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450W GPU with 400W PSU?

Hello.

I recently upgraded my graphics card and I now have my old XFX HD5770 lying around. So my dad asked me if I could install it into his computer if it was possible, fine by me.
Anyway on the box it says that the recommended psu wattage is 450W, however the PSU in my dads computer is 400W.
Can I still install the card into his computer? I've often read that people over-dimension their PSUs and the actual power usage almost never gets to the levels indicated by GPU manufacturers. I mean the PSU even has 2 PCI power connectors and the card only uses one of them. I don't wanna risk breaking anything though.
The full specs of his computer is:

Silver Power SP-400P2C 400W PSU
XFX HD4770
ASUS P5QPL-AM mATX Motherboard
Some Intel Dual Core CPU, not sure which model, thinks its like 2.5GHz or so.
2GB RAM
1 80GB IDE and 1 500GB SATA HDD
1 SATA CD/DVD player
Integrated Audio
5 answers Last reply Best Answer
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  1. joeman99 said:
    Hello.

    I recently upgraded my graphics card and I now have my old XFX HD5770 lying around. So my dad asked me if I could install it into his computer if it was possible, fine by me.
    Anyway on the box it says that the recommended psu wattage is 450W, however the PSU in my dads computer is 400W.
    Can I still install the card into his computer? I've often read that people over-dimension their PSUs and the actual power usage almost never gets to the levels indicated by GPU manufacturers. I mean the PSU even has 2 PCI power connectors and the card only uses one of them. I don't wanna risk breaking anything though.
    The full specs of his computer is:

    Silver Power SP-400P2C 400W PSU
    XFX HD4770
    ASUS P5QPL-AM mATX Motherboard
    Some Intel Dual Core CPU, not sure which model, thinks its like 2.5GHz or so.
    2GB RAM
    1 80GB IDE and 1 500GB SATA HDD
    1 CD/DVD player
    Integrated Audio


    I like some headroom with my PSU, however it's up to you. I would say upgrade to a better power supply.
  2. Best answer
    The 4770 that is in the computer now has a max draw of 80 watts. The 5770 has a max draw of 110 watts. I dont think the extra 30 watts will hurt. Chances are that system with the 5770 will never draw more than 300 from the wall total.
  3. check it out.

    http://www.techspot.com/review/209-ati-radeon-hd-5770/page11.html

    5770 with a core i7 extreme overlcocked still has a max draw of 290 at that wall. You have plenty room.
  4. Best answer selected by joeman99.
  5. This topic has been closed by Mousemonkey
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