AMD EPYC 9384X vs AMD Ryzen Threadripper PRO 9955WX Comparison

The Verdict

The benchmark data presents a fascinating split decision. The AMD EPYC 9384X and AMD Ryzen Threadripper PRO 9955WX occupy the same performance percentile (97th), yet they achieve this status through entirely different means. The EPYC 9384X wins 8 of 17 head-to-head benchmarks, while the Threadripper PRO 9955WX wins 9, making this a near-total statistical tie in overall win count. However, the nature of those wins tells the real story.

For server workloads dominated by encryption, prime number finding, integer math, and physics calculations, the EPYC 9384X is the clear choice. Its 63.6% advantage in data encryption and 124.5% lead in physics processing are massive margins that reflect its 32-core, 64-thread configuration and 768 MB of shared L3 cache. The Threadripper PRO 9955WX counters with a 33.4% victory in single-thread performance, making it the better option for lightly threaded applications, desktop responsiveness, and workloads that cannot scale beyond a few cores. Its higher boost clock of 5.40 GHz versus 3.90 GHz, combined with the newer Zen 5 architecture, delivers the kind of raw per-core speed that the EPYC cannot match.

The Cinebench results are nearly identical, with the Threadripper winning every single test by just 0.5%. This means the EPYC's 32 cores and 768 MB of cache essentially neutralize the Threadripper's clock speed advantage in fully threaded rendering workloads. The Threadripper PRO 9955WX is the pick for workstation users who need strong multi-threaded rendering but also demand excellent single-thread responsiveness. The EPYC 9384X is the pick for server deployments where cache-sensitive workloads, encryption throughput, and massive parallel processing take priority.

FAQ

Q: Which CPU has more cores and threads?

A: The AMD EPYC 9384X has 32 cores and 64 threads, while the AMD Ryzen Threadripper PRO 9955WX has 16 cores and 32 threads. The EPYC offers double the core and thread count.

Q: Which processor has the larger L3 cache?

A: The AMD EPYC 9384X has a massive 768 MB of shared L3 cache, while the AMD Ryzen Threadripper PRO 9955WX has 64 MB of L3 cache. The EPYC's cache is 12 times larger.

Q: How do the Cinebench R23 scores compare?

A: The Threadripper PRO 9955WX wins by a razor-thin margin. It scores 59,494 in multi-core and 8,399 in single-core, while the EPYC 9384X scores 59,215 and 8,359 respectively. The Threadripper leads by 0.5% in both tests.

Q: Which CPU has better single-thread performance?

A: The AMD Ryzen Threadripper PRO 9955WX dominates with a PassMark single-thread score of 4,530, compared to the EPYC 9384X's 3,015. That is a 33.4% advantage for the Threadripper.

Q: What memory configurations do these processors support?

A: Both support DDR5 memory with ECC. The EPYC 9384X uses a twelve-channel memory bus with 460.8 GB/s bandwidth, while the Threadripper PRO 9955WX uses an eight-channel bus with 409.6 GB/s bandwidth.

Q: Are both CPUs on the same manufacturing process?

A: No. The EPYC 9384X uses a 5 nm process with 90,160 million transistors across 8x 72 mm² dies. The Threadripper PRO 9955WX uses a newer 4 nm process with 16,630 million transistors across 2x 70.6 mm² dies.

Architecture Differences

The architectural gap between these two processors is substantial. The EPYC 9384X is built on Zen 4 architecture with the Genoa-X codename, part of the EPYC 9004 series. It uses a 5 nm process from TSMC with 90,160 million transistors spread across 8x 72 mm² dies. The Threadripper PRO 9955WX uses the newer Zen 5 architecture with the Shimada Peak codename, part of the 9000 series. It is manufactured on a 4 nm process with 16,630 million transistors across 2x 70.6 mm² dies.

The cache hierarchy differs dramatically. Both have 64 KB of L1 cache per core and 1 MB of L2 cache per core, but the L3 cache tells a different story. The EPYC 9384X packs 768 MB of shared L3 cache, an enormous amount designed for server workloads that repeatedly access large datasets. The Threadripper PRO 9955WX has 64 MB of L3 cache, which is still generous for a desktop-class processor but pales in comparison. This cache disparity explains the EPYC's massive wins in data compression (21.6%), encryption (63.6%), and physics (124.5%).

