Cards: 4x EVGA 1080 Ti FTW3 Efficiency: ~4.6 Sols/W
If you run this at 2.8 sols/W you must have very cheap electricity costs.
How did you achieve 4.6 Sols/W , i can't get anything above 3,85 even with heavy OC and very low TPL.
If i put mine at 50% power limit +150 core and +350 memory i hit over 4.7SOL/W
At 50% power limit it's possible, I've tried some tests and got around 4.5-4.6 sol/w. But I still push my rig run at power limit around 75-82%, I want to get the better ROI/cost more than that efficiency (the electric cost here is about 0.08$/kwh).