Some points were clean in our tests. The first one is that the Celeron G3900 is not recommended if you want to build a gaming computer, since it has not enough power to run recent games, besides its integrated video algo being too weak to run them.
Another point that was made clear is that it is a little slower than the Pentium G4400, which was expected since they are both CPUs with the same architecture, differing only by the lower clock and smaller cache of the Celeron G3900.
Compared to the A6-7400B, it was clear that the Celeron G3900 has more processing power, but the AMD CPU has a faster video engine.
Anyway, anyone who looks for a low-cost CPU like the Celeron G3900 is not looking for a processor for demanding tasks. Thus, for simple office and home applications like text editing, web browsing and even media player, it can be a good deal, because of its low cost.