Hello,
Interesting test results using KnaBench for single WU.
AK_v8b2_win_x64_SSSE3x.exe / PG0395_v7.wu :
Result cached, skipping execution
320.922 secs Elapsed
317.844 secs CPU time
Lunatics_x41g_win32_cuda32.exe / PG0395_v7.wu :
GTX560ti:
50.188 secs Elapsed
13.406 secs CPU time
Speedup : 95.78%
Ratio : 23.71x
GTX680:
58.278 secs Elapsed
20.875 secs CPU time
Speedup : 93.43%
Ratio : 15.23x
GTX670FTW:
63.703 secs Elapsed
22.234 secs CPU time
Speedup : 93.00%
Ratio : 14.30x
Now for the GTX6xx series you might be able to run 3 WU in parallel compared to 2 on the 5xx but still this result might be interesting.
See my comment in the other thread, as the concerns about using the x41g app, and considering intiial & ongoing running costs apply here too.