I recently installed a Gigabyte G1 gaming RX480 4GB, replacing a R7 260x. On the 260x, I was hitting a steady 50 fps in Skyrim, 30 in Age of Empires 2 (I assume it's limited) and high 90s in Gemcraft 2. These all have low requirements, so I was pretty surprised when the 480 was hitting 25 fps in all of them. But, I get a score of 9200, give or take, in Firestrike. So the card seems to work, but only when it's forced to stretch its legs. I'm stumped on this one. I mean, the card doesn't seem to be faulty if it runs the benchmarks ok, but in game it's on par with integrated graphics. Nothing I've tried has gotten the FPS to budge, and on top of that the loading times have gone from around 10 seconds to 2 minutes in Skyrim.
i5 4440 3.1 Ghz
Gigabyte Z87M D3H
Corsair vs 650 PSU
Windows 10 64bit
Things I've tried:
Clean uninstall/reinstall of latest drivers
Resetting Windows 10
Using older drivers (16.7.1)
Disabling Vsync in Skyrim
Reinstalling the games (twice, as the Windows reset wiped them)
Increasing power limit by 50%
Setting power scheme to high performance in Windows
Changing settings from Ultra high to Low quality (Skyrim)
Updated GPU BIOS from F4 to F5
I can't think of anything else I could try to resolve this. There's no system bottleneck, since everything was fine with a lesser card. Any suggestions would be hugely appreciated, I'd hate to send the card back and find out it was some setting I'd overlooked.