In terms of overclocking ability and ease,

4.6 Ghz is to FX as 4 Ghz is to 1100t
4.8 Ghz is to FX as 4.2 Ghz to 1100t
4.9 Ghz is to FX as 4.3 Ghz is to 1100t
5.0 Ghz is to 4.4 Ghz 1100t

Plus or minus 0.1 Ghz on each for error