AMD Epyc 7742 vs AMD Epyc 9754
SOURCE ARTICLES
Review: AMD Epyc 7742 2P Rome Server
hexus.net
The AMD Epyc 7742 2P Rome Server is part of the second-generation Epyc 7002 Series, offering double the cores and threads compared to the previous generation. It features the Zen 2 architecture, which provides higher IPC, more cache, faster memory support, improved floating-point performance, and enhanced security. The move to a 7nm process allows for more performance-enhancing transistors. The design includes a centralized I/O for reduced latency and consistent memory access. The Epyc 7002 Series also offers 128 PCIe 4.0 expansion lanes and an eight-channel DDR4 memory interface.
The Apparent Uselessness of a Second AMD EPYC 7742
forums.passmark.com
The review discusses the limitations of using a second AMD EPYC 7742 processor. It mentions that the performance of CPUs with virtual CPU cores (hyper-threading) can vary depending on the algorithms being run. It emphasizes the importance of testing and consulting the chip and compiler guides to optimize code for specific hardware. The review also highlights the need to consider factors like RAM, disabling hyper-threading, and testing with different hardware configurations to identify bottlenecks. It concludes that hardware performance is only a concern if it directly affects the specific tasks being performed.
AMD 3rd Gen EPYC Milan Review: A Peak vs Per Core Performance Balance
www.anandtech.com
The review discusses the power consumption and efficiency of AMD's 3rd Gen EPYC Milan processors compared to the previous Rome generation. The idle power consumption of the Milan parts is higher than expected, reaching up to 111W. Power tracing tests reveal that the core power consumption of the Milan chips is lower than the Rome chips in compute-heavy workloads, resulting in performance regression. The new Milan parts show a 15% perf/W regression compared to the Rome parts. The cause of this power behavior is attributed to the faster IOD of Milan. The performance advantage of the Milan parts is more pronounced at lower thread counts. However, in SPECfp2017, the advantages are less pronounced and even show performance regressions at lower thread counts. Overall, the new Milan parts have lower-than-expected generational performance improvements due to the power behavior.
AMD EPYC 7742 Benchmarks and Review Simply Peerless
The AMD EPYC 7742 is a powerful server processor with 64 cores and 128 threads per socket, making it unmatched in the market. It offers impressive per-core performance, beating Intel's Xeon lineup in many cases. The CPU features a 2.25GHz base clock and 3.4GHz turbo boost, with 256MB of onboard L3 cache. The large cache size gives it a significant advantage over Intel's offerings. The EPYC 7742 also excels in NUMA domains, providing better scalability and efficiency compared to Intel Xeon processors. It supports up to 4TB of memory and is priced competitively against standard Xeon SKUs. Overall, if you need a server with 64 x86 cores, the AMD EPYC 7742 is the top choice.
AMD Bergamo & Genoa-X EPYC Server CPUs Crush The Competition With Sheer Performance & Efficiency Dominance
AMD's EPYC Bergamo and Genoa-X CPUs have been praised for their exceptional performance and efficiency. The Genoa-X chips offer up to 96 cores and 1.1 GB of L3 cache, while Bergamo boasts up to 128 Zen 4C cores. Both CPUs outperform Intel's Sapphire Rapids Xeon CPU and offer significant power efficiency improvements. AMD's dominance in the server market is expected to continue with the upcoming Sierra Forrest and Siena lineup.
Running The AMD EPYC 9754 CPUs With A 320W cTDP To Enhance Power Efficiency Review
The AMD EPYC 9754 CPUs can be run with a 320W cTDP to enhance power efficiency. Lowering the TDP to 320W delivers similar performance across workloads while reducing CPU power consumption. The EPYC 9754 2P at 320W runs at around 99% the performance of the default 360W configuration, with up to 5% lower power consumption. This option is beneficial for maximizing power efficiency in server environments. Additionally, switching to a 400W TDP increases performance by about 6% with a 10% power increase. AMD's cTDP options allow for fine-tuning servers for maximum performance or squeezing out the most possible performance.
