Why is the 1700+ still the king over the 2500-M Barton? Because the 1700+ will o/c from 1.4ghz to 2.2ghz without even increasing the voltage one point. The 2500-M, on the other hand, requires voltage to get any O/C, which results in hotter temps, higher fan speeds (for air only), and overall a louder, hotter system.