Do you have the card already? If so, and the drivers did got installed, it'll probably work.
The drivers cover a wide range of cards with plenty of them which have been successfully tested. I can test just a few, and always as a rule I do my tests on budget cards of each series. If you as users insist on exploring the upper range right where uncertainty begins (exactly what I don't recommend), it's because you're happy with the experimentation task, which is of course benefitial for all us.
Test mode is required for Windows to load the driver. If the watermark annoys you, there's a tool somewhere to remove it. It has zero side effects over the OS behaviour.