AMD EPYC 7643P vs AMD EPYC 9384X Comparison

The AMD EPYC 7643P and the AMD EPYC 9384X represent two different philosophies inside AMD's server lineup: one is a 48-core Zen 3 Milan part with high sustained throughput, the other a 32-core Zen 4 Genoa-X part built around an enormous cache and faster single-thread response. Both sit in the 97th-98th percentile of all CPUs in the database, and both remain active products in the Server/Workstation segment. Yet the recorded data shows a clear and consistent pattern: the 7643P wins 13 of 17 head-to-head benchmarks, while the 9384X takes 4, and the wins split cleanly along architectural lines.

Head-to-Head Benchmarks

Starting with the Cinebench suite, the 7643P sweeps all six tests. In Cinebench R15 multi-core it scores 6623 against 5968, an 11% advantage, and in single-core it scores 934 against 842, a 10.9% lead. The pattern repeats exactly at R20 (27598 versus 24870 multi-core, 11%; 3895 versus 3510 single-core, 11%) and R23 (65710 versus 59215 multi-core, 11%; 9276 versus 8359 single-core, 11%). A consistent 11% margin across three Cinebench generations, in both threaded and lightly threaded modes, is unusual: raw thread count explains the multi-core gap (48 cores versus 32), but the single-core wins confirm the 7643P also holds a per-thread edge in this workload family.

The Passmark suite tells a more varied story. The 7643P dominates the compute-heavy tests: integer math 390775 versus 297833 (31.2% ahead), floating point math 216592 versus 174630 (24% ahead), data encryption 95606 versus 72631 (31.6% ahead), and random string sorting 160274 versus 119440 (34.2% ahead, the largest gap in the entire dataset). Data compression goes the same way at 1326051 versus 1119983, an 18.4% lead. Prime number search favors the 7643P as well, 651 to 596, a 9.2% margin. Overall Passmark multi-thread reads 77307 versus 69665, 11% in favor of the 7643P.

The 9384X fights back in exactly the tests its architecture predicts. Passmark single-thread goes to the 9384X, 3015 to 2655, an 11.9% win. Passmark physics also favors it, 9332 to 8002, a 14.3% gap. Most notably, the extended instructions test, which exercises SIMD throughput, goes to the 9384X at 74363 versus 67398, a 9.4% win: this is the signature of the Zen 4 generation's widened vector capability. So while the 7643P wins 13 of 17 tests overall, the four 9384X wins are not noise; they cluster around single-thread responsiveness, physics simulation, and vectorized instruction paths.

For context, the 7643P's average benchmark score of 144824 places it within a tenth of a percent of the Intel Xeon w9-3575X (delta 0.3%), slightly behind the AMD Ryzen 9 PRO 9965 (delta -0.6%), and ahead of the Ryzen 9 PRO 9965X3D (0.8%) and the Intel Xeon 6732P (1%). The 9384X's average of 120427 sits close to the Xeon w7-3565X (1.8%) and the EPYC 9255 (3.5%), and slightly behind the EPYC 7642 (-2.9%) and the Threadripper PRO 5975WX (-3%). The 7643P occupies the 98th percentile versus the 9384X's 97th.

Architecture Differences

The 7643P is a Zen 3 (Milan) design from the EPYC 7003 series, built on TSMC's 7 nm process with 33,200 million transistors across an 8x 81 mm² die configuration. It runs 48 cores and 96 threads, with a 2.30 GHz base clock and a 3.60 GHz boost, inside a 225 W TDP on Socket SP3. Cache is 64 KB L1 per core, 512 KB L2 per core, and 256 MB of shared L3.

The 9384X is a Zen 4 (Genoa-X) part from the EPYC 9004 series, manufactured on TSMC's 5 nm node with 90,160 million transistors across 8x 72 mm² dies. It carries 32 cores and 64 threads, clocks higher at 3.10 GHz base and 3.90 GHz boost, but does so within a higher 320 W TDP on Socket SP5. Its cache hierarchy is where it diverges most sharply: the same 64 KB L1 per core, but 1 MB of L2 per core (double the 7643P) and a massive 768 MB of shared L3, three times the 7643P's capacity. That L3 figure is the defining feature of the Genoa-X line and explains the 9384X's wins in cache- and instruction-sensitive tests.

Platform I/O differs substantially. The 7643P supports DDR4 on an eight-channel bus with 204.8 GB/s of bandwidth, plus PCIe Gen 4 with 128 CPU lanes. The 9384X supports DDR5 on a twelve-channel bus delivering 460.8 GB/s, more than double the memory bandwidth, plus PCIe Gen 5 with 128 CPU lanes. Both support ECC memory and neither has integrated graphics. Neither has an unlocked multiplier. The 7643P carries a launch MSRP of $2722 and the 9384X a launch MSRP of $5529. Release dates recorded in the database are 2023-09-04 for the 7643P and 2023-06-12 for the 9384X.

