AMD EPYC 9755 vs AMD Ryzen Threadripper 9970X Comparison

The AMD EPYC 9755 and AMD Ryzen Threadripper 9970X represent two very different interpretations of AMD’s Zen 5 architecture. Both are active production parts built on the same 4nm TSMC process, but they are aimed at entirely separate workloads. The EPYC 9755 is a 128-core server behemoth designed for massive parallel throughput, while the Threadripper 9970X is a 32-core desktop part that trades raw core count for much higher clock speeds and single-thread performance. The benchmark data in the database draws a clear line between them: the EPYC wins nine of eleven head-to-head tests, but the Threadripper takes the two single-thread tests by a significant margin. This is not a case of one being objectively better; it is a case of picking the right tool for the job.

Where Each One Wins

The AMD EPYC 9755 is the undisputed king of multi-threaded throughput. Across every multi-core workload recorded in the database, the EPYC 9755 leaves the Threadripper 9970X in the dust. The largest gap appears in the physics test, where the EPYC scores 27,806 against the Threadripper’s 6,835, a difference of 306.8%. Similarly, in integer math, the EPYC posts 1,549,946 versus 465,378, which is 233.1% higher. Data encryption shows a 228.4% advantage (284,927 versus 86,765), and prime number finding is 232.8% ahead (2,047 versus 615). These are not small margins; they are multiples of the Threadripper’s performance. The EPYC also wins floating-point math by 198% (922,900 versus 309,719), random string sorting by 198.4% (571,185 versus 191,445), and extended instructions by 113.1% (303,321 versus 142,342). Even the multithread test, which is a more general measure, shows a 54.9% lead (166,328 versus 107,399). If the workload is heavily parallel, the EPYC 9755 is the clear winner, and the data leaves no ambiguity.

The AMD Ryzen Threadripper 9970X wins only where single-thread performance is the deciding factor. In the single-thread test, it scores 4,530 compared to the EPYC’s 3,503, a 22.7% advantage. That same result appears twice in the database (listed under slightly different test names), so it is not a fluke. The Threadripper’s higher base and boost clocks (4.00 GHz base, 5.40 GHz boost versus 2.70 GHz base, 4.10 GHz boost) directly explain this. For workloads that cannot use more than a handful of cores, such as certain simulation engines, legacy applications, or latency-sensitive tasks, the Threadripper 9970X is the better choice. It also has a 99th percentile rank among all CPUs, meaning it sits at the very top of the database’s overall performance distribution, though the EPYC 9755 sits at the 100th percentile.

The Verdict

Pick the AMD EPYC 9755 if your work is defined by massive parallel scaling. The database shows a 128-core, 256-thread part with a 512 MB shared L3 cache, twelve-channel DDR5 memory, and 576.0 GB/s of memory bandwidth. It is built for server and workstation racks where the goal is to chew through enormous datasets, batch processing, virtualization, or rendering farms. Its average benchmark score of 505,778 places it above the EPYC 9745 by 18.7% and above the Ryzen Threadripper PRO 9995WX by 22.7%. It also edges out the EPYC 9845 in the database’s rival list, though only by a 3.4% margin in the wrong direction (the 9845 scores slightly higher on average). If you need maximum throughput on a single socket, this is the part.

Pick the AMD Ryzen Threadripper 9970X if your workload is single-thread sensitive or if you need high clocks with a reasonable number of cores. The database shows a 32-core, 64-thread part with a 4.00 GHz base clock and 5.40 GHz boost, which is dramatically higher than the EPYC 9755’s clocks. Its single-thread score of 4,530 is 22.7% higher, and that advantage matters for interactive desktop use, code compilation with many small tasks, or professional applications that are not perfectly parallel. The Threadripper also has an unlocked multiplier, so it is designed for overclocking, and its 350W TDP is far easier to manage than the EPYC’s 500W. Its average benchmark score of 279,778 is essentially on par with the Intel Xeon 6780E (only 0.2% behind), and it sits slightly below the EPYC 9565, the Intel Xeon 696X, and the EPYC 9555P in the rival list. However, its single-thread capability and desktop platform make it the better fit for a workstation that also serves as a primary machine.

Head-to-Head Benchmarks

The biggest win for the EPYC 9755 is in the physics test. It scores 27,806 versus 6,835, a delta of 306.8%. That is more than four times the Threadripper’s result, and it highlights the EPYC’s advantage in simulations that scale across cores. Integer math is nearly as dominant: 1,549,946 versus 465,378, a 233.1% lead. Prime number finding shows a 232.8% gap (2,047 versus 615), and data encryption is 228.4% higher (284,927 versus 86,765). These are all compute-heavy, parallel workloads where the EPYC’s 128 cores simply overwhelm the Threadripper’s 32.

Random string sorting is another large gap at 198.4% (571,185 versus 191,445), and floating-point math is 198% higher (922,900 versus 309,719). Extended instructions show a 113.1% lead (303,321 versus 142,342), and data compression is 157% ahead (4,517,407 versus 1,757,998). Even the multithread test, which is a broad measure, shows a 54.9% advantage (166,328 versus 107,399). In every single multi-threaded workload in the database, the EPYC 9755 wins by at least 54.9%, and often by more than 200%.

