It is an interesting thread and for Einstein it appears that with current drivers the additional cost of the Ti version isn't worth the added performance. However, based on a small sample, the 750 Ti outperforms the 750 by roughly 15% on GPUGrid, translating to and additional 25-30,000 credits per day. To me, particularly considering the additional 1Gb GDDR5 on the Ti version, that's worth the additional $40 outlay.