Both processors support PCIe Gen 5 with 128 lanes (CPU only) and DDR5 memory with ECC, but the memory channels differ. The EPYC 9384X uses a twelve-channel memory bus delivering 460.8 GB/s, while the Threadripper PRO 9955WX uses an eight-channel bus with 409.6 GB/s. The EPYC also has a lower TDP of 320 watts versus 350 watts for the Threadripper, despite having twice the cores.

The sockets are incompatible: the EPYC uses AMD Socket SP5, while the Threadripper uses AMD Socket sTR5. The Threadripper has an unlocked multiplier and includes integrated graphics (listed as N/A), while the EPYC has a locked multiplier and no integrated graphics. The release dates are also far apart, with the EPYC launching on 2023-06-12 and the Threadripper arriving on 2025-07-22.

Specification Differences

The core count difference is the most obvious: 32 cores and 64 threads for the EPYC 9384X versus 16 cores and 32 threads for the Threadripper PRO 9955WX. Clock speeds favor the Threadripper, which has a base clock of 4.50 GHz and a boost clock of 5.40 GHz, compared to the EPYC's 3.10 GHz base and 3.90 GHz boost.

The process node also differs, with the EPYC on 5 nm and the Threadripper on 4 nm. Transistor counts diverge sharply: 90,160 million for the EPYC versus 16,630 million for the Threadripper. Die sizes are 8x 72 mm² for the EPYC and 2x 70.6 mm² for the Threadripper.

L3 cache is where the EPYC runs away: 768 MB shared versus 64 MB for the Threadripper. Memory bandwidth favors the EPYC at 460.8 GB/s over 409.6 GB/s, with twelve channels versus eight. The TDP is 320 watts for the EPYC and 350 watts for the Threadripper.

The Threadripper PRO 9955WX has an unlocked multiplier, making it overclockable, while the EPYC 9384X is locked. The Threadripper has a part number (100-000000725) and lists integrated graphics as N/A, while the EPYC has no part number and no integrated graphics. Both are marked as Active in production status.

Head-to-Head Benchmarks

The Cinebench suite shows remarkable parity. Across all six Cinebench tests (R15, R20, and R23, each in single and multi-core), the Threadripper PRO 9955WX wins every time with a 0.5% margin. The scores are close enough to be considered identical in real-world terms: 5,968 versus 5,996 in R15 multi-core, 842 versus 846 in R15 single-core, 24,870 versus 24,987 in R20 multi-core, 3,510 versus 3,527 in R20 single-core, 59,215 versus 59,494 in R23 multi-core, and 8,359 versus 8,399 in R23 single-core. The Threadripper's higher clocks and Zen 5 architecture just barely overcome the EPYC's core and cache advantages in these rendering workloads.

The PassMark suite reveals the EPYC's dominance in server-oriented tasks. The biggest win for the EPYC comes in physics processing, where it scores 9,332 against the Threadripper's 4,156, a 124.5% advantage. Data encryption shows a 63.6% lead (72,631 versus 44,389), while integer math is 26.1% ahead (297,833 versus 236,120). Data compression favors the EPYC by 21.6% (1,119,983 versus 920,954), and random string sorting goes to the EPYC by 19.7% (119,440 versus 99,813). Floating point math also favors the EPYC, with 174,630 versus 156,215, an 11.8% margin. Multi-thread performance goes to the EPYC by 3.9% (69,665 versus 67,035), and find prime numbers shows a 76.9% advantage for the EPYC (596 versus 337).

The Threadripper's wins outside Cinebench are focused on single-thread performance. PassMark single-thread shows the Threadripper at 4,530 versus the EPYC's 3,015, a 33.4% lead. Extended instructions favor the Threadripper by 2.6% (76,363 versus 74,363). These wins, combined with the Cinebench sweep, give the Threadripper 9 total wins against the EPYC's 8.

The average benchmark scores tell a different story. The EPYC 9384X has an average benchmark score of 120,427, while the Threadripper PRO 9955WX averages 101,041. The EPYC's nearest rival, the Intel Xeon w7-3565X, scores 118,307 with a 1.8% delta, and the AMD EPYC 7642 scores 124,006 with a -2.9% delta. The Threadripper's nearest rival, the AMD EPYC 7513, scores 102,244 with a -1.2% delta. Despite the Threadripper winning more head-to-head tests, the EPYC's larger leads in its winning categories give it a higher overall average score. The data indicates the EPYC excels in workloads that benefit from massive parallelism and cache capacity, while the Threadripper is the superior choice for mixed workloads that include significant single-threaded components.