AMD Bergamo And Genoa-X Performance Review: EPYC Chips For Big Iron Workloads - Page 2
The review compares the performance of AMD's Bergamo and Genoa-X EPYC chips for big iron workloads. The tests were conducted using Ubuntu Server 22.04 with the 5.15.0-76-generic Linux kernel. The AMD EPYC 9754 performed well in Coremark, 7-Zip decompression, and Blender 3D rendering. The EPYC 9684X excelled in 7-Zip compression and Linux kernel compilation. In terms of video encoding, the EPYC 9654 performed best in 4K x264 encoding, while the EPYC 9754 lagged behind. For database processing, the Bergamo and Genoa-X chips outperformed Intel's offerings in both read-only and read-write workloads. However, in web server benchmarks, Intel's chips performed better, particularly in NGINX. Intel's accelerators also provided an advantage in hashing algorithms.
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AI COMPARISON
Comparison Table
| Feature | AMD Epyc 7742 | AMD Epyc 9754 |
|---|---|---|
| CPU Threads | 128 threads | 256 threads |
| Max Memory Bandwidth | 190.7 GB/s | 460.8 GB/s |
| Total Clock Speed | 144 GHz | 288 GHz |
| PCIe | 4 | 5 |
| Memory Channels | 8 | 12 |
| L3 Cache | 256 MB | 256 MB |
| DDR Version | 4 | 5 |
| L1 Cache | 4096 KB | 8192 KB |
| CPU TDP | 225W | 360W |
| Semiconductor Size | 14 nm | - |
| Turbo | 3.4GHz | 3.1GHz |
| L2 Cache | 32 MB | 128 MB |
| L2 Core | 0.5 MB/core | 1 MB/core |
| L3 Core | 4 MB/core | 2 MB/core |
| Memory ECC | Yes | Yes |
| RAM Speed Max | 3200 MHz | 4800 MHz |
| Max Memory Size | 4000GB | 6000GB |
| Multithreading | Yes | Yes |
| Cinebench R20 Multi | 20644 | - |
| Cinebench R20 Single | 398 | - |
| Geekbench 5 Multi | 15005 | - |
| Geekbench 5 Single | 725 | - |
| Passmark | 69786 | - |
| Passmark Single | 2174 | - |
| Performance per Watt | 66.68888888888888 | - |
| Blender BMW27 | 33.9 seconds | - |
| Blender Classroom | 95.8 seconds | - |
Summary
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Performance and Architecture: The AMD Epyc 7742, with its Zen 2 architecture, provides significant improvements over previous generations, featuring high core and thread counts, enhanced IPC, and strong multi-threading capabilities. The Epyc 9754, however, leverages a more advanced architecture with even higher core and thread counts, increased memory bandwidth, and better efficiency metrics, making it superior in multi-threaded tasks and efficiency.
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Memory and Storage: Epyc 7742 supports up to 4TB of RAM and has slower RAM speed limits compared to the Epyc 9754, which supports up to 6TB and faster DDR5 memory. This gives the 9754 an edge in data-intensive applications that benefit from high memory bandwidth and capacity.
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Power Consumption and Efficiency: Epyc 7742 has a lower TDP (225W) compared to Epyc 9754's 360W, indicating higher power consumption for the latter. However, the 9754's ability to tune its power settings (cTDP) for better efficiency could be beneficial in controlled environments, like data centers.
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Technological Advances: The Epyc 9754 includes PCIe 5.0 and better L2 and L3 caches per core ratios, which are pivotal for tasks requiring fast data access and transfer rates, making it suitable for more modern, high-performance computing environments.
Recommendations
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Data Centers and High-Performance Computing: Organizations needing top-tier performance, particularly in virtualization, high-performance computing, or large databases, should opt for the AMD Epyc 9754, given its superior memory capabilities and multithreading performance.
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General Server and Cost-Efficient Tasks: For businesses looking for a balance between cost and performance, especially those upgrading from older generations, the AMD Epyc 7742 offers a significant boost in performance and is still highly capable for a wide range of server tasks.
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Energy Efficiency Focus: For setups where power efficiency is crucial, the adjustable cTDP feature of the Epyc 9754 could be a deciding factor, offering flexibility not seen in the 7742.
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