SiSoft Sandra Memory Bandwidth
SiSoft Sandra is a synthetic benchmark, but we wanted to illustrate how much more memory bandwidth you get with the eight-channel controller compared to quad-channel. So we compared the Gigabyte MW32-SP0 / Intel Xeon E 2176G combination to the Armari Magnetar S16T-RW850G2, which includes an AMD Threadripper 1950X with quad-channel memory, and Gigabyte MZ01-CE0 motherboard with an AMD EPYC 7551P, which supports eight-channel memory.
Unsurprisingly, the Gigabyte MW32-SP0 has half the bandwidth of the AMD Threadripper 1950X's quad-channel configuration, and a quarter that of the EPYC 7551P's eight channels. But it's no worse than that, so you're only losing from having dual memory, with the performance within what you'd expect given this limitation.