The Threadripper 9970X’s only wins are the two single-thread tests, both showing 4,530 versus 3,503, a 22.7% margin. That is a substantial lead for single-thread performance, and it is consistent with the clock speed difference. The Threadripper’s boost clock of 5.40 GHz is 31.7% higher than the EPYC’s 4.10 GHz, which explains the gap. For any workload that depends on a single core, the Threadripper is faster, but for everything else, the EPYC dominates.

FAQ

Q: Which CPU has more cores?

A: The AMD EPYC 9755 has 128 cores and 256 threads, while the AMD Ryzen Threadripper 9970X has 32 cores and 64 threads. The EPYC has exactly four times the core count.

Q: Which CPU has the higher clock speed?

A: The AMD Ryzen Threadripper 9970X has a base clock of 4.00 GHz and a boost clock of 5.40 GHz. The AMD EPYC 9755 has a base clock of 2.70 GHz and a boost clock of 4.10 GHz. The Threadripper is significantly faster in both metrics.

Q: How do they compare in single-thread performance?

A: The Threadripper 9970X wins the single-thread test with a score of 4,530, which is 22.7% higher than the EPYC 9755’s score of 3,503. This is the only benchmark category where the Threadripper beats the EPYC.

Q: What is the memory configuration difference?

A: The EPYC 9755 supports twelve-channel DDR5 memory with a bandwidth of 576.0 GB/s, while the Threadripper 9970X supports quad-channel DDR5 with a bandwidth of 204.8 GB/s. Both support ECC memory.

Q: Are both CPUs based on the same architecture?

A: Yes, both use the Zen 5 architecture on a 4nm TSMC process. The EPYC 9755 has the codename Turin, and the Threadripper 9970X has the codename Shimada Peak. The EPYC is part of the EPYC 9005 series, and the Threadripper is part of the 9000 series.

Q: Which CPU has more PCIe lanes?

A: The EPYC 9755 has Gen 5 with 128 lanes (CPU only), while the Threadripper 9970X has Gen 5 with 80 lanes (CPU only). The EPYC provides 48 more lanes.

Architecture Differences

Both CPUs are built on Zen 5, but they are implemented differently. The EPYC 9755 uses 16 chiplets, each with a die size of 70.6 mm², for a total transistor count of 133,040 million. The Threadripper 9970X uses 4 chiplets, each also 70.6 mm², but with a total transistor count of only 33,260 million. This is a direct result of the core count difference: the EPYC has 128 cores across 16 dies, while the Threadripper has 32 cores across 4 dies. The L1 cache also differs: the EPYC has 80 KB per core, while the Threadripper has 64 KB per core. Both have 1 MB of L2 per core, but the L3 cache is vastly different. The EPYC has 512 MB of shared L3 cache, while the Threadripper has 128 MB. That is a 384 MB difference, and it directly impacts the EPYC’s ability to handle huge working sets without hitting memory.

The memory controllers are also different. The EPYC uses a twelve-channel DDR5 interface, while the Threadripper uses a quad-channel interface. This results in 576.0 GB/s versus 204.8 GB/s of memory bandwidth, a 2.8x difference. For memory-bound workloads, the EPYC’s bandwidth advantage is enormous. The EPYC is also designed for the AMD Socket SP5 platform, while the Threadripper uses the AMD Socket sTR5. Both have no integrated graphics, so a discrete GPU is required. The EPYC is classified as a Server/Workstation part, while the Threadripper is classified as a Desktop part, which explains the difference in platform and memory support.

Specification Differences

The core count is the most obvious difference: 128 cores and 256 threads for the EPYC 9755 versus 32 cores and 64 threads for the Threadripper 9970X. The base clock is 2.70 GHz for the EPYC and 4.00 GHz for the Threadripper, a 1.30 GHz difference. The boost clock is 4.10 GHz for the EPYC and 5.40 GHz for the Threadripper, a 1.30 GHz difference. The TDP is 500W for the EPYC and 350W for the Threadripper, a 150W gap. The socket is SP5 for the EPYC and sTR5 for the Threadripper. The L1 cache is 80 KB per core for the EPYC and 64 KB per core for the Threadripper. The L3 cache is 512 MB for the EPYC and 128 MB for the Threadripper. The memory bus is twelve-channel for the EPYC and quad-channel for the Threadripper, with memory bandwidth of 576.0 GB/s versus 204.8 GB/s. The PCIe lanes are 128 for the EPYC and 80 for the Threadripper, both on Gen 5. The EPYC has a locked multiplier, while the Threadripper has an unlocked multiplier. The market segment is Server/Workstation for the EPYC and Desktop for the Threadripper. The launch MSRP is $12,984 for the EPYC and $2,499 for the Threadripper, though the database notes these are launch prices only.