The i3 6100u is a 'newer' Skylake with 2 cores, 4 threads, WHEREAS the G1840 is a 2 core, 2 thread system of the Haswell architecture. Any current gen i3 (16xx or 17xx) would pretty much curbstomp a Celeron, unless said Celeron were OC'd. Hell, even PENTIUMS make jerky out of Celerons, current or no,