用$4000 砌機,打機要勁,唔lag ge,可點砌?

I suggest in the following;
AMD AM2 X2 DUAL CORE ADO5200-DO
(2.6GHz, 89W, 2MB total dedicated L2 cache, 2000MHz HyperTransport™ bus, socket AM2)
MAGIC PRO MP-AK EXTREME/AM2+ AMD 790X
-採用最新 AMD 790X 北橋晶片 + AMD SB600 南橋晶片
-支援最新 AMD AM2+ Phenom (65w / 95w) / AM2 Athlon 64 系列處理器
-支援最新 HyperTransport 3.0 技術
-支援新一代高頻寬的 PCI-E 2.0 x16 顯示卡介面
-加入 JMicron JMB363 控制晶片，提供額外 2 個 SATA2 及 1 個 IDE，並支援 RAID 0 或 RAID 1 功能
-全面採用日本頂級 Fujitsu 固態電容，能讓系統更耐用更穩定
-採用優質五相迴路供電，及密封式抗敏電感設計
-支援 ATI CrossFireX 多重 GPU 技術，可讓兩張顯示卡同時並行使用，增加運算效能
-背板加入 SPDIF-In/Out 同軸數碼傳輸及 Clear CMOS 按鈕
-備有專為超頻玩家而設的Power-on/off、Reset、Clear CMOS1 按鈕及 Debug LED 除錯顯示功能
HIS HD3870 PCI-E 512MB DDR4 IceQ3 Turbo
-Powered by Radeon HD 3800 GPU
-HIS IceQ 3 Cooling Technology
-512MB(256bit) GDDR4 memory
-Superscalar unified shader architecture
-320 stream processing units
-256-bit memory interface
-DirectX 10.1 / Shader Model 4.1 support
-PCI Express 2.0 support
-ATI CrossFireX™ multi-GPU support for highly scalable performance
-less than 22dBA
A-DATA Extreme Edition DDR-2 800+ Plus series
Mhz 2G Kit (1Gx2,CL4)
Hitachi 250GB 25V/GLA380 Serial ATA II

LG GSA-H55L 20X Super Multi DVD Writer
-DVD-R/RW: 20x / 6x
-Double Layer: 10x
-DVD+R/RW: 20x / 8x
-Double Layer: 10x
-CD-R/RW: 48x / 32x
-LightScribe
MaxPower 牛魔王 GPA420 420W 12CM/F 80PLUS
- Intelligent automatic fan speed control
- Exceed 80% efficiency at typical load operation
- Over-Power Protection / Under-Voltage Protection / Over-Voltage Protection / Short-Circuit Protection
- IntelR ATX12V V2.3 supporting +12V1 and +12V2 outputs
- Real power capacity satisfying high-end system operation
- SATA power connector
- PCI-E connector satisfying high-end graphic card requirement
Total HK$ 4,080.

intel 2 core +9600gt +2GB ram+window xp(no vista,vista can,t play 三國無雙五)