Hi, I have same motherboard, CPU and RAM and also getting the code "53". I contacted Corsair Helpdesk amd got following answers:
"OK I've heard back from our product manager,
They're in contact with ASUS and ASUS is about to release a new BIOS that should support these 16GB sticks. They may have been delayed (ASUS). The BIOS that our engineers test with here is just a release candidate bios (beta). It is not available to the public.
I'm sorry that I don't have an immediate solution for you at this moment but we're left waiting for ASUS to provide the BIOS in the meantime."
and whet I asked about ETA:
"They might be behind schedule. So we should expect a rollout imminently"