Overcoker pc hp - est ce possible

Bonjour,
j'ai un pc hp serie m7000 avec :
Carte Mére:
Manufacturer ASUSTek Computer INC.
Model EMERY

Chipset Vendor Intel Corporation
Chipset Model 945P Processor to I/O Controller
South Bridge 82801GH (ICH7DH) LPC Interface Controller
SMBus Intel Corporation 82801G (ICH7 Family) SMBus Controller @0500h

CPU Intel Pentium D
Cpu Socket LGA775 [Socket 775]
Processor Upgrade ZIF Socket
Max CPU Speed 3800 MHz
System Slots 6 PCI
Memory Summary
Location System board or motherboard
Maximum Capacity 4096 MBytes
Memory Slots 4
Maximum Memory Module Size 1024 MBytes
Number of CPU(s) One Physical Processor / 2 Cores / 2 Logical Processors / 64 bits
Vendor GenuineIntel
CPU Full Name Intel Pentium D
CPU Name Intel(R) Pentium(R) D CPU 2.80GHz
CPU Code Name Smithfield
Technology 0.09µ
Platform Name LGA775
Type Original OEM processor
FSB Mode QDR
Platform ID 4
Microcode ID 06
Type ID 0
CPU Clock 2800.85
System Bus Clock -1.0
System Clock 200.06
Multiplier 14.00
Original Clock 2800.00
Original Bus Clock 800.00
Original System Clock 200.00
Original Multiplier 14.00
Overclock 0.03%
L2 Cache Speed 2800.85 MHz
L2 Cache Speed Full
CPU Family / Model / Stepping F / 4 / 4
Core Revision A0
APIC 01
HyperThreading 1
Cache 12 KµOps L1 T-Cache, 16 KB L1 D-Cache, 1024 KB L2 Cache
Instructions MMX, SSE, SSE2, SSE3, EM64T, XD, MSR
Architecture x86

je voudrai l'overcloker mais comment, il n'y a pas de switch sur la CM pour modifier les valeurs (dans le bios elles sont grisé)

commen faire ?

cordialement, guillaume