I tested this on my x220 laptop..
high performance mode.
battery-removed..
OCCT power test-- 11.67-12.5 frames per second, both tests, steady state 15mins test.
Old 2006 AC adapter (90watt),
53.5 watts @ the wall
Old 2009 AC adapter (90watt),
55.0 watts @ the wall
New 2013 AC adapter (90watt),
58.0 watts @ the wall
So the OLDER 2006 adapter is roughly 8% more efficient than the NEW 2013 adapters.
Clearly we're seeing a trend here.. the slow decline in Lenovo parts quality.
