i currently am running a core i7 4790, an nzxt kraiken x61, r9 290, an 850 evo ssd, nzxt h440 case, 16gb ddr3. currently i have a seasonic ss500et psu and have been running this current setup for about a year. Should i be worried about my psu if im going to be putting in a brand new gtx970, meaning did i put to much stress on my psu previously? thanks