55nm TSMC process
Single chip with "dual G92b like" cores
330-350mm2 die size
900M+ transistors
512-bit memory interface
32 ROP
192SP (24X8)
6+8 Pin
550~600W PSU min
9900GTX SLI runs Crysis 2560x1600 VH 4XAA smoothly

from VR-Zone