I hope someone can please clear some uncertaintly to me please. I have to help my brother-in-law choose a processor for his new Dell PC. But Intel have released so many process of the same clock speed but of different flavours. eg, if we go for the 3.0 Ghz clockspeed, there's 478, 530, 531, 630, etc. Which is the faster one to get? Is there an issue with the new socket 775 version or is the old 478 (Northwood) faster, as was when the Prescott CPU's were released? Thanks.