This 64GB RAM is 100% compatible with the ASRock Fatal1ty X99X Killer.

What memory configuration is possible?

Memory for Core i7 5th Generation CPU: Optimal performance is achieved with 4 or 8 identical memory modules per CPU. If an i7 processor is used, UDIMM memory modules must be installed.

Memory for Xeon CPU: When using a Xeon CPU, ECC and RDIMM memory must be used. ECC DIMM (with Error-Correction Code) or RDIMM (Registered DIMM) RAM can be installed in the device. RDIMM memory is recommended when large memory capacities are to be achieved. The different memory technologies (ECC / RDIMM) must not be mixed. If a memory expansion is to be made with the already existing RAM, it must be checked which memory technology (ECC / RDIMM) is present.

CPU in the system:

• UDIMM
• UDIMM ECC
• RDIMM

Which memory technology can be used, depending on the CPU:

• Core i7-5960X
• Core i7-5930K
• Core i7-5820K
• 4GB UDIMM
• 8GB UDIMM
• 16GB UDIMM
• 32GB UDIMM

• Xeon E5-1600 v3
• Xeon E5-2600 v3
• 8GB UDIMM ECC
• 8GB RDIMM
• 16GB RDIMM
• 32GB RDIMM
• 64GB RDIMM DDP
• 128GB RDIMM 3DS
• 256GB RDIMM 3DS.