Nehalem will destroy Tukwila for HPC. The Top500 list only has 9 Itanium systems left and that is because intel had a firesale(freesale) with leftover chips. Tukwila could go in the same socket as future xeon with the CSI socket but in the HPC space Itanium is dead. The Sun is coming up.

K Mull

There is nothing that comes close to price performance of X86.

Itanium would have died already had it not been for the desperate need of HP to find a port for HP_UX.