I just bought a new graphics card (MSI GTX 770 Gaming) and the box says that minimum 600W or greater power supply and i just check my PSU and it's 550W. Do i need to upgrade my PSU with 600W+?

Thanks

just upgrade since the box write there mininum 600w.
if got money then just upgrade it.
if not dont use so many case fan first,wait u get money only upgrade.

upgrade the PSU... quite cheap nowadays...

What's your PSU model ? If it's a quality one, 550W is actually enough to power up GTX770.

Read here http://www.guru3d.com/articles_pages/msi_g...g_review,5.html
GeForce GTX 770 - On your average system the card requires you to have a 550 Watt power supply unit.

But still, we still strongly recommend you to change to 600W above as stated on the box.