After 5 years of stirling service and a lot of modifications I'm retiring my rig of 8 x 1070's. My remaining 2 rigs, each with 8 x 1070ti's are running at around break even so will keep them spinning a few more months, at least until the Australian winter is over.
I have special software that can enhance the profit of old Pascal/Turing mining rigs. Send me a PM if you're interested. I already doubled profit on my Tesla P100 rig, keeping it operational instead of having to sell.