The point is to connect server and client directly over a new cat6 cable. A crossover cable always works as you must crossover nic to nic or switch to switch. If one of the nics or switches can do auto-crossover (not all can), you can use a 1:1 patchcable.
From your experience with the Intel X540 T2 should the 1:1 patchcable work with these NIC's and would a cat6 cable work, I though I had to use cat6A?