i5 2310, I got it for cheap a year or two ago to upgrade my i3 2100.
I could use something faster, but all new parts are to expensive (the things that are actually a big upgrade all around), specially now that Skylake OC is dead (and I would not be willing to get it without power saving states and being locked to Z motherboards anyway), I will not be surprised if I keep it for another 3 years or more at this point,
funniest part is my h61 motherboard, when new it was bellow your typical $40 board, but it's still going strong after all those years.