Fudzilla writes, "Cosmetic ink swatch, requires BIOS update
On March 2nd, Intel is planning to release a D0 revision of its highly popular Core i7 920 chip, which is currently using the C0 stepping. Enthusiasts need not worry though, as there is literally no difference in specifications of any kind - the difference is only cosmetic.
Basically, the serial number on the chip package will be removed from the ink swatch to reduce a potential risk of the IHS cosmetically overlapping it. There is no change to the ULT matrix content which continues to contain the serial number. In other words, the difference in package design is quite negligible to the consumer."