i expect the N100 to be faster(on my tests the ARM board can’t make use of even 50% the ram bandwidth
There’s an issue that was noticed with the DDR v1.16 init code that makes RAM super slow (at least DDR5), but we don’t know if the source of the problem was well identified yet. In short, there was a setup (1.11 or so) with where DDR5 was set to 5472 MT/s that was apparently fine, but for “stability reasons” (as indicated in the commit message) it was reduced to 4800. But while doing so, something else was clearly changed because the RAM’s performance was cut by 2.5 or so (for DDR5 as well). The problem is that it’s the same file that brings DDR4 and DDR5 timings and since it’s unclear what was changed I don’t know if it’s possible that some rock5b are shipped with this version and are affected with the issue. At least rock5-itx’s ddr5 is seriously affected, and my old rock5b is running perfectly fine (I don’t know on which version). Maybe the issue only affects ddr5 (we can hope so), maybe it affects something else that is used to build these binary files and could affect the two versions.
I guess running sbc-bench on your machine and comparing the results with other public ones will tell you if your machine works as expected or is slower.