SDK 2.1 is incompatible with any driver after 12.3 anyway.
Hmmm, that's too bad. Is it possible to either:
-Install an old driver with 2.1 SDK and compiling the .bin, and then using that .bin while running the latest driver? That should give 2.1 performance if it works right?
or
-Manually moving the correct .dll files from the 2.1 SDK to the correct locations.
Thanks for all the information, and for your wonderful mining program