It will really depend on the configuration of your rig for the card that has a 72c temperature maybe some of your cards are close to each other, but 72c is not bad by any means as long as the card is not spiking up around 80c+ plus you ambient room temperature.
I tested them individually on the rack, it actually hit 72C all by itself. I tried reverting it back to stock BIOS and underclock both cpu/mem, and it was doing about 24MH/s at 64C. Not sure if its just silicon lottery or there is something I can tweak?
Above 70C is not that bad but not that good either.
I guess 60-70C is the good temps, the lower the temps the better it is.
Anyway, add -cvddc 900 in claymore bat file and don't do MSI undervolting. You'll see better results.
thanks for the tip! will give it a try.. I tweaked most cards to 1000 mV (GPU) but there is one card that couldnt run stable at that voltage when overclock/one-click patched so I had to leave that one at stock voltage. Thats also the card that runs up in temp.