Enabling AMD Crossfire - second card is "Disabled Adapter"

[cooper69]

I had a second 5450 laying around and decided to throw it into my mom's computer along with another 5450 just for fun. on a 775 p5k deluxe motherboard.

I've installed the cards in a variety of ways, including one at a time, in different orders. I clean installed drivers, rebooted, etc. and there's no option to enable crossfire. in catalyst control center, it reads under information -> hardware that there is a disabled adapter" which happens to be the second card. Each card works in either slot by themselves

I double checked that both the 5450 and P5k motherboard do indeed support crossfire. even though it's a bridge-less, internal crossfire.

I've done some looking around and i was wondering maybe if the second card running at 4x pci-e 1.1 might be an issue. I'm on Windows 10 btw.

Here are GPU-z Screenshots:

Can anyone help?

 

[LTC8K6]

http://support.amd.com/en-us/search/faq/235

4. Please ensure each card is working properly on its own. Make sure each of the PCIe slots are operating at the minimum of PCIe x8 speed.

Maybe that's it?

 

[LTC8K6]

Latest BIOS on the mobo?

 

[cooper69]

http://support.amd.com/en-us/search/faq/235



Maybe that's it?

Latest BIOS on the mobo?

yep, latest bios on the motherboard. i'm guessing the pcie x4 is the culprit. a little misleading to advertise crossfire on the box i guess

 

[VirtualLarry]

Crossfire DOES work with PCI-E x16/x4 mobos.

I think that it's just an artifact of something.

When I experimented with Crossfire, with my HD4850 cards, on my X48 mobo, I had the same thing happen. In CCC, one of the cards was listed as "Disabled". Yet, my benchmarks in 3DMark matched up with Crossfire systems.

I would benchmark them, and if they seem in the ballpark of a CF rig with those cards, then I would assume that CF is working, and not worry about it.

 

[cooper69]

Crossfire DOES work with PCI-E x16/x4 mobos.

I think that it's just an artifact of something.

When I experimented with Crossfire, with my HD4850 cards, on my X48 mobo, I had the same thing happen. In CCC, one of the cards was listed as "Disabled". Yet, my benchmarks in 3DMark matched up with Crossfire systems.

I would benchmark them, and if they seem in the ballpark of a CF rig with those cards, then I would assume that CF is working, and not worry about it.

any 3d application I run pegs GPU1 at 100% usage with GPU2 at 0%, so that gives me the assumption that it doesn't work. I can't speak for performance, since i still won't have optimal performance regardless