The short answer is no as you would have to replace the motherboard also. The first thing to check is what processors speeds the MB supports and replace it with the fastest you can find or afford. CPU replacements hardly ever make economic sense. Kevin Brown KevPro Computer Services 480-214-0144 kevpro.com -----Original Message----- From: Personal Computer Hardware discussion List [mailto:[log in to unmask]] On Behalf Of Gail Kefalas Sent: Tuesday, July 24, 2007 6:17 AM To: [log in to unmask] Subject: [PCBUILD] replace dell laptop cpu Hello. I have an Dell Lattitude D600 laptop with a Pentium M processor. I would like to replace the cpu with a faster processor. Would it be safe to replace it with a Pentium M, Socket 478 cpu? It currently has a socket 479 cpu. GailKef PCBUILD's List Owners: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]> PCBUILD's List Owners: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>