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Help! Crossfire with three cards(trifire) and a GA-990FXA-UD5 rev3

Hello everyone :-)

I have a problem with this trifire, I cant get all the cards to be linked, one or two is allways disabled, depending on the config.

I have a Gigabyte GA-990FXA-UD5, Socket-AM3+ rev3 and 3x XFX Radeon R9 280X 3GB GDDR5

Ive connected the cards like this: They are al connected with the crossfire connection



In this config, the PCIe5 Card is disabled in CCC and cant be used. I can only crossfire 1 and 3 with x16

#Option 1
PCIe 1 - XFX    x16 card primary display adapter
PCIe 2 - Empty
PCIe 3 - XFX card x16
PCIe 4 - Empty
PCIe 5 - XFX Card  x8

#Option 2
PCIe 1 - XFX    x8
PCIe 2 - Empty
PCIe 3 - XFX card x16 card primary display adapter
PCIe 4 - Empty
PCIe 5 - XFX Card  x8

Card in 5 is still disabled and I can crossfire card in 3 and 1, but 1 runds at lower speed. (?)


#Option 3

PCIe 1 - XFX card   x16
PCIe 2 - Empty
PCIe 3 - XFX card  x16
PCIe 4 - Empty
PCIe 5 - XFX Card  x8  card primary display adapter

In this configuration both the card in 1 and 3 is disabled. I can only use card 5 alone.


IS there something I have done wrong. I've changed the cards, so All of them has tried each other ports.
THis is getting frustrating :-/
Any smart brains out there that can help me out and point out the obvious here? :-)


Re: Help! Crossfire with three cards(trifire) and a GA-990FXA-UD5 rev3
« Reply #1 on: April 01, 2015, 09:48:45 pm »
Solved it, I had 4 F-O-U-R faulty crossfire cables! Its amazing, changed the cables to complely new and different branding, and it worked, jeezez. The XFX Crossfire bridges, you cant trust them :-/