Funny thing is that even the GTX 560 Ti seems to perform synonymously with the GTX 750 Ti.Yes, but spec-wise wise the 750 ti should destroy the 295. The 295 total (both GPUs) has 480 cores compared to 640 on the 750 ti. The GTX 295 had 1.7GB of GDDR3 compared to 2GB of GDDR5 on the 750ti. I don't understand how that makes the GTX 295 faster. Not to mention that in most games you would have to disable one of the 295's GPUs since most games don't play nicely with dual GPU cards.
I think the friend I'd had with the i5-2400 and HD 6850 got a GTX 750 Ti after his 6850 died.
I've heard it doesn't use a lot of Wattage and runs cool; maybe that is why it isn't indefinitely powerful.
Another point is that everything depends on the generation. Back in the 560 Ti days, Nvidia could achieve a lot more per a lot lower core count than AMD could.
For example, the 560 Ti has two versions - one with 384 cores and one with 448 cores. Even the version with the 384 cores beats the Radeon HD 5870 which retains 1600 cores.
So simply said, all generations differ. And it is quite possible the aforementioned scenario has definitively taken place within Nvidia's own generations.