Will this be too small power supply for the rig below?

Antec 1200
Asus P6T Deluxe V2
Intel core i7-920
WD 1tb black
Sapphire radeon 5770
Coolermaster V8
G skill 6gbs ddr3 1600
Nzxt Sentry 2
LG DVD+-RW DVD SATA Writer
OCZ XTC Memory Airflow Cooler V2


antec truepower new 750w <----------PSU

You'll be fine! even with two ATI radeon HD 5770 video cards operating in crossfire mode.

The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the 12 volt rail(s) can easily power a system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current (amps) on the 12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 5XXX series cards which use less power due to their energy efficiency.

Here are the official ATI recommended power supply requirements for the new ATI Radeon HD 5770 and 5750 video cards that just became available:


450 Watt or greater power supply with one 75W 6-pin PCI Express® power connector recommended

600 Watt and two 75 watt 6-pin connectors for ATI CrossFireX™ technology in dual mode