Stock frequency on a Phenom x3 8400 IS 2.1GHz. You should be able to overclock to 2.4ish if your cooling is up to snuff... hopefully by just kicking the multiplier. Without knowing your motherboard it would be hard to tell you how, but... => http://www.tomshardware.com/forum/259903-29-overclocking-benchmarking-guides
Stock frequency on a Phenom x3 8400 IS 2.1GHz. You should be able to overclock to 2.4ish if your cooling is up to snuff... hopefully by just kicking the multiplier. Without knowing your motherboard it would be hard to tell you how, but... => http://www.tomshardware.com/forum/259903-29-overclocking-benchmarking-guides
That isn't stone age, 386 and 486 is stone age. I got a 8250e that I got running at 2.7ghz so you might get lucky to go over 2.4ghz knowing the stock power consumption that is around 95w and most boards top out at or before 140w.