I have just bought a new rig and it seems I'm having the rather common issue of having the wrong amount of memory detected when attempting to run the memory at its listed speed. I've tried a bunch of stuff but it seems I may have to tweak the memory settings a bit more than I'm familiar with (I'm used to the 9-9-9-24 2T type thing but not much more.)
Using the built in XMP profile the system is stable but only 12GB are detected. Downclocking the system to 1333MHz makes all DIMMS detect properly. I have confirmed it's not a memory issue as the DIMMS work individually or in pairs at the advertised speeds but once I get to 4 one will show up in the BIOS as 'Abnormal'. I have also returned one set to the store and exchanged for a new one, but the same issue is arising so I'm almost certain it is not faulty RAM or the Motherboard.
Your memory finder tool lists the ram as compatible with the settings (7-8-7-20 2T @ 1.5 volts). These settings will stop my machine from even posting at speeds over 1333MHz.
At this point I'd be happy with even getting it to detect all 4 at 1600MHz.
You can see the memory finder results here
Anyway, here's my system details:
Intel Core i7-3820 @ 3.60GHz
Asus P9X79 with lastest Bios (1103 x64)
Corsair Vengeance 16GB Quad Channel Kit (CMZ16GX3M4X1866C9R)
Corsair AX650 PSU
Any help or advice would be appreciated.