Well this looks my stable peak -
https://imgur.com/a/v7X9J im worried abou that last chip having 77 temperature do u think it will be alright ?
a really nice overclock. What are your voltage settings? Your temperatures are perfectly fine. I can't give you any guarantee, but if you have cheap electricity and can handle the noise I would let it run at these speeds.
If you're worried about the last chain, you can clock that chain down a bit to i.e 575 Mhz and lower the voltage a bit too to get it to ~73 degrees as well. Let chain 1 and 2 run at the settings as they are now.
I was playing with the chain a bit but when i change voltage of 1 chain it somehows affect the others to and i get HWS / high temps ? MY current voltage settings are 20 on all chains , i tryed nearly all of the high combinations this one seems to be the most stable with 4-7 HW for hour on middle chain as i said only things that worries me is the last chain with 77 degree atm, Might aslo meantion my D3 is in ventilated room with room temp around 0 degree