accidently i found 7.4/5.5mm DC adatper to 5.5/2.5 DC so i decided to make adapter for my acer z35 (2560x1080 200Hz G-sync)
power consumption:
brightness:
0% - 27W
100% 61W
so very low
i set it for 50% bcoz its perfect for me - i got 38-41W -so from 12V, even with loses on convert max should be 4A from 12V)
PC + ACER (with stock PSU) - desktop with some soft idling - 170-171W
PC + ACER with my converter - 171-172,5W
so basicly the same consumption
advantage is that - in standby mode i got 1,5W with converter, acer with stock psu/brick take 13-15W in stndby - O_O
some pics