GTX 980 from 680

Looking again at the Wikipedia specs,

GTX 980 vs GTX 680: Perf/Area
GTX 980: 11.6 Mflop/ms/mm2, 0.56 MB/ms/mm2, 0.36 Mtex/ms/mm2, 0.18 Mpix/ms/mm2
GTX 680: 10.5 Mflop/ms/mm2, 0.65 MB/ms/mm2, 0.44 Mtex/ms/mm2, 0.11 Mpix/ms/mm2
Performance per total chip area goes down a little for bandwidth and texture, but up for ALU and ROP.

GTX 980 vs GTX 680: Perf/TDP
GTX 980: 28.0 Mflop/ms/W, 1.36 MB/ms/W, 0.87 Mtex/ms/W, 0.44 Mpix/ms/W
GTX 680: 15.8 Mflop/ms/W, 0.99 MB/ms/W, 0.66 Mtex/ms/W, 0.17 Mpix/ms/W
Performance per total chip power goes way up for ALU and ROP, a little less for bandwidth and even less for texture.