They did not cool the memory, only the central processor.
It is difficult to calculate how much liquid nitrogen has leaked since October 20, but it was then that the RAM module first crossed the DDR5-11000 milestone, using a liquid nitrogen tank for its cooling and working in conjunction with an Intel Core i9-13900K central processor in the form of an engineering sample. The DDR5 overclocking banner has passed to Gigabyte Technology this week, as enthusiast Hicookie of interest to the Taiwanese company has registered a new record corresponding to the DDR5-11136 mode.
Image Source: YouTube, Hicookie
The specificity of this experiment lies in the fact that a special tank with liquid nitrogen was not used to cool the memory module of the same brand, and everything was limited to a metal heat spreader. At least, this can be judged by a short video describing the moment of registration of this result. An engineering sample of the Intel Core i9-13900K this time was installed in the Gigabyte Z790 AORUS Tachyon motherboard.
Image Source: CPU-Z Validation Database
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The 16 GB memory module used timings 64-127-127-127-2, which is somewhat weaker than the October result (60-127-127-127-2), but in general, the January record is only 6 MHz higher than the autumn one. However, one can hardly dispute the fact that they were given to a Taiwanese enthusiast at the cost of great effort.