ACER ASPIRE 9510 Upgrade

Hi all,
i would like to upgrade this laptop (specs shown below as taken from CPU-Z) and i am wondering if i can:

a. Replace the existing T2400 CPU with a Intel® Core™2 Duo processor.
If yes can you tell me which one should it be ?

b. Increase the RAM to 4GB. The only question i have for this is, the current seems to be running on 1/2 of the speed that the bus can (Ram at 333 MHZ whereas Bus is at 666 MHZ).
Getting a RAM which is running at 666 MHZ will provide any additional performance ?



CPU-Z 1.44.2 report file
Processor(s)
Number of processors 1
Number of cores 2 per processor
Number of threads 2 per processor
Name Intel Core Duo T2400
Code Name Yonah
Specification Genuine Intel(R) CPU T2400 @ 1.83GHz
Package Socket 479 mPGA
Family/Model/Stepping 6.E.8
Extended Family/Model 6.E
Core Stepping C0
Technology 65 nm
Core Speed 1828.7 MHz
Multiplier x Bus speed 11.0 x 166.2 MHz
Rated Bus speed 665.0 MHz
Stock frequency 1833 MHz
Instruction sets MMX, SSE, SSE2, SSE3
L1 Data cache (per processor) 2 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache (per processor) 2 x 32 KBytes, 8-way set associative, 64-byte line size
L2 cache (per processor) 2048 KBytes, 8-way set associative, 64-byte line size
Chipset & Memory
Northbridge Intel i945PM rev. 03
Southbridge Intel 82801GHM (ICH7-M DH) rev. 02
Graphic Interface PCI-Express
PCI-E Link Width x16
PCI-E Max Link Width x16
Memory Type DDR2
Memory Size 2048 MBytes
Memory Frequency 332.5 MHz (1:2)
CAS# Latency (tCL) 5.0 clocks
RAS# to CAS# (tRCD) 5 clocks
RAS# Precharge (tRP) 5 clocks
Cycle Time (tRAS) 15 clocks
Bank Cycle Time (tRC) 21 clocks
System
System Manufacturer Acer
System Name Aspire 9510
System S/N LXABY05001626093AB2000
Mainboard Vendor Acer
Mainboard Model Kirkini
BIOS Vendor Phoenix Technologies LTD
BIOS Version V1.09
BIOS Date 07/07/2006
Memory SPD
Module 1 DDR2, PC2-5300 (333 MHz), 1024 MBytes, Nanya Technology
Module 2 DDR2, PC2-5300 (333 MHz), 1024 MBytes, Nanya Technology
Software
Windows Version Microsoft Windows XP Professional Service Pack 2 (Build 2600)
DirectX Version 9.0c

Thank you very much for your time.
Chris

Thanks a lot for the advice.

As a clarification, whats Toshiba have to do with this ? (sorry for being ignorant)

Btw, the RAM thing is correct, DDR2-667 (or any DDR) runs at half of it's 'rated' value in real life. But what it does is that it transfers data on both the rising /and/ falling edges of the clock signal, so it runs at an 'effective' 667 mhz, compared to single data rate RAM.

You're running a 32 bit OS. Nothing is wrong, it just can't address more than 4GB (including video memory and several other things). My laptop shows 3.25GB, some show 2.8. 3 is about what you'll see without going to a 64 bit OS.