Crossfire not showing up with HD 7800 series

blainemorris.morris · Jan 26, 2018

I have a diamond and msi (both 7800 series).
OS:Windows 7 64
Mobo: ASUS Z87-A
Crimson 17.12(latest stable)
Both gpus are recognized but getting no options for crossfire
Ive also tested 3 different bridges

https://gyazo.com/e430bb45420854ffc8d911656d8259b4
https://gyazo.com/a4306356b5f1daeb556be3e9d6618904
https://gyazo.com/496659f6bcab8b683193b64d98d90589

COLGeek · Jan 26, 2018

Those are different GPUs, not the same model. Look at the number of shaders in the two GPU-Z screen captures. They may not be CF compatible with each other.

Looks like you have a HD7850 and a HD7870. Put the HD7870 in the primary PCIe slot and the HD7850 in a secondary slot. Try then.

blainemorris.morris · Jan 26, 2018

COLGeek :

Yes but I thought via this https://gyazo.com/ea866b338e5f1f1e2033139ede554341 that they would be

COLGeek · Jan 27, 2018

That is why i suggested the swap in card order. The newer model may recognize the older.

blainemorris.morris · Jan 27, 2018

COLGeek :

I tried it and it didn’t help either

COLGeek · Jan 27, 2018

I seem to recall a thread regarding the newer AMD drivers causing CF issues with older GPUs. It may take a while to locate.

COLGeek · Jan 27, 2018

BTW, when you installed the drivers, were both GPUs physically installed in your system?

COLGeek · Jan 27, 2018

Also, have you tried with the "legacy" drivers?

https://support.amd.com/en-us/download/desktop/legacy?product=legacy3&os=Windows+7+-+64

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Crossfire not showing up with HD 7800 series

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