i have one of my sp20 feeded by 3 psu with 18awg: corsair 550w for 2loops, 2 nonames for the other 2 loops. settings as posted yesterday:
Temp Front / Back T,B 12 °C / 55,54 °C
Fan Speed 70
Start Voltage 0.67 / 0.67 / 0.67 / 0.67
Max Voltage 0.72
Max Watts 220 / 220 / 220 / 220
Mining Rate: 1439.78Ghs
is true that ambient is pretty low, like 5-10C. cable might be warm a bit, can't really say for sure
got an dps2000bb with special board and 16awg cables. full load ~300w and cables still at room temp!
For that matter, why can't you just buy the connectors and make your own with say 14 or 12 gauge? Or is that going to cause problems with the PSU? Physically doing it is easy.
EDIT: Not sure what I did, but this was supposed to be a reply to:
Please explain, WHY are we still using PCIe connectors?
Why not give terminal points, insert wire and secure, Let me run 8awg wire straight in, less wire.
Time we move away from crappy pcie
