7950x with 4x32GB @ 3800MHz here. Getting similar results except my single thread performance is the worst (around 40), otherwise it looks almost identical. I assume my poor single thread perf is due to having capped max CPU core clock at 4.5Ghz. Getting 4 sticks to boot was a pain, haven't really bothered to change anything once I finally got it running stable.

7950x with 32GB @ 6000MT/s:

    1 52.6
    2 78.1
    3 71.0
    4 74.3
    5 71.3
    6 72.5
    7 70.0
    8 69.6
    9 68.4
    10 68.7
    11 68.5
    12 68.3
    13 68.3
    14 68.0
    15 67.8

For 2 x 3200 MHz, 51.2 GB/s is the theoretical limit. I guess your single core is good enough to use all bandwidth. How many RAM sticks do you have?

4 x 32GB for now. I need to investigate manual OC as EXPO doesn't work with all 4 slots populated. Another option is to try the 192GB 4x48GB Corsair kits at 5200.

Ryzen 9 7900 2x48GB AMD recommends DDR5-6000, so I underclocked DDR5-6400 to DDR5-6000. The 96GB ram was under $300.

$ ./a.out

  1 59.2 
  2 76.9 
  3 66.8 
  4 68.7 
  5 64.0 
  6 67.1 
  7 63.9 
  8 66.0 
  9 64.0 
  10 65.6 
  11 64.0 
  12 65.5 
  13 65.6 
  14 66.0 
  15 66.0 
  16 65.8 
  17 65.1 
  18 65.2 
  19 65.1 
  20 65.4 
  21 64.6 
  22 65.2 
  23 65.5 
  24 65.2