The Verdict

The data supports a simple split. Pick the 7643P when threaded throughput is the priority: it is 11% faster in overall multi-threaded rendering and Passmark multi-thread, and 24% to 34% faster in integer math, floating point math, encryption, compression, and string sorting. Its 48 cores deliver results even in single-core Cinebench, where it leads by roughly 11% in every generation of that suite. It also does this at a lower 225 W TDP.

Pick the 9384X when per-thread speed, memory bandwidth, or platform bandwidth dominate the workload. It wins Passmark single-thread by 11.9%, physics by 14.3%, and the extended instructions test by 9.4%, and its twelve-channel DDR5 subsystem provides 460.8 GB/s versus 204.8 GB/s, alongside PCIe Gen 5 instead of Gen 4. Its 768 MB of shared L3 also makes it the natural fit for large working sets. Both are elite parts, ranked 97th-98th percentile against all CPUs in the database.

Specification Differences

• Architecture: Zen 3 (Milan) versus Zen 4 (Genoa-X); EPYC 7003 series versus EPYC 9004 series.
• Process node: 7 nm versus 5 nm, both on TSMC.
• Cores/threads: 48 cores and 96 threads versus 32 cores and 64 threads.
• Clocks: 2.30 GHz base and 3.60 GHz boost versus 3.10 GHz base and 3.90 GHz boost.
• TDP: 225 W versus 320 W.
• Socket: Socket SP3 versus Socket SP5.
• Transistors: 33,200 million versus 90,160 million.
• Die size: 8x 81 mm² versus 8x 72 mm².
• Cache: 512 KB L2 per core and 256 MB shared L3 versus 1 MB L2 per core and 768 MB shared L3. L1 is 64 KB per core on both.
• Memory: DDR4, eight-channel, 204.8 GB/s versus DDR5, twelve-channel, 460.8 GB/s. ECC on both.
• PCIe: Gen 4, 128 CPU lanes versus Gen 5, 128 CPU lanes.
• Launch MSRP: $2722 versus $5529.
• Release date: 2023-09-04 versus 2023-06-12.
• Part number: 100-000001285 for the 7643P; none recorded for the 9384X.

Both share the same market segment, active production status, absence of integrated graphics, and locked multipliers.

FAQ

Q: Which CPU is faster overall in multi-threaded workloads? A: The EPYC 7643P. It wins Cinebench R23 multi-core 65710 to 59215 (11%) and Passmark multi-thread 77307 to 69665 (11%), driven by its 48 cores versus 32.

Q: Which one is faster in single-threaded tasks? A: It depends on the test. The 7643P wins every Cinebench single-core test by about 11% (9276 versus 8359 in R23), but the 9384X wins Passmark single-thread 3015 to 2655, an 11.9% advantage.

Q: Why does the 9384X win the extended instructions test despite fewer cores? A: Its Zen 4 (Genoa-X) architecture is the likely explanation. It scores 74363 versus 67398, a 9.4% lead, and Zen 4 is the newer generation in this pairing, built on 5 nm rather than 7 nm.

Q: How much more memory bandwidth does the 9384X have? A: It offers 460.8 GB/s via twelve-channel DDR5, versus 204.8 GB/s via eight-channel DDR4 on the 7643P.

Q: How do the two compare against rival CPUs in the database? A: The 7643P's average score of 144824 is within 0.3% of the Intel Xeon w9-3575X and -0.6% of the Ryzen 9 PRO 9965. The 9384X's 120427 average is 1.8% from the Xeon w7-3565X and -2.9% from the EPYC 7642.

Q: Which CPU has more cache? A: The 9384X, by a wide margin: 768 MB of shared L3 versus 256 MB, and 1 MB of L2 per core versus 512 KB.

Where Each One Wins

EPYC 7643P territory: rendering and batch compute, integer and floating point math, encryption, compression, and string sorting, where it leads by margins from 9.2% (prime numbers, 651 to 596) up to 34.2% (string sorting). Any workload that scales across 96 threads and rewards sheer core count falls here, and it delivers this at 225 W.

EPYC 9384X territory: simulation physics (9332 versus 8002, a 14.3% win), single-thread-responsive applications (3015 versus 2655 in Passmark single-thread), and vectorized extended instruction paths (74363 versus 67398). It is also the platform play: 460.8 GB/s of DDR5 bandwidth, PCIe Gen 5 connectivity, and 768 MB of L3 make it suited to bandwidth-hungry and cache-hungry workloads that cannot use 96 threads efficiently.

The head-to-head record, 13 wins to 4, belongs to the 7643P, but the 9384X's four wins map precisely onto the workloads its newer platform was designed to serve.