305w power supply enough for two hard drives (and other components)?

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Jan 27, 2012
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Is a 305w power supply in my Dell Optiplex Mini Tower enough for two hard drives (both WD SATA 6 HD's, one 80GB and another 1TB), a video card (ATI Radeon 6450) an ASUS PCI sound card and 4 GB DDR2 Ram?

Also, would I require a bigger fan to cool off the PC or not for all the above components listed?
 
Solution
You probably would be okay.. But you would be cutting it close.

No you don't really need an extra fan.

If you wanna buy something get a PSU of 400W just to be safe.