Is the Lion an preinstalled system? Does lion boot without -legacy? It should as far as I know. Unless the support for the CPU family is missing in the kernel itself.

(also, a bummer, I was going to buy a FX-6100 soon )

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My Hardware
CPU: Intel Celeron G530
Memory: 4.00 GB DDR3 1333Mhz
Graphics: NVIDIA GeForce GTX 550 Ti
OS: Mac OS X Lion 10.7.4 - Vanilla kernel
Motherboard: Gigabyte GA-H61M-D2-B3