Hi i want to know what is the best Dual Core processor for my dell Dimension 9100. I have four processor choices to choose from but i don't know which one will work in this computer.

Pentium D 820 2.8Ghz

Pentium D 945 3.4Ghz

Pentium D 950 3.4Ghz

Intel Core 2 Duo E6400 2.13 Ghz

All these processors are supported on the LGA 775 Socket

PC Specs

Dell Dimension 9100

Windows Xp Pro Sp3.

Intel Pentium 4 650 3.4Ghz

Ati Radeon 5770 1gb

2Gb Ddr 2 Patriot Memory

1tb Western Digital Caviar Black HD

Creative Sound Blaster Xfi Series

Intel i945p Chipset

Bios Revision A01

Dell 375Watt Psu