I just bought a computer with an i7 4790 and a gtx 980 in it. should i be concerned about the power supply?
that depends entirely on what power suplly you have.
That's a bit low. It might work, but saying "500W" could mean a Seasonic tier 1 500W, or a Raidmax tier 5 500W. You also need to specify which 980 you're using, as some models use much more than others. Generally I'd lean on the side of a slightly bigger unit for that setup, though. A good quality 600W-700W unit would be a good idea. The EVGA 650GS would be a nice fit.
Yes. Even a high quality one, that's under powered.
indeed. even the fearsome GTX 980 G1 uses less than 220 watts during gaming. it goes crazy if you play furmark because gigabyte forgot that all gpus must throttle in furmark after the GTX480 debacle.
Technically yes, 500w will work and Nvidia recommended a minimum 500w psu for that card, but that's the minimum. Why would you run a $600 card on the minimum requirements? I'm not gonna bother getting into why it's a bad idea even though it SHOULD work. Bottom line is that more is ideal
nvidia recommends the coolermaster extreme "500 watt", some huntkey "500 watt" or the corsair cx 500 (first version) at best with these recommedned wattage. let's not even start in on how the recommended wattage varies from manufacturer to manufacturer or even from 980 to 980 from the same manufacturer. evga's own buyer's guide say's there 500B can't run a gtx 770 or 680, but can run a 980 and Titan X (lol) even though the the 980 consumes the same or more power than the gtx 680 and do we even have to check if the Titan X does? that should tell you how valid it is right there. quality over "moar watts" all day.
RM 850 blows up with second 980, not even at 3D load: http://www.overclock.net/t/1553624/corsair-rm850-exploded-update/0_40
XFX 850 watt runs R9 295X2 better than Antec 1200 watt: http://www.overclock.net/t/1483021/official-amd-r9-295x2-owners-club/4000_40#post_23377479
more watts didn't help these people ;).
Choose tire 1 PSU
Do you just copy/paste the same answer everywhere?