12-21-2020, 12:47 PM
Dropping to 900 kH/s from 1 MH/s after 8 hours seems normal to me, because it is just not possible to maintain the boost clock you are seeing in the first couple of seconds. You will also lose performance as the card heats up and consequently also your room has probably heated up after 8 hours. You could try to set your GPU fans and also chassis fans to 100% speed to squeeze out a little extra performance.
Although 71 Celsius doesn't seem that much, it is possible that the OEM of your card has set this as a target temperature in the firmware of the card. Since an OEM doesn't want to have a "loud" card, it may also limit the boost clocks (i.e. power consumption) a little instead of ramping up the fans to 100%, which obviously drops performance. I can see the same behavior on my KFA2 (/Gallax) 2070 Super.
Although 71 Celsius doesn't seem that much, it is possible that the OEM of your card has set this as a target temperature in the firmware of the card. Since an OEM doesn't want to have a "loud" card, it may also limit the boost clocks (i.e. power consumption) a little instead of ramping up the fans to 100%, which obviously drops performance. I can see the same behavior on my KFA2 (/Gallax) 2070 Super.