maybe it's still a G71 but with a slightly different package. afterall, a NV45 is a NV40. or it's just bullshit, or 7900GT and 7900GTX are considered as different GPUs in the marketing department.
a 7900GX2 card has two G71 and a nexus chipset with 16x PCIe lanes to each GPU plus 16x PCIe lanes to the PCIe slot, right?
maybe the PCIe lanes on the GPU packages are placed somewhat differently (I'm talking out of my ass, really don't know anything). and I can imagine PCIe lanes between nexus and GPU running at twice the standard frequency, 8GB/s full duplex between the GPUs would be more sexy that 4GB/s (number still low if the two cards spend their time ping-ponging stuff when doing post-processing that depend on the preceding frame? )
or like I said, no new GPU. when Athlon FX-60 comes out for example, it's called a new CPU whereas it's no different than a X2 4400+ or 4800+