vvbee wrote on 2025-10-03, 18:37:
As a starting point, neither. Keep going older until the next step can't do what you want to do.
In your thread about Windows XP GPUs didn't you find the Radeon HD 7750 to be a good balance of compatibility and performance going way back to pre-XP games? If that's still the case, I'd think that any GCN 1st gen card would offer a similar level of compatibility, and probably be a good alternative to Kepler or Maxwell based cards. An HD 7970 performs pretty close to the GTX 770 in a lot of cases, so could be a great option with few compromises.
Of course, compatibility should still be evaluated on a game by game basis. If he can get a GTX 970, GTX 770 or HD 7970 for cheap and it ends up being able to run everything he wants to run without any problems, then that's the ideal card for his system.
Also depends what kind of monitor and CPU he is running. Maxing out at 1080P 60Hz and using a Pentium D will make all of these rather pointlessly overpowered.
EDIT: Forgot about Physx. I feel like there was a way to use a Radeon with an Nvidia GPU dedicated to Physx, but that may have been limited to a specific driver version or required some hacks.