I have planned my new build and I just wanted to be sure if I am going with right power supply so there's no problems.
Processor - Intel Core i3-2100
Mobo - Intel DH67BL
RAM - Corsair Vengeance 4 GB (4 x 1) (will upgrade to 8 (4 x 2) GB in a few weeks)
HDD - Samsung 250GB x1
Optical Drive - (1) DVD-RW
Sound Card - Creative Sound Blaster 24-bit (on PCI)
Graphics Card - Sapphire HD 6850 O.C. (no tweaking with voltage, just memory/gpu clocks through afterburner) No crossfire now or in the future
Cooling - 3 x Blue LED 120mm (1200RPM) Cooler Master fans + 1 120mm generic fan (700 RPM)
Chassis - Cooler Master Elite 430
For a system using a single Radeon HD 6850 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 25 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important.
The Corsair Builder Series CX600 V2 (CMPSU-600CXV2), with its +12 Volt continuous current rating of 40 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 6850.