New Member AMD Motherboard Thread

Welcome to the forums MoonBrain. I have created a thread for your here.

Hey there. Looking to get some help on my situation. I hope I'm at the correct place.

Just got done building a new computer with B550 Phantom Gaming 4/ac and Ryzen 5 5600GT. What I realized afterwards was that the mobo only has total of one HDMI output and I need two output for two monitor setup.

I had an old Mobility Radeon HD 5000 series (don't remember the exact model) laying around, so I thought I'd give it a go, but with no luck. I have two monitors hooked up; the main one to B550 and a second one to 5000. Here are the combination of results I get:

1. Set the BIOS to default to "internal" graphics and my main monitor works great with B550 HDMI. Can't get the second monitor to turn on, even though the 5000 is recognized in Device Manager.
2. Set the BIOS to default to "external" graphics and my second monitor that's hooked up to 5000 works, although I cannot get it to update the driver properly to get to optimal resolution.

So the question is,

It's hard to imagine, but is B550 Phantom Gaming 4/ac designed *not* to work alongside another graphics card? Or is it because my 5000 is too old to be compatible?