AMD EPYC 7642 vs AMD EPYC 9384X Comparison

The AMD EPYC 7642 and AMD EPYC 9384X represent two distinct generations of AMD’s server platform, and the benchmark data reveals a clear split between raw throughput and specialized workloads. The EPYC 7642, a 48-core Zen 2 part, leans on core count, while the EPYC 9384X, a 32-core Zen 4 part with massive cache, counters with higher clocks and architectural efficiency. Across 17 head-to-head tests, the EPYC 9384X wins 13, but the EPYC 7642 takes 4, with each victory pattern pointing to different ideal use cases. The average benchmark scores sit close—124,006 for the 7642 versus 120,427 for the 9384X—a 3% gap in favor of the older chip, yet the distribution of wins tells a more nuanced story.

Head-to-Head Benchmarks

The EPYC 9384X dominates every Cinebench test by a consistent margin. In Cinebench R15 multi-core, it scores 5,968 against the 7642’s 5,037, a 15.6% advantage. The same delta appears in single-core, where the 9384X hits 842 versus 711. Cinebench R20 repeats the pattern: 24,870 versus 20,989 multi-core, and 3,510 versus 2,963 single-core. Cinebench R23 shows 59,215 against 49,975 multi-core, with single-core at 8,359 versus 7,055. Every one of these results carries the exact same 15.6% delta, indicating a uniform per-core performance uplift rather than a scaling quirk.

The PassMark suite paints a different picture. The 7642 wins data compression with a score of 1,195,584 against 1,119,983, a 6.8% edge. Data encryption is a larger win: 86,397 versus 72,631, a 19% gap. Floating-point math goes to the 7642 at 181,887 versus 174,630, a 4.2% lead, and integer math follows at 305,303 versus 297,833, a 2.5% margin. These four wins are all in throughput-heavy, parallel workloads where the 7642’s 48 cores outnumber the 9384X’s 32.

The 9384X counters in several specialized PassMark tests. Extended instructions score 74,363 versus 68,841, a 7.4% win. Find prime numbers reaches 596 versus 496, a 16.8% gap. Random string sorting edges ahead at 119,440 versus 114,871, a 3.8% margin. The multithread score is 69,665 versus 58,795, another 15.6% lead. The most dramatic result is physics: 9,332 versus 5,098, a 45.4% blowout. Single-thread performance shows a 31.9% gap, with the 9384X scoring 3,015 versus 2,052.

The average benchmark scores place the 7642 at 124,006, which is 3% above the 9384X’s 120,427. Relative to rivals, the 7642 sits 0.1% behind the AMD Ryzen Threadripper PRO 5975WX (124,171) and 2.2% behind the AMD EPYC 9354 (126,810), while running 6.9% behind the AMD EPYC 9275F (133,174). The 9384X trails the same field: 2.9% behind the 7642, 3% behind the Threadripper PRO 5975WX, 5% behind the EPYC 9354, and 9.6% behind the EPYC 9275F. Both chips hold the 98th percentile among all CPUs, so neither is a slouch in absolute terms.

Where Each One Wins

The EPYC 7642 is the choice for data-heavy, parallel operations. Its wins in data compression (6.8% ahead), data encryption (19% ahead), floating-point math (4.2% ahead), and integer math (2.5% ahead) all benefit from having 48 cores and 96 threads. These workloads scale with core count, and the 7642’s extra 16 cores over the 9384X compensate for its lower per-core clocks. For database compression, bulk encryption, or simulation code that spreads across many threads, the 7642’s benchmark profile is the stronger match.

The EPYC 9384X wins where single-thread speed and cache sensitivity matter. Its 31.9% lead in single-thread PassMark and 15.6% lead in Cinebench single-core tests indicate faster per-core execution, driven by a 3.10 GHz base and 3.90 GHz boost clock versus the 7642’s 2.40 GHz base and 3.40 GHz boost. The physics test, with its 45.4% margin, suggests workloads with irregular memory access patterns benefit from the 9384X’s 768 MB shared L3 cache. Extended instructions (7.4% ahead) and prime-number finding (16.8% ahead) point to compute-bound tasks that favor the newer Zen 4 architecture. The multithread win at 15.6% is notable because the 9384X achieves it with fewer cores, meaning per-core efficiency more than offsets the core-count deficit.

The split is clean: the 7642 for throughput-heavy parallel jobs, the 9384X for latency-sensitive, cache-hungry, or lightly threaded tasks. Both land at the 98th percentile, but the 9384X’s wins are more numerous and often larger in magnitude, while the 7642’s four wins are concentrated in areas where core count is king.

