顯示卡選擇

我想買顯示卡, 睇上兩張, 哪一張好?
XFX GeForce 8600 GT Video Card - 512MB DDR3, PCI Express, SLI Ready, (Dual Link) Dual DVI, HDTV, Video Card
* Intel® or AMD® compatible motherboard
* At least 512MB system RAM
* PCI Express® compliant motherboard
* A minimum 300W system power supply
* 50MB of available hard disk space
* CD-ROM or DVD-ROM drive
* Microsoft® Windows® 2000, XP or Vista
* VGA or DVI-I compatible monitor
Core Clock: 540 MHz
Memory Clock: 1180 MHz
Stream Processors: 32
Memory Bandwidth: 22.4GB/sec.
和

EVGA GeForce 8600 GTS Video Card - SSC Edition, 256MB DDR3, PCI Express, SLI Ready, (Dual Link) Dual DVI, HDTV, Video Card
Minimum System Requirements

* Intel® or AMD® compatible motherboard
* At least 512MB system RAM
* PCI Express® compliant motherboard
* A minimum 300W system power supply
* 50MB of available hard disk space
* CD-ROM or DVD-ROM drive
* Microsoft® Windows® 2000, XP or Vista
* VGA or DVI-I compatible monitor
Video Memory: 256MB
Core Clock: 756 MHz
Memory Interface: 128-bit
Memory Clock: 2140 MHz
Memory Bandwidth: 34.2GB/sec.
第一張是8600GT 512MB GDDR3,
第二張是8600GTS 256MB GDDR3 超頻.

我的電腦(HP m8226x)
AMD Athlon 64X2 6000+
3072 MB DDR2 RAM
Window Vista 32-bit
Nvidia GeForce 6150se chipset 430
300Watt Power Supply