https://wccftech.com/adata-takes-the-title-of-faster-ddr4-ram-at-5634-mhz/

Adata is a well-known brand in the memory segment of the computer market and they just dethroned HyperX to have the fastest DDR4 RAM on the planet. Over at Adata’s XPG Overclocking Lab (XOCL), they have managed to overclocked the brand’s RGB-lit Spectrix D60G memory to a crazy high clock speed 5,634.1 MHz (2 x 2817.1 MHz). This was recorded by HWBot, and it has dethroned the reigning champ, the HyperX Predator as the fastest DDR4 memory on earth.

The Spectrix D60G was a single 8GB was paired with an i9-9900K with MSI’s MPG Z390I Gaming Edge AC Mini ITX. Realistically, this is not possible without dabbling with exotic cooling, so they used liquid nitrogen. When it comes to breaking world records, everything goes out the window and all that matters it reaching the clock speed you were aiming for. Especially efficiency, the lab had very loose timings that would not be practical. Those CL timings were CL 31-31-31-46 3T. I would have to expect they were using a very high voltage, somewhere around two volts.