Er what?The GK104 will probably be the card of choice for most consumers. This mid range part will also come in two flavours, the GTX 560Ti with a 224-bit bus and the GTX 660 with a 256-bit bus. The GTX 560Ti ends up with 448 cores, 850MHz clock and 154GB/s of bandwidth.
And then the 660 and 660ti are based on different chips from each other? Obfuscation galore