what is psu
would this be better
BFG - NVIDIA GeForce 9800 GT 1GB GDDR3 PCI Express Graphics Card
Model: BFGR981024GTGE | SKU: 9339192
1GB GDDR3 memory; PCI Express x16 interface; 2 dual-link DVI-I outputs; Forceware drivers
Powered by the GeForce 9800 GT graphics processing unit (GPU)
With a texture fill rate of 30.8 billion per second for high-quality graphics power.
1GB GDDR3 memory
With 57.6GB/sec. of memory bandwidth to provide the memory needed for visual realism.
PCI Express x16 interface
Along with a core clock speed of 550MHz and 1375MHz shader clock for high-speed processing. PCI Express 2.0 compliant.
Compatible with HD DVD and Blu-ray Disc formats
To ensure high-definition compatibility.
NVIDIA SLI technology
Allows you to connect more than 1 graphics card to your system for improved performance (additional graphics cards not included).
DirectX 10 and OpenGL 2.1-compatible GPU and powerful unified architecture
For enhanced gameplay.
Provides enhanced performance and speed, stunning visual quality and unified driver architecture (UDA) to ensure forward and backward compatibility with hardware and software.
2 dual-link DVI-I connectors
With HDTV output for easy connectivity.
HDCP-enabled HDMI support
With adapter (not included).
EcoIntelligence Low Power Design
Conserves power while providing exceptional graphics display.