I've heard the Radeon isn't as good because of optimization in the plug-ins (the author has a GeForce).
How much worse is the performance of, say, a HD 4850 versus a GTX 260.
Most of those issues have been addressed and the ATI cards perfrom at or nearly at the same level now.
Can a developer confirm either way?
The latest versions of GSDx are supposed to have fixed the issue with ATI performance, so yes, it has been addressed.
Ah, that's the thread I was looking for, thank you.
CPU offloading has been fixed already, and performance drops too.