Not doubting they are 280X's but 3DMark is reporting them as 7970's. Surely they are not that exact in design?
First run with the 4770k.
Cpu at 4.5ghz
Gpu 1 @1267mhz core, 3602mhz memory
Gpu 2 @1228mhz core, 3602mhz memory
Overall, 11469
Graphics, 14346
Physics, 12759
Combined, 4319
http://www.3dmark.com/fs/1027855
And added Setter