RX580 CrossFire not working

radeon_rx480

Commendable
Dec 13, 2016
8
0
1,510
I am trying to use CrossFire and my second Radeon RX 580 is not recognized by my motherboard (AsRock X470 Master SLI/AC.) Both cards are MSI Radeon RX 580s, and the CPU is the Ryzen 5 2400G. I currently have 16GB of Kingston HyperX Fury DDR4-3466 installed. I am using a 750W EVGA 750 G2 PSU. Both cards work fine in the top slot but I cannot get the motherboard to recognize either card in the bottom slot. Even if I use the card in the bottom slot and I remove the one in the top slot, I will not get any video output from the second card regardless of which one it is.
 
Solution
There's nothing wrong with the mobo. The 2nd x16 slot only works with a ryzen cpu, not an APU, because APUs only have 8 PCIe lanes.

See the info under "slots"
https://www.asrock.com/mb/AMD/X470%20Master%20SLIac/index.asp#Specification

This will be the case with pretty much any mobo AFAIK.

radeon_rx480

Commendable
Dec 13, 2016
8
0
1,510
That's what I'm saying, the second GPU isn't recognized by the motherboard. I can't enable it in the AMD settings for this reason. I have tried installing one graphics card and putting it in the second slot. I will get no video output from the slot but it works fine in the first slot. I'm not sure if the second slot is dead or something but I hope not.
 

radeon_rx480

Commendable
Dec 13, 2016
8
0
1,510
[quotemsg=21151321,0,1715339]It's incredibly rare that the second PCIE slot is defective however it has happened to me when I was running SLI.

It worked for awhile then stopped post thunderstorm with no safety precautions.[/quotemsg]

Hmmm. Any idea what else it could be?
 

WildCard999

Titan
Moderator
[quotemsg=21151336,0,2379941][quotemsg=21151321,0,1715339]It's incredibly rare that the second PCIE slot is defective however it has happened to me when I was running SLI.

It worked for awhile then stopped post thunderstorm with no safety precautions.[/quotemsg]

Hmmm. Any idea what else it could be?
[/quotemsg]

Considering you've tried the second slot with no video that's what I'd suspect, sorry it's kind of crappy as you'll need to RMA the board.
 

radeon_rx480

Commendable
Dec 13, 2016
8
0
1,510
[quotemsg=21151340,0,1715339][quotemsg=21151336,0,2379941][quotemsg=21151321,0,1715339]It's incredibly rare that the second PCIE slot is defective however it has happened to me when I was running SLI.

It worked for awhile then stopped post thunderstorm with no safety precautions.[/quotemsg]

Hmmm. Any idea what else it could be?
[/quotemsg]

Considering you've tried the second slot with no video that's what I'd suspect, sorry it's kind of crappy as you'll need to RMA the board.
[/quotemsg]

Hmmm, the fan does come on, is that any possibility that it's not the slot?
 

WildCard999

Titan
Moderator
[quotemsg=21151343,0,2379941][quotemsg=21151340,0,1715339][quotemsg=21151336,0,2379941][quotemsg=21151321,0,1715339]It's incredibly rare that the second PCIE slot is defective however it has happened to me when I was running SLI.

It worked for awhile then stopped post thunderstorm with no safety precautions.[/quotemsg]

Hmmm. Any idea what else it could be?
[/quotemsg]

Considering you've tried the second slot with no video that's what I'd suspect, sorry it's kind of crappy as you'll need to RMA the board.
[/quotemsg]

Hmmm, the fan does come on, is that any possibility that it's not the slot?[/quotemsg]

It doesn't take much to run the fan, contact Asrock (link above) before RMA.
 

TJ Hooker

Titan
Ambassador
There's nothing wrong with the mobo. The 2nd x16 slot only works with a ryzen cpu, not an APU, because APUs only have 8 PCIe lanes.

See the info under "slots"
https://www.asrock.com/mb/AMD/X470%20Master%20SLIac/index.asp#Specification

This will be the case with pretty much any mobo AFAIK.
 
Solution

TRENDING THREADS