wich CPU will work

i have an ASUS A9RP and want to upgrade the processor.wich cpu will work,any core duo maybe?????
simple spec of my laptop is:

P.S sorry for my english
info
Processors Information
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Processor 1 ID = 0
Number of cores 1 (max 1)
Number of threads 1 (max 1)
Name Intel Celeron M 420
Codename Yonah
Specification Intel? Celeron? M CPU 420 @ 1.60GHz
Package (platform ID) Socket 479 mPGA (0x5)
CPUID 6.E.8
Extended CPUID 6.E
Core Stepping C0
Technology 65 nm
Core Speed 1600.2 MHz
Multiplier x FSB 12.0 x 133.4 MHz
Rated Bus speed 533.4 MHz
Stock frequency 1600 MHz
Instructions sets MMX, SSE, SSE2, SSE3
L1 Data cache 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache 32 KBytes, 8-way set associative, 64-byte line size
L2 cache 1024 KBytes, 4-way set associative, 64-byte line size
FID/VID Control no

Chipset
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Northbridge ATI RS400/RC400/RC410 rev. 01
Southbridge ATI SB400 rev. 80
Memory Type DDR2
Memory Size 1536 MBytes
Channels Single
Memory Frequency 266.5 MHz ()
CAS# latency (CL) 4.0
RAS# to CAS# delay (tRCD) 4
RAS# Precharge (tRP) 4
Cycle Time (tRAS) 12