That should be enough.A very good psu.
for a different reading,
http://www.eteknix.com/4k-gaming-showdown-amd-r9-290x-crossfire-vs-nvidia-gtx-780-ti-sli/13/
Try the next for some temp readings,
Download the next program,
http://www.hwinfo.com/download32.html
You can open hwinfo32,after that open the sensor window by marking sensors=V,after click run,,then click at the bottom "Logging start" ,after that choose a name and place for the log.like Hwinfolog at your desktop.Leave it open and do game/stresstest or whatever you do until a crash.The log will end at that point but will be saved.
After the restart upload the log to a site without to much crap (!),for instance dropbox,and leave a link to it here.You could also look at the log yourself with either excel or libre office calc.