Dell Motherboard

I Have this mobo:

Motherboard
Manufacturer Dell Inc.
Model 0CT017 (Microprocessor)
Chipset Vendor Intel
Chipset Model P965/G965
Chipset Revision C2
Southbridge Vendor Intel
Southbridge Model 82801HH (ICH8DH)
Southbridge Revision B0
BIOS
Brand Dell Inc.
Version 2.5.3
Date 11/22/2007

zocket LGA775

I Would like install a fastest processor . By the way it came with the next cpu:

Intel Core 2 Duo E6600
Cores 2
Threads 2
Name Intel Core 2 Duo E6600
Code Name Conroe
Package Socket 775 LGA
Technology 65nm
Specification Intel Core2 CPU 6600 @ 2.40GHz
Family 6
Extended Family 6
Model F
Extended Model F
Stepping 6
Revision B2
Instructions MMX, SSE, SSE2, SSE3, SSSE3, Intel 64, NX, VMX
Virtualization Supported, Disabled
Hyperthreading Not supported
Fan Speed 1014 RPM
Bus Speed 265.4 MHz
Rated Bus Speed 1061.4 MHz
Stock Core Speed 2400 MHz
Stock Bus Speed 266 MHz
Average Temperature 21 °C

For your help,in advance: Thanks!!!

Fesco