What CPU do you have ? By using all 8 slots and the maximum supported ram you may have to increase the voltage to the memory slots. The ram is rated at 1.5v but to get it to work correctly you may need to increase that to 1.575v or 1.6v. Start at 1.5v and select the next setting until it's working and showing all 64gb.
I have the Asus Rampage IV Extreme and the i7-3930K however I'm only running 16gb of ram. There is one thing on my motherboard that I notice is for the ram slots and that is a 4 pin connector that will supply extra power to the memory slots when using all 8 slots. Since you have a similar board in that it's X79 and 8 memory slots with the same maximum amount of ram, 64gb. I'm pretty sure that when occupying all 8 slots with the max amount of memory that there has to be additional voltage to those slots. I tried looking at the spec's of your board but could not see the same 4 pin connector that I have. That leads me to believe that you have to get additional voltage to the ram slots another way. You said that you tried adding voltage, how much did you add? Does the motherboard use manual say anything about using all 8 slots and the maximum amount of ram?
I have been using Asus boards for quite a few years and have found that with their tech support they are pretty good at getting back to me with responses to my questions. Perhaps you can try and ask their tech support this question.
I have a Asus P9X79 Deluxe with 64 gigs (8 sticks) of Kingston HyperX Predator 8GB 2133MHz. The board is only recognizing 32 megs. How do I get it to recognize the other 32 megs?
Thanks in advance.
There's only one model that will work and show up as 64GB or ram and all 64GB has to be purchased at the same time as the variations in the ram making process for batches differ and can sometimes cause an issue. Check the motherboards QVL and it will give you the exact model number of the ram you need to purchase and I believe the 64GB pack is true quad channel.
What's the exact model of the DRAM...and in particular is it a single set of DRAM or is it 2 or more packages? Also do you have the latest BIOS? The P9X79 can handle NUMEROUS different sets of 64GB DRAM