Yeh except for the price you can get 2 for the cost of a 280X or similar with 2nd. And use less then 80w
And pay for 2x as many motherboards, CPUs, DIMMs, cases, risers etc to get the same total hash power.
If you are only talking about a single 280X not multiple. Then why would you need 2 full systems?
My recommendation wasn't aimed at those of us that use 3 or 4 gpus per system
I just bought 2 750ti superclocked. I'm excited because the Maxwell architecture has not been touched yet in cudaminer. While the old titan architecture is implemented to run maxwell currently; Hopefully there will be further updates that will undoubtedly increase hash power as the new architecture is brought into cudaminer. Plus at the moment they will replace my gtx580 for a third of the watts and double the hash rate. In Keccak they will get 5 times the hash rate of my gtx580 overall they are a complete win for me. Remember the most important part of maxwell implementation is the integration of an arm cpu onto the card along with the stream procs, and that in cuda 5.5 the int swap was finally fully implemented.