AMD Announces 7950X3D, 7900X3D Upto 128MB L3 Cache

Re:AMD Announces 7950X3D, 7900X3D Upto 128MB L3 Cache by skirmish on Thursday January 05, 2023 @06:35PM (#34268583)

That's my understanding, yes. All my knowledge is from random Reddit threads however.

Since I was scared off 128 GB by all those complaints, I built a 7950X system with 2*32GB memory, and it runs well/stable at its rated 6000 MT/s with EXPO on (also, AMD says 6000 MT/s is the sweet spot for AM5 memory interface, so I am happy).

Motherboard: ASRock X670E Steel Legend

RAM: G.Skill Trident Z5 Neo 64 GB (2 x 32 GB) DDR5-6000 CL30

Here is another thread I remember reading: https://old.reddit.com/r/hardware/comments/za0x0q/level1tech...

[ Parent | on HN ]

Re:AMD Announces 7950X3D, 7900X3D Upto 128MB L3 Cache by injinj on Thursday January 05, 2023 @10:49PM (#34270731)

That's what I got (7950x steel legend), except that I'm running 128GB memory at 4800.

Here's my stream results (with the cpu in 105watt "eco" mode):

  $ wget https://www.cs.virginia.edu/stream/FTP/Code/stream.c
  $ gcc -O3 -fopenmp stream.c
  $ a.out

  Number of Threads counted = 32

  Copy:           45571.7
  Scale:          40672.0
  Add:            45317.3
  Triad:          42759.0

With array size 8,000,000

  Copy:           31551.3
  Scale:          30983.7
  Add:            34403.6
  Triad:          34484.1

[ Parent | on HN ]

Re:AMD Announces 7950X3D, 7900X3D Upto 128MB L3 Cache by skirmish on Friday January 06, 2023 @12:11AM (#34271230)

Interesting, didn't think memory speed will make so much difference but it did.

7950x X670E Steel Legend, standard mode, 2*32 GB = 64 GB RAM at 6000, CL 30.

    Array size = 1,000,0000

    Copy:           61488.8
    Scale:          55905.4
    Add:            61320.2
    Triad:          57706.5

    Array size = 8,000,0000

    Copy:           43631.0
    Scale:          43062.7
    Add:            46782.6
    Triad:          46966.8

[ Parent | on HN ]

Re:AMD Announces 7950X3D, 7900X3D Upto 128MB L3 Cache by injinj on Friday January 06, 2023 @01:15AM (#34271589)

Wow, that's significant. I may have to look into that.

[ Parent | on HN ]