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I just recently updated some parts in my computer. I was running an AMD HD Radeon 5770 alongside an AMD HD Radeon 5450. The 5770 was my main card, and the 5450 powers two side monitors.

I upgraded the 5770 to an AMD RX 480, and am still using the AMD HD Radeon 5450. I am running Windows 8.1 64 bit. After installation, my main monitor was forced to 1920x1080, but it is an ultrawide and supports 2560x180. I went to AMD's website, downloaded the new driver, and it told me that the driver does not support the 5450 (or any of the 5XXX cards). After installation, my two side monitors do not display output, and in device manager the 5450 is displaying an error: "Windows has stopped this device because it has reported problems. (Code 43)".

I tried to install legacy drivers for the 5450, but that forced the RX 480 to display to 1920x1080 again, and the RX 480 displays the error that the 5450 was receiving.

At this point, I have now reinstalled the drivers for the RX 480, and am not using the side monitors.

Is there any way to get these two cards to work together in the same machine? The 5770 gets the same results as well. While yes, I could just use the onboard graphics or the RX 480 additional outputs, but I'd rather those monitors be on a separate device.

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    "Is there any way to get these two cards to work together in the same machine?". Even if the card was supported by the driver you can't typically run 2 different generations of cards in crossfire – Ramhound Jan 16 '17 at 0:39
  • I'm not trying to run them in crossfire. The RX 480 drives my main monitor, I'd like the 5450 to drive my side monitors. – Hondros Jan 16 '17 at 1:01
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    Your still attempting to do something that neither AMD nor Nvidia support. Your previous setup was the same generation of GPU which is the only reason it worked. – Ramhound Jan 16 '17 at 1:17
  • All I needed to know was if it was supported or not. Thanks! – Hondros Jan 16 '17 at 1:33
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What if you were to uninstall the older of the two drivers completely instead of having two AMD drivers. The idea being that the newer AMD driver will support the RX480 and the older card HD Radeon 5450 will "hopefully" default to use Microsofts own drivers instead of attempting to use the newer AMD driver.

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