Nvidia's GF104 is crippled from the start
 

In addition to the specs of the GTX 460 card that were leaked a while back, we managed to score additional bits and pieces of the information and it looks like that the GF104 will be crippled from the start. This leaves room for a new card that will be based on the non-crippled GF104 with full specs.

The GF104 should have 384 SPs organized as 16 clusters of 24 SPs. The leaked screenshot that Expreview.com managed to grab showed the GTX 460 with 336 SPs/CUDA Cores which means that it has 2 disabled cluster which leaves it at 336 SP. The full GF104 has a 256-bit memory interface, but with one MC block disabled you get the 192-bit memory interface seen on the leaked specs list for the GTX 460.

http://www.fudzilla.com/content/view/19199/1/