FAQ

Q: Which CPU has a higher average benchmark score?

A: The AMD EPYC 7642 has an average benchmark score of 124,006, which is 3% higher than the AMD EPYC 9384X’s 120,427.

Q: How much faster is the EPYC 9384X in single-thread performance?

A: The EPYC 9384X scores 3,015 in PassMark single-thread, a 31.9% lead over the EPYC 7642’s 2,052. The Cinebench R23 single-core result shows a 15.6% gap, with 8,359 versus 7,055.

Q: Where does the EPYC 7642 beat the EPYC 9384X?

A: The EPYC 7642 wins four tests: data compression (1,195,584 versus 1,119,983, 6.8% ahead), data encryption (86,397 versus 72,631, 19% ahead), floating-point math (181,887 versus 174,630, 4.2% ahead), and integer math (305,303 versus 297,833, 2.5% ahead).

Q: What is the biggest performance gap between the two chips?

A: The largest delta is in PassMark physics, where the EPYC 9384X scores 9,332 against the EPYC 7642’s 5,098, a 45.4% advantage.

Q: How do these chips compare to other CPUs in their class?

A: The EPYC 7642 is 0.1% behind the AMD Ryzen Threadripper PRO 5975WX, 2.2% behind the AMD EPYC 9354, and 6.9% behind the AMD EPYC 9275F. The EPYC 9384X is 2.9% behind the EPYC 7642, 3% behind the Threadripper PRO 5975WX, 5% behind the EPYC 9354, and 9.6% behind the EPYC 9275F.

Q: Do both CPUs have the same market positioning?

A: Both are server/workstation parts with ECC memory support and active production status, but they use different sockets and memory types, which affects platform compatibility.

Specification Differences

The two processors diverge on nearly every core specification. The EPYC 7642 has 48 cores and 96 threads, while the EPYC 9384X has 32 cores and 64 threads. Base clock differs at 2.40 GHz versus 3.10 GHz, and boost clock at 3.40 GHz versus 3.90 GHz. Thermal design power is 225 watts for the 7642 and 320 watts for the 9384X. Sockets are incompatible: the 7642 uses AMD Socket SP3, the 9384X uses AMD Socket SP5.

Memory support changes generationally. The 7642 runs DDR4 with an eight-channel bus and 204.8 GB/s bandwidth. The 9384X runs DDR5 with a twelve-channel bus and 460.8 GB/s bandwidth. PCIe capability also differs: the 7642 lists Gen 4, while the 9384X lists Gen 5 with 128 lanes (CPU only). The 9384X has a launch MSRP of $5529, while the 7642 has no listed launch MSRP.

Cache hierarchies are distinct. The 7642 has 96 KB of L1 per core, 512 KB of L2 per core, and 256 MB of shared L3. The 9384X has 64 KB of L1 per core, 1 MB of L2 per core, and 768 MB of shared L3. Transistor counts and die sizes reflect the process node difference: the 7642 has 3,800 million transistors on a 74 mm² die, while the 9384X has 90,160 million transistors across 8x 72 mm² dies. Both are fabricated by TSMC, but on different nodes.

Architecture Differences

The EPYC 7642 is built on Zen 2 architecture with the codename Rome, part of the EPYC (Zen 2 (Rome)) generation. It uses a 7 nm process node. The EPYC 9384X is Zen 4 architecture with the codename Genoa-X, belonging to the EPYC (Zen 4 (Genoa)) generation, on a 5 nm process node. The process shrink from 7 nm to 5 nm is a key enabler of the 9384X’s higher clocks and efficiency.

The core count difference—48 versus 32—is paired with a cache philosophy change. The 7642’s 256 MB of shared L3 is already large, but the 9384X triples that to 768 MB, a configuration that drives its wins in cache-sensitive tests like physics and random string sorting. L1 shrinks from 96 KB per core to 64 KB per core, while L2 doubles from 512 KB to 1 MB per core, reflecting a rebalanced hierarchy.

Memory architecture shifts from DDR4 eight-channel to DDR5 twelve-channel, doubling bandwidth from 204.8 GB/s to 460.8 GB/s. PCIe generation advances from Gen 4 to Gen 5, with the 9384X explicitly listing 128 lanes. Both support ECC memory and lack integrated graphics, targeting the same server segment. The 9384X’s higher TDP of 320 watts versus 225 watts indicates the cost of its performance, but the data shows that cost buys substantial per-core gains—15.6% across all Cinebench tests and up to 45.4% in physics. The 7642 remains competitive only where its 48 cores can overpower the 9384X’s 32, a dynamic that favors the older chip in encryption and compression but leaves it trailing elsewhere.