I don't see anywhere in those links that says the 660 Ti is an overclocked 660. I love it when people just link drop and shout "THE SUPPORT FOR MY ARGUMENT IS IN THERE SOMEWHERE".
By the way, you linked to the OEM edition of the 660, not the retail edition that can be bought at the store.
Anandtech's 660 review shows that the 660 Ti is GK104 where as the 660 is GK106. In fact, we see that the 660 Ti is clearly not an OC edition of the 660 as the 660 Ti has lower clocks than the 660. They are different GPUs from different wafers.
Moreover, it doesn't really matter whether one GPU is an OC version of another (even though it isn't in this case). Lower tier GPUs from the same wafer have disabled cores and lower clocks due to voltage leaks. There's only one pair of GPUs in which one is a true OC version of the other: 7970 and 7970 Ghz. Even then, the 7970 Ghz is a higher binned version of the 7970.
Because not everyone overclocks to the limit and you're paying for the extra performance in electricity?
Nowhere am I obsessed at making the OP change his mind. The OP noticed that the Anandtech bench notarget linked showed to that the 660 Ti is significantly better and a 660 Ti is ~$10 cheaper. I pointed out that there has been driver optimizations that swing the balance in AMD's favor and linked him TechPowerUp's Catalyst 12.11 benches in which the 7950 pull ahead marginally. I also pointed out to the OP that the two are roughly equivalent at stock and that:
The OP decided with the new information that he rather go with the 660 Ti.
Then you come along all upset that the OP didn't choose the 7950, your secret crush, and start spreading blasphemy: comparing a factory OC 7950 to a stock 660 Ti, using stock 7950 power consumption figures to bash my power consumption argument and claiming that the 660 Ti is just an overclocked version of the 660.
I think you're the one who lost all credibility when you started using Youtube video guides as factual information instead of using articles from renown benchmarking sites. It got even worse when you pointed to the 660 OEM specs instead of 660 retail specs.
Bolded the most important part that you missed.
Take the HIS 7950 Toffie linked with an average 40W increase in load power consumption. If the OP plays 4 hours a day at UK's average $0.15/kWh, it will cost him an additional $8.76 per year in electricity. Take into account the fact that one of these cards is $240 and the 7950 no longer seems like such a great bargain.