[andrewgross]

7950x3d w/ 128GB at stock timings (~3200MT/s?). Showed a high base but no increase with threads, need to investigate what is happening.

  1 54.7
  2 50.6
  3 49.6
  4 48.2
  5 47.9
  6 47.4
  7 47.1
  8 46.6
  9 46.5
  10 46.2
  11 46.1
  12 45.9
  13 45.8
  14 45.7
  15 45.7
  16 45.7
  17 45.7
  18 45.8
  19 45.9
  20 45.8
  21 45.8
  22 45.6
  23 45.6
  24 45.5
  25 45.5
  26 45.5
  27 45.5
  28 45.4
  29 45.4
  30 45.4
  31 45.4
  32 45.4

[sliken]

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

[Stagnant]

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.

[seiferteric]

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

[shivam543]

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?

[andrewgross]

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.