HI, I just purchased Asus X99 ROG STRIX mobo. I have used 4 x 16GB Corsair DDR4 memory which is in the QVL. As per manual, I plugged in the memory into slot A1, B1, C1, and D1 without problem. Now I want to check if slot A2, B2, C2 and D2 are are working fine for future upgrade. However I cannot make it work by using single memory on any A2, B2, C2 and D2 slot or using two/ four of them at same time. I always got Q code 53 (memory error). Is this limitation from X99 motherboard or faulty on my motherboard at even DIMM ID slots?