If I boot to Ubuntu and lspci shows drivers for my GPU, does this mean it's working? I have tested performance using Globs and my scores averaged around 58 FPS.
I'm having issues getting it to be detected in Windows and was assuming it to be dead.
Running something like a 5660 on a Sony Vaio e series.
lspci with no option doesn't show drivers. It only shows detected devices. If your device turns up, it means that it's plugged in and not completely dead, but it doesn't imply that the device is working correctly.
If lspci -k or lspci -v reports that your device is in use by a driver, that usually implies that the driver was able to complete some form of initialization. It gives you more confidence that the device is working, but again not complete confidence. Buggy hardware (in the sense that this particular piece of hardware is malfunctioning, as opposed to a design issue) is fairly rare, but not impossible.
So Ubuntu was correct with the GPU working! I updated the windows install and it is now working there too.