ASUS - Z9 Server Board Z9PA-U8

Intel Core i7 Extreme Edition 3960x Intel C600 Series

Intel Xeon E5-1600 Series Intel C600 Series

Intel Xeon E5-2600 Series Intel C600 Series

ECC UDIMMs:

Virtually any configuration up to 64GB using any combination of Kingston's 2, 4 and 8GB ECC Unbuffered modules in PAIRs.
Reg ECC DIMMs:

Virtually any configuration up to 128GB can be reached using any combination of Kingston's 2, 4, 8, and 16GB Registered modules in PAIRs or QUADs.
LRDIMMs:

Virtually any configuration up to 256GB can be reached using Kingston's 32GB Load Reduced DIMMs in PAIRs or QUADs.
non-ECC UDIMMs:

Virtually any configuration up to 64GB can be reached using any combination of Kingston's 2, 4 and 8GB modules.

If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). Maximum configurations require a 64-bit operating system.
This system supports either Registered ECC (RDIMM), ECC Unbuffered (ECC UDIMM) or Load Reduced (LRDIMM) memory using Xeon E5 series processors. Mixing RDIMMs, ECC UDIMMs and LRDIMMs is not supported within this system.
Non-ECC Unbuffered (UDIMM) memory is supported only with Core i7 3800/3900 series processors. System does not support RDIMM or LRDIMM when Core i7 processor is installed.

The Intel E5-1600 only supports ECC UDIMMs and RDIMMs.
Modules must be ordered and installed in PAIRS for Dual Channel mode, or in groups of FOUR for Quad Channel mode. Kingston offers "K2" kit part numbers for Dual Channel mode, and "K4" kit part numbers for Quad Channel mode.