I have a Technical question about the R909 wattage draw at the wall. Here is the history and the question is at the bottom.
In my main mining Rig shelf I have the following all plugged into a multiport powerstip / surge protector which then runs through a wattage meter before going into the Wall. ALL of the following pulls consistenly 509w to 515w depending on if I run the R909s at 575mhz or 600mhz.
1 small monitor, keyboard and mouse shared via KVM.
1 HP Server powersupply with 6pin breakout board. The R909s plug into this for power via 6pin connector.
5 small external usb fans for air flow
Mining Rig#1 - I have 3 R909s running at 575mhz and 4 Compac-Fs @460mhz with attached Bitcoin merch usb fans, mining BTC on a Raspberry Pi 4 and 2 powered hubs. The R909s into one 90w Sipolar hub and the 4 Compac-Fs into another 90w Bitcoinmerch hub. (they are identical except for branding)
Mining Rig#2 - 4 newpac's @350mhz and 2 Compac-Fs @450mhz all with attached Bitcoin merch usb fans, and one Artec bendable USB Fan.
On a separate wall area I have another rig running 3 Compac-Fs @450mhz and Bitcoinmerch usb fans and one R909 @575mhz. This one the R909 is running on a 120w power brick from Bitcoinmerch that came with my first R909. I have the R909 going into a Watt meter on its own. This one started out pulling 115w and slowly increased so far to 117w.
Last week I purchased a 5th r909 used from ebay. It hashes fine and is giving no problems, but I noticed that this one will start out pulling 15w from the wall but will slowly keep creeping up. I let it hash for 2 hours and it had creeped up to 132w. I found that odd given the power strip was supposed to be 120w. I grabbed another one i had that came with another R909 I got off of ebay and it too was supposed to be 120w, but may only be 100w (not clear on the back), but the same thing it creeped up to 125w in about an hour before I shut it down.
Then added this 5th R909 to the main shelf at the top that pulls a consistent 509w - 515w normally and it jumped to 625w and started climbing. It got to 660w after about 5 hours and again I powered that one down just to be safe. Any idea what would make the wattage use creep up like that?
Should I back off the blue dial some?