Can the HD 5450 graphics card run on my 305W psu?

Ok so im looking to buy a ati radeon HD 5450 512mb graphics card ive heard that on the box it says it needs a 250W power supply but i want to be sure so i don'dt overheat/explode my computer my specs are pentium 4 3.8ghz
3gb RAM
160gb hard drive
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