Gigabyte GA270X gaming K5 Motherboard won't POST with 64GB DDR4-3200 installed.

I had one set of two sticks of DDR4-3200 16GB, CMK32GX4M2B3200C16, so 32GB total. This worked fine when I put them in slot 1 and 3 (I realised I was running them in single channel). Now I got another same set so that I have a total of 64GB (4x16GB). However I noticed that the motherboard won't POST with any of these sticks inserted into any of the channel A slots (slot 2 and 4). having 1 stick in either slot 1 or 3, or two sticks in 1 and 3 does work. With any of the other RAM configurations it fails in the same way. there are four LEDs on the motherboard which indicate the boot step. CPU, RAM, VGA, BOOT. When it fails to POST, CPU lights up, then it switches a few times between CPU and RAM, then all motherboard RGB LEDs go red, and then the system restarts. Obviously I disconnected all storage drives and pcie devices so they play no role. Is my motherboard faulty? any way to make it work with all RAM sticks?