Go on chips and cheese site, they say that there is quite bit more trips to RAM,
Could be the higher RAM bandwidth that helps the CB2024 renderer.
LTT posted Threadripper 7000 results a) with quad-channel and b) dual-channel RAM. I am not sure if it was DDR5-5200 or -6400 in those tests, seemingly the latter.
(source:
https://www.youtube.com/watch?v=WE9NIZShfZY&t=355s – "It’s Back and I’m SO Excited! - Threadripper 7000", 5:55 "Dual Channel Memory Results")
Cinebench 2024 multi-core,
7980X quad channel ............. 5,605 points
7980X dual channel .............. 5,146 points (-8 %)
7970X quad channel ............. 3,669 points
7970X dual channel .............. 3,522 points (-4 %)
A more traditional image rendering benchmark for comparison,
Blender 3.6.5 LTS Barbershop,
7980X quad channel ............. 197 s
7980X dual channel .............. 197 s
7970X quad channel ............. 320 s
7970X dual channel .............. 319 s
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Normally I don't watch stuff like that, but the video came up when I looked for something else and the dual channel chapter title seemed interesting.