The mobo might handle it, but have strong doubts the 6300 will, the memory controller is in the CPU and that determines what DRAM you can run, 6300s normally top out at 1866, have seen a few hit 2133, but not many....Safe bet would be 1866/9, though if the RJ Xs are priced at/near the 1866 sticks available might be worth a try, if need be can drop to 1866 and run them