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It's a nice speed bump, but there's really not that much to see here. An FX-6350 is basically a factory-overclocked FX-6300, and an FX-4350 relates similarly to the FX-4300. While the FX-6300 has a stock clock speed of 3.5 GHz and a turbo up to 4.1 GHz, an FX-6350 bumps those to 3.9 GHz and 4.2 GHz, respectively. Naturally, this extra speed comes at a cost: the TDP is 125 W rather than 95 W.
Even so, 125 W is easy enough to dissipate in a desktop. Better yet, the "new" chips are at the same price as the old ones. New Egg in particular already has an FX-6350 for exactly the same price as the older FX-6300. While an older FX-6300 would probably have been easy enough to overclock to FX-6350 speeds, having AMD do it for you eliminates the need to mess with the overclock yourself.