請問點樣加RAM的??同埋去邊到買較好??

我想問我部電腦可以加邊隻RAM...
本身得512MB...想加到1GB以上可以玩到現時新出的GAME...
同埋想問係邊到買比較好??價錢大約幾多呢??
因為成日要用電腦...加上屋企附近冇咩電腦鋪...唔想比人整...
買左番黎自己裝過程會唔會好複雜??係咪放左入去就用得??
始終自己冇砌過機...唔敢亂黎...=.=
好似太多問題了...但係依家有隻GAME好想玩...=.=
想快d搞左佢...
以下係電腦cpu資料
中央處理器Socket 478 for Intel Pentium 4/Celeron
Intel Hyper-Threading Technology ready
Supports Intel Prescott CPU 晶片組Intel 865PE
Intel ICH5 前側匯流排800/ 533/ 400 MHz記憶體- Dual Channel Memory Architecture
- 4 x 184-pin DIMM Sockets support max. 4GB PCPC3200/2700/2100 non-ECC DDR SDRAM memory
- ASUS Hyper-Path Technology 擴充插槽1 x AGP8X/ 4X (0.8V, 1.5V only)
4 x PCI 儲存裝置 / 磁碟陣列2 x UltraDMA 100
2 x Serial ATA 音效功能ADI AD1888 SoundMAX 6-channel CODEC
support S/PDIF out interface 網路功能Realtek 8100C 10/100 Mbps Ethernet controller超頻功能AI Overclocking:
- Intelligent CPU frequency tuner
- ASUS JumperFree
- SFS (Stepless Frequency Selection) from 100MHz up to 400MHz at 1MHz increment
- Adjustable FSB/DDR ratio. Fixed AGP/PCI frequencies.
- ASUS C.P.R.(CPU Parameter Recall) 獨特功能Power Loss Restart
support S/PDIF out interface
Chassis Intrusion
ASUS EZ Flash
CrashFree BIOS 2 背板 I/O 埠1 x Parallel
1 x Serial
1 x PS/2 Keyboard
1 x PS/2 Mouse
1 x SPDIF out
1 x Audio I/O
4 x USB 2.0
1 x RJ45 內建I/O連接孔2 x USB 2.0 connector support additional 4 USB 2.0 ports
CPU / Chassis FAN connectors
20 pin ATX Power connector
4 pin ATX 12V Power connector
Chassis Intrusion
S/PDIF out connector
CD / AUX audio in
Front Panel Audio connector
COM2 connector
GAME/MIDI connector BIOS3 Mb Flash ROM,AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.3管理能力 WfM 2.0,DMI 2.0,WOL by PME,WOR by PME, Chassis Intrusion支援光碟Drivers
ASUS PC Probe
Trend Micro PC-cillin Anti-virus Software
ASUS LiveUpdate Utility 相關配件User's manual
2 x Serial ATA cable
1 x UltraDMA 133/100/66 cable
FDD cable
I/O shield 體積ATX Form Factor 12"x 8.2"(30.5cm x 20.8cm)