DDR5-6400 vs. DDR5-4800 R-DIMM Performance For Threadripper 9980X / 9970X CPUs

Written by Michael Larabel in Memory on 8 August 2025 at 10:40 AM EDT. Page 3 of 9. 19 Comments.

👁 Llama.cpp benchmark with settings of Backend: CPU BLAS, Model: Llama-3.1-Tulu-3-8B-Q8_0, Test: Text Generation 128. Threadripper 9980X was the fastest.

👁 Llama.cpp benchmark with settings of Backend: CPU BLAS, Model: granite-3.0-3b-a800m-instruct-Q8_0, Test: Text Generation 128. Threadripper 9970X was the fastest.

👁 Llama.cpp benchmark with settings of Backend: CPU BLAS, Model: granite-3.0-3b-a800m-instruct-Q8_0, Test: Prompt Processing 512. Threadripper 9970X @ DDR5-4800 was the fastest.

Similarly, Llama.cpp showed off the usefulness of upgrading your system memory from DDR5-4800 if you are also upgrading your Threadripper CPU.

👁 OpenVINO benchmark with settings of Model: Age Gender Recognition Retail 0013 FP16-INT8, Device: CPU. Threadripper 9980X was the fastest.

👁 OpenVINO benchmark with settings of Model: Person Detection FP16, Device: CPU. Threadripper 9980X was the fastest.

👁 OpenVINO benchmark with settings of Model: Weld Porosity Detection FP16-INT8, Device: CPU. Threadripper 9980X was the fastest.

👁 OpenVINO benchmark with settings of Model: Person Vehicle Bike Detection FP16, Device: CPU. Threadripper 9980X was the fastest.

👁 OpenVINO benchmark with settings of Model: Machine Translation EN To DE FP16, Device: CPU. Threadripper 9980X was the fastest.

👁 OpenVINO benchmark with settings of Model: Road Segmentation ADAS FP16-INT8, Device: CPU. Threadripper 9980X was the fastest.

👁 OpenVINO benchmark with settings of Model: Noise Suppression Poconet-Like FP16, Device: CPU. Threadripper 9980X was the fastest.

👁 OpenVINO GenAI benchmark with settings of Model: TinyLlama-1.1B-Chat-v1.0, Device: CPU. Threadripper 9970X was the fastest.

For many of the OpenVINO AI benchmarks was also clear-cut advantages to pairing the Threadripper 9000 series with DDR5-6400 memory.

👁 Palabos benchmark with settings of Grid Size: 100. Threadripper 9980X was the fastest.

👁 High Performance Conjugate Gradient benchmark with settings of X Y Z: 104 104 104, RT: 60. Threadripper 9980X was the fastest.

👁 RELION benchmark with settings of Test: Basic, Device: CPU. Threadripper 9980X was the fastest.

👁 Graph500 benchmark with settings of Scale: 26. Threadripper 9980X was the fastest.

In some of the memory intensive HPC benchmarks the DDR5-6400 memory was very much needed to prevent starving the CPU cores and constraining their performance.

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URL: https://www.phoronix.com/review/threadripper-9000-ddr5-6400-4800/3

⇱ DDR5-6400 vs. DDR5-4800 R-DIMM Performance For Threadripper 9980X / 9970X CPUs - Phoronix

DDR5-6400 vs. DDR5-4800 R-DIMM Performance For Threadripper 9980X / 9970X CPUs