Beyond 3D has posted a review of the BFG 7800 GTX card that comes default overclocked. 

The BFG Tech GeForce 7800 GTX OC is clearly a great 7800 GTX solution, offering more speed than the default configuration and a lifetime warranty as well. If you are faced with the choice between a board at the reference clocks verses the BFG board and they are still at similar prices then it appears to be a no-brainer which option to go for!