Hello, I have a Intel D850EMV2 motherboard. For those who are unfamiliar with it, it is a socket 478 designed for the Northwood Pentium 4 Processor. My model also has HT and max FSB of 533. Processors top out at 3.06GHz. Currently I have a 2.0 Pentium 4, 1 gig Rdram PC1066, 512 Ati Card. My main concerns are that I do not want to buy a new motherboard because I am afraid/certain that the Rdram will not work and the new Motherboards do not have AGP slots. So I was looking at a cheap 50-70 dollar shot in the arm for my computer. I am looking at a Celeron D because I believe they are nice CPUs for the price and because they offer great performance for my 533 FSB machine. Naturally my board only supports the Northwood core Pentium 4s. Could I put a CeleronD, P4 Mobile, or Prescott into my motherboard. Intel is of little help. Thanks.