I have 4 x 16GB Corsair Vengeance. Thus, it's 64GB.
The funny thing is that, the RAM stick can only works in slot A, C, E, G. If I stick it in slot B, D, E, H the computer won't recognize it and it makes the 'no memory attached' beep.
As attached:
http://postimg.org/image/pahv0x96p/