
CPU: Intel G3220
PSU: Club 3D 1200Watt

[I actually plan on building 2 of these rigs, I already have all the hardware]

now the setup works fine if i just connect 2 cards directly on the PCI-E slots.

I'm being forced to use powered riser cables to get all the cards far enough apart to make them cool propperly.

But now i'm having more and more problems.

Problem number 1:
not all 4 cards are showing in the device manager and one card always has the yellow triangle on it telling me some sort of shit has hit some sort of fan... Code 43 it's telling me.

Problem number 2.
The PC seems to have a strong desire to just reboot itsself on and on and on.

I've seen plenty of photo's of people running 4 or more cards on one MoBo. i'm even using the propper cables.

What worries me the most is that the 4th card is just not showing up. How do i get it to detect all 4 cards? The MoBo should be able to handle this from the get go... as it's very specifically marketed as a 4x gpu OC MoBo.

Can someone please give me some pointers because I really can't return any of the hardware due to buying it at a store that has terrible return policy. It just HAS to work. :(

Please let me know if more info is required.