@cbuchner1
I have noticed something very strange between x86 and x64 of the 2-28 release regarding:
-a scrypt:2048 -l T5x20 -C 2 -b 4096 -i 0
On a 750ti using x86 will result in pretty normal hashing.
On a 750ti using x64 results in probably 1/10th if not less the x86 performance.
As an add, I think cudaminer can make
huge gains in performance if you can save all that bus bandwidth. But that's just my armchair coders opinion.
When I initially got my 750tis, I forgot to select pci 2.0 and I was running pci 3.0. While the machine could keep up, 5 of my 6 cards would do 375 to 400 khash on scrypt, the last card would do about 170. Eventually the system would eventually choke up due to an interrupt storm, but if those numbers are at all accurate I think cudaminer could squeeze out 25% more performance than we have now.
Again, I deffer to your expertise -- but I am very optimistic about future performance increases.