Scared about using my 400w to power my new build...

I just ordered the parts to build my new PC from newegg. As I already own a 400W PSU at home I didn't order a new one in order to save some money, but I am growing increasingly worried that this unit won't be enough to "safely" power my new computer. This is my PSU right here, it's supposed to be a reliable brand at the very least... although it's the most basic offering from this company :

Now here are the specs for my new PC :

Gigabyte GA-770TA-UD3
AMD Athlon II X3 450
Radeon 5770
500GB Samsung Hard Drive
Windows 7

On a side note, I'm also wondering what would happen in the event that my Corsair PSU turns out to be insufficient to power my computer after a while ? Will it just die without damaging the rest of my hardware ? Will it go out with a catastrophic EMP shockwave that will revert my computer back to stone age ?
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  1. the corsair 400w peaks at 480w and has 30a on its 12v rail. your PC won't break 300w (probably wont break 250w) and needs 20a tops. both the athlon II and ATI 5770 are extremely efficient.

    Core i7 Test System Specs
    - Intel Core i7 965 Extreme Edition (Overclocked @ 3.70GHz)
    - x3 2GB G.Skill DDR3 PC3-12800 (CAS 9-9-9-24)
    - Asus P6T Deluxe (Intel X58)
    - Seagate 500GB 7200-RPM (Serial ATA300)

  2. ^Yup, and being a Corsair, it will automatically shut-off once you overload it to prevent any damage.
  3. Thanks a lot for the answers ! Now I can finally stop worrying about this issue :)
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