wbmw, great link, thanks. I think my estimate must be corrected. I think 16-20 6U 2P Opteron blades is quite realistic. Pentium-M dencity is not achievable, obviously, when they make a low power one. But the fact that Opteron 2P servers scale around 90% or better, make one blade quite a powerful gun. Most people will find 40P Opteron server more convenient and powerful than 128P Centrino server. Only few applications scale well, the rest will prefer good speed from each unit. Otherwise what was the point of Itanium if Centrino approach is better?