660 ti use 670 pcb?

Don't waste your money on a 660 TI. They overclock poorly. Get a 670 or get a cheaper AMD card or else you're wasting money.

ok, i was thinking of getting a evga 670 3gb ftw card

I don't think that there are 3GB GTX 670s. There are 2GB and 4GB models only as far as I'm ware.

oops the 2gb miss type lol

I think all of the reference models use the reference 670 PCB. There are 3GB models of the 660 Ti, as well as 2GB. The GTX 660 Ti overclocks to GTX 670 performance in several benchmarks, for about $100 less.
http://www.hardocp.com/article/2012/08/23/galaxy_gtx_66...

Good luck getting your memory that high. That's really pushing GDDR5's limits and you're unlikely to reach it in the real-world, let alone reach it with stability. That was a cherry picked card as is obvious from the GPU and memory clock frequencies attained compared to even the 670 (same exact GPU and the same memory controllers, just a different amount of them and the ROPs) and other cards. Also, the 7950 can easily beat a stock 670, so it's irrelevant anyway.

Originally I planned on purchasing a 660TI and getting a 670 waterblock, but then I figured a 660ti and a waterblock would be the same price as a 670.

If you get the ASUS Direct CU II GTX660ti you will have both a silent card and one which does not need water cooling.

ASUS' propitiatory 'Super Alloy Power' manufacturing processes provides cooler operation with longer component lifespan. http://www.youtube.com/watch?v=IUX5Mi996oY

Plus their direct CU cooling solutions are silent.

Check out what makes the GTX660ti directCUII different from the reference GTX660ti:

GTX 660 Ti Teardown & Comparison: ASUS DirectCU II vs Reference
http://www.youtube.com/watch?v=eRi9wow9sq0&feature=em-u...

It is an impressive difference ASUS has made with their custom PCB.