I had that exact Pentium in my old PC and well...no comment. Made me build an AMD PC.
the G850 is a Sandy Bridge CPU, it's not an older Pentium. It preforms very ywell in gaming and would run circles are around that old LGA 1156 CPU you suggested. performance wise in gaming its only slightly slower than the i3 2100, as it is has a slightly lower locked clock multiplier, and no hyper threading (which 95% of games don't use anyway).