Enough power?

[DrunkPenguinz]

Right now, I have a intel Q6600 and a ATI 3600. I'm switching the ATI 3600 with a r9 270, but I don't know if my power supply has enough power for it. I've opened the case and the only thing I can see is a sticker that says something along the sides of "input:100-200; output:300-400" I don't know what this means. I looked up how much power a 3600 needs, and the min. was 400 watts, and the r9 270 is about 500, but I don't think i really need 500 watts since my cpu only needs about 50 watts.

[C0LL0SS0S]

Looks like you have a prebuild PC, highly recommend getting a new PSU from a known Company like Corsair or EVGA, if you buy a new one go with 500W just so you have the upgradeability 

[nj4ck]

Do not attempt to run an even remotely high-performance GPU with the cheap chinese PSUs that come with prebuilt PCs. You can get a 400W corsair PSU for under $40 that won't blow up in your face.