not really. you have 8x dual channel - or 2x 8 channel in best case.
its hard to get a single socket board to have 8 channel interleaving, and will be impossible on dual socket boards.
Decided to google again for memory related performance tests, I've compared Conjugate Gradient benchmark (sensitive to cache and memory, but not sure where it's bottlenecking between those two) from results pictured
here:
CPU/Score (core/threads/Base Ghz)
8380 1P = 20.65 (40/80/2.3)
8280 2P = 28.98 (28/56/2.7 x2)
8490H 1P = 31.24 (60/120/1.9)
8592+ 1P = 35.42 (64/128/1.9)
8380 2P = 40.31 (40/80/2.3 x2)
8490H 2P = 60.42 (60/120/1.9 x2)
8592+ 2P = 70.95 (64/128/1.9 x2)
And it feels like if we check performance adjusted for core counts and memory frequencies - results attributable to better memory (channels, frequencies, DDR4toDDR5) aren't revolutionary different, even arriving to a conclusion what personally to me further investment into neither Sapphire nor Emerald Rapids are not even close to be justifiable at current ebay prices (despite Prod stepping QS and $ being multiples below Intel's advised prices), I mean I have it already for back then affordable price but won't be upgrading in near time to Dual-socket variant.