Intel socket LGA2066 CPUs have an embedded memory controller, meaning that the processor, not the chipset, defines what memory technologies you can have and the maximum amount of memory that is possible. The motherboard, however, may have a limitation as to how much memory can be installed.
These CPUs are compatible with DDR4 (up to 2,666 MHz) memory. According to Gigabyte, the X299 AORUS Gaming 7 supports DDR4 memories up to 4.400 MHz.
One of the highlights of the LGA2066 platform is the support for quad-channel architecture. The Gigabyte X299 AORUS Gaming 7 has eight memory slots. The motherboard supports up to 128 GiB with this motherboard if you use eight 16 GiB modules.
The quad-core CPUs, however, support only two channels. So, if you use one of these CPUs, four memory sockets will be disabled, and you can install up to 64 GiB of RAM.
In order to enable the quad-channel mode, you must install four or eight memory modules (if your CPU supports it.) When installing four memory modules, you must skip one slot between modules.
There are LEDs between the memory slots, covered by acrylic diffusers, so the memory modules are illuminated when the motherboard is powered on. There are also metal reinforcements at each slot.
Figure 4: Memory sockets; install two or four modules for the best performance