Looks like the ES of 3950Xwas OCed to 4.3Ghz all core with just AIO :-)
Overclocked result using AIO water cooler on X470 internal reference board. Board has no bus clock tuning capability. Ryzen 9 3950X engineering sample used. Many people (including press members) witnessed 3950X overclocked performance demonstration at AMD Tech Day on June 8th, 2019 World record re-broken in AMD lab to upload result as required by HWBOT rules
How can it match Quad channel memory in memory bandwidth of 7960X on X299 in same frequency?