I want to upgrade my Acer aspire but Am a little confused on a couple of things. To start can I use any processor I want to on my PC like an Intel i5 2500k? And if so do I need to upgrade the power supply in the PC? Thanks and here are the specs for the computer below and if anyone can recommend a processor that is under $250 and will run games like MW3 without lagging, that would be much appreciated. Thanks a lot!

Brand
Acer
Model
AX1430-UD30P (PT.SHVP2.002)
Type Home / Home Office
Processor AMD Dual Core E-450 1.65GHz
Processor Main Features
64 bit Dual Core Processor
Cache Per Processor
1MB L2 Cache
Memory
4GB DDR3 1333
Hard Drive
500GB SATA 7200RPM
Optical Drive 1
DVD-RAM/ +/- R/ +/-RW
Graphics
AMD Radeon HD 6320
Ethernet
Gigabit Ethernet
Power Supply
220W
Operating System
Windows 7 Home Premium 64-Bit

Motherboard
Chipset
AMD A45 FCH

CPU
CPU Type
AMD Dual-Core Processor
CPU Speed
E-450(1.65GHz)
L2 Cache Per CPU
1MB
CPU Main Features
64 bit Dual Core Processor

Graphics
GPU/VPU Type
AMD Radeon HD 6320
Graphics Interface
Integrated video

Memory
Memory Capacity
4GB DDR3
Memory Speed
DDR3 1333
Memory Slot (Total)
2
Maximum Memory Supported
8GB

Hard Drive
HDD Capacity
500GB
HDD Interface
SATA
HDD RPM
7200rpm

Optical Drive
Optical Drive Type
DVDRW

Communications
LAN Chipset
Integrated
LAN Speed
10/100/1000Mbps

Front Panel Ports
Front USB
2
Front Audio Ports
2

Back Panel Ports
Video Ports
1 VGA, 1 HDMI
Rear USB
4
RJ45
1 port

Expansion
External Bays
1 x 5.25"
1 x 3.5"
PCI Slots (Available/Total)
1 x PCI Express x1 Slots
1 x PCI Express x16 Slots

Physical Spec
Dimensions
14.5" x 10.6" x 3.9"