You need a bigger PSU or that thing may not even run. Those bigger, better cards need at LEAST 500-600watt PSUs, and count in everything else (The Q6600's 90watt consumption, etc.) and you should at least get ~800watt.
but I already bought the powersupply
And i just did this and it says there 450 watt powersuply would be enough,
http://www.corsairmemory.com/psufinder/results.aspx?cpu_id=325751&vc_id=606499&card_count=1&hd_num=325801&cpu_oc=True&cpu_oc_ex=False&vc_oc=TrueAnd I did another test and got this:eXtreme PSU Calculator v2.5
Send To Printer Back To Calculator
Notes: (Only text visible within note field will print.)
here is the thing i did.
System Type: Single Processor
Motherboard: High End - Desktop
CPU: Intel Core 2 Quad Q6600 G0 2400 MHz Kentsfield
Overclocked: 3200 MHz, 1.45 V
CPU Utilization (TDP): 85% TDP
RAM: 2 Sticks DDR2 SDRAM
Video Card: ATI Radeon HD 4850
Video Type: Single Card
SATA HDD: 2 HDDs
DVD-RW/DVD+RW Drive: 2 Drives
Sound Blaster - All Models: Yes
USB: 4 Devices
IEEE-1394 FireWire: 1 Device
Cold Cathodes: 4 Cathodes
Water Cooling Kit: Swiftech H20-120 Premium
Keyboard and mouse: Yes
System Load: 90 %
Recommended Wattage: 429 Watts
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http://www.extreme.outervision.com/PSUEngine1 of 1 8/15/2008 10:26 AM