Yes, the 670m and 675m are still fermi based.
For game only the 7970m is on the top and cheaper than 680m, but it run hot and not energy efficient. And I will say take the laptop with the 7970m.
Thanks! ended up getting the m17x r4 with the 7970m, absolutely flawless!! Came with 8gb ram, 256gb ssd + 750gb hdd, 1080p, i7 3720. all like new condition for $1500, pretty stoked with this deal..