No signal at all to screen, computer is on

[headmaster200]

Hello everyone,

I'm building a litecoin mining rig and right now have connected everything. The system start well but I don't get any signal whatsoever to the screen connected to the third gpu ( last one of the gpu's on picture ).

The GPU's are connected to the mobo with risers. The two first gpu's with special coolers are connected with 16x risers and the last one has a 4x to 16x riser.

Does anybody know why?


screen grab

 

[lovesX79]

first thing return that Corsair junk power supply, second return all those Gigabyte 7970 and get some real video cards, third learn how to use a motherboard with its own slots, since your risers are not PCI-E 3 compatible

 

[GhislainG]

Does the card work if you insert it into the 4x slot instead of using a riser cable? Are you sure the riser cable is good? Why not use a motherboard with three electrical 16x PCI slots?

 

[unksol]

first thing return that Corsair junk power supply, second return all those Gigabyte 7970 and get some real video cards, third learn how to use a motherboard with its own slots, since your risers are not PCI-E 3 compatible

Aww look at the cute little troll...

Everyone knows corsair sells good PSUs, gigabyte make good GPUs, the 7970 GHz is the fastest single GPU available besides titan, AMD does much better at bitcoin mining than nvidia, PCIe 3 is not needed by any GPU for actual display never mind this, and the risers are just wires.

It's a cute attempt but you really have to try and make it sound like your serious or have just enough common sense in there to make people think you could actually be that dumb. You can't just say things that don't make sense if you want to troll. We'll all just laugh and dismiss you.

 

[headmaster200]

Tried exchanging the 4x riser with a 16x riser now. Get a signal at least but it's just a blue screen... Suspecting that the motherboard is somehow overloaded.

 

[headmaster200]

Tried some things now.

Aparrently when I have 2 GPU's connected through risers i get a blue-black screen right after boot logo. When I have 1 GPU connected with riser there is no problem whatsoever. For sure this must be a motherboard issue? Does anyone know how to solve it? I have a Gigabyte 990XA-UD3 rev 3.0, have the second latest drivers ( should not be a problem right? )

 

[GhislainG]

Why do you use risers when you have 3 PCIe slots? Does it work if the cards are inserted directly in the PCIe slots?

 

[headmaster200]

I have to use risers as I have installed after-market coolers on my cards. The cards with after-market coolers take 2 slots, so i can maximum have 2 gpus if I don't use risers. Besides, I wanted to space the cards out so that cooling would improve, however this may not seem to be possible now.

I noticed that after disconnecting two connected risers ( as an extender cable ) and only using one riser per card it now works properly ( at least up to two gpus for the moment )

 

[unksol]

I have to use risers as I have installed after-market coolers on my cards. The cards with after-market coolers take 2 slots, so i can maximum have 2 gpus if I don't use risers. Besides, I wanted to space the cards out so that cooling would improve, however this may not seem to be possible now.

I noticed that after disconnecting two connected risers ( as an extender cable ) and only using one riser per card it now works properly ( at least up to two gpus for the moment )

Yea... I wouldn't do that. Risers do work, but wired length and connections affect signals. In several ways. Most cables have a max length.