i've been able to get ~1.1 TH stable on my single chip bitaxe supra, been running it over a week with no issues. def not with the stock PSU though, i got a 5V switching power supply off amazon. nothing fancy for cooling. literally just an extra arctic USB fan pointed at it.

settings:
850 Mhz
1350 core voltage
Temps: 65-68° C
Power: 27W-30W (not including extra fan)

Ambient/Room Temp: 70-80° F

pretty sick ngl. was also able to take a bitaxe ultra to over 700 GH with similar settings.