version #4 is littlebit faster on the 750ti, and use less CPU. (works on 6 cards celeron rigs)
Version # 2 uses much CPU on my Celeron rig.
How much faster version # 4 Version # 2 ?
Check your inbox. I have released version #3 with more hash and less cpu usage. Release #4 is tuned for 980ti. On the 750ti only a few mhash faster than #3, but with less cpu usage.