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400 Watt or greater power supply recommended (500 Watt for AMD CrossFireX™ technology in dual mode)
The latter is for two HD 6450 video chipsets.
The card requires up to 100 watts - up to 8.3 amps at +12v - just for the card's video chipset.
What is the (max combined output) wattage capacity of your power supply ?
That's on it's label.
If it's less than 350 watts or so, your system may NOT boot properly, you may have NO video when the HD 6450 card is installed.
If you need a power supply with more capacity, usually you can use any standard sized standard ATX power supply.
Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.
Don't buy an el-cheapo PS.
See response 3 in this:
I no longer recommend Cooler Master, AOpen, or Sparkle power supplies.
If you ARE always getting video from the HD 6450 while booting, but NO video after Windows loads, only AFTER you have installed the specific software for it in Windows, that's easy to fix.
You MUST follow the installation directions for the card .
DO NOT point Windows to where drivers are when Found New Hardware pops up for the card !