AMD EPYC 7303 vs AMD Ryzen 9 5900 Comparison

The Verdict

The data presents a clear split personality. The AMD Ryzen 9 5900 is the definitive winner in the vast majority of recorded benchmarks, taking 14 of 17 head-to-head tests. Its advantages are most pronounced in single-threaded and lightly threaded workloads, where its higher boost clock and desktop-oriented design shine. The AMD EPYC 7303, while losing most tests, demonstrates its server pedigree in a few specific areas, particularly extended instruction throughput and data compression. For a desktop user or anyone prioritizing raw per-core performance and responsiveness, the Ryzen 9 5900 is the obvious choice. For a server workload that leverages massive memory bandwidth, many PCIe lanes, and specific instruction sets, the EPYC 7303 has unique, non-negotiable attributes. The verdict is not about which is better overall, but which is better suited to its intended environment.

Architecture Differences

Both processors are built on the same fundamental architecture, Zen 3, and are manufactured on the same 7 nm process at TSMC. Both use a chiplet design with 8,300 million transistors, but the similarities end there. The Ryzen 9 5900, codenamed Vermeer, is a desktop part from the 5000 series, while the EPYC 7303, codenamed Milan, is a server/workstation part from the EPYC 7003 series. The Ryzen 9 uses a dual-chiplet configuration with a die size of 2x 74 mm², while the EPYC uses 2x 81 mm² dies. The core counts differ significantly: the Ryzen 9 has 12 cores and 24 threads, whereas the EPYC has 16 cores and 32 threads. The Ryzen 9 features a much higher boost clock of 4.70 GHz compared to the EPYC's 3.40 GHz, and a higher base clock of 3.00 GHz versus 2.40 GHz. The TDP is dramatically different, with the Ryzen 9 at 65 watts and the EPYC at 130 watts. The EPYC is designed for the AMD Socket SP3 platform and supports eight-channel memory, while the Ryzen 9 uses the AM4 socket with dual-channel memory. Cache configurations are similar in total L3 (64 MB), but the EPYC's is described as shared, while the Ryzen 9's is not. The EPYC also offers significantly more PCIe lanes (128) compared to the Ryzen 9 (20), both Gen 4. The Ryzen 9 has an unlocked multiplier, while the EPYC's is locked. The EPYC has a launch MSRP of $604; the Ryzen 9 has no recorded launch MSRP.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 7303 has more, with 16 cores and 32 threads. The AMD Ryzen 9 5900 has 12 cores and 24 threads.

Q: Which processor has the higher clock speed?

A: The AMD Ryzen 9 5900 has both a higher base clock (3.00 GHz vs 2.40 GHz) and a significantly higher boost clock (4.70 GHz vs 3.40 GHz).

Q: In which benchmark does the AMD Ryzen 9 5900 show its largest advantage?

A: The Ryzen 9 5900 shows its largest advantage in the PassMark single-thread test, where it scored 3439 versus the EPYC 7303's 1460, a delta of 135.5%.

Q: Is there any benchmark where the AMD EPYC 7303 wins?

A: Yes, the EPYC 7303 wins three benchmarks: PassMark data compression, PassMark extended instructions, and PassMark physics.

Q: What is the difference in memory bandwidth between the two?

A: The AMD EPYC 7303 has a much higher memory bandwidth of 204.8 GB/s due to its eight-channel memory bus, compared to the Ryzen 9 5900's 51.2 GB/s from a dual-channel bus.

Q: Do both processors support ECC memory?

A: Yes, both the AMD Ryzen 9 5900 and the AMD EPYC 7303 have ECC memory support listed as true.

Specification Differences

The recorded data shows the following key differences in specifications between the AMD Ryzen 9 5900 and the AMD EPYC 7303:

• Cores: 12 (Ryzen 9) vs 16 (EPYC)
• Threads: 24 (Ryzen 9) vs 32 (EPYC)
• Base Clock: 3.00 GHz (Ryzen 9) vs 2.40 GHz (EPYC)
• Boost Clock: 4.70 GHz (Ryzen 9) vs 3.40 GHz (EPYC)
• TDP: 65 W (Ryzen 9) vs 130 W (EPYC)
• Socket: AMD Socket AM4 (Ryzen 9) vs AMD Socket SP3 (EPYC)
• Codename: Vermeer (Ryzen 9) vs Milan (EPYC)
• Die Size: 2x 74 mm² (Ryzen 9) vs 2x 81 mm² (EPYC)
• Memory Bus: Dual-channel (Ryzen 9) vs Eight-channel (EPYC)
• Memory Bandwidth: 51.2 GB/s (Ryzen 9) vs 204.8 GB/s (EPYC)
• PCIe Lanes: Gen 4, 20 Lanes (Ryzen 9) vs Gen 4, 128 Lanes (EPYC)
• Market Segment: Desktop (Ryzen 9) vs Server/Workstation (EPYC)
• Release Date: 2021-01-11 (Ryzen 9) vs 2023-09-04 (EPYC)
• Multiplier Unlocked: True (Ryzen 9) vs False (EPYC)
• Part Number: 100-000000062 (Ryzen 9) vs 100-000001288100-100001288WOF (EPYC)
• Launch MSRP: None recorded (Ryzen 9) vs $604 (EPYC)

Head-to-Head Benchmarks

The benchmark results overwhelmingly favor the Ryzen 9 5900, but the EPYC 7303 has notable victories. In the Cinebench tests, the Ryzen 9 5900 is consistently ahead. In Cinebench R23 multicore, it scores 28834 versus the EPYC's 24286, an 18.7% advantage. The single-core results are even more telling, with the Ryzen 9 scoring 4070 in Cinebench R23 single-core, an 18.7% lead over the EPYC's 3428. This pattern holds for Cinebench R15 and R20, with the Ryzen 9 leading by 18.7% or 18.8% in all four tests.

The PassMark suite reveals a more complex picture. The Ryzen 9 5900 dominates in PassMark multithread with a score of 33969 versus 28572, an 18.9% lead. Its single-thread performance is extraordinary, with a 135.5% delta over the EPYC in the PassMark single-thread test (3439 vs 1460). The Ryzen 9 also wins in integer math (128641 vs 113422, a 13.4% lead), floating-point math (69124 vs 64940, a 6.4% lead), find prime numbers (213 vs 180, an 18.3% lead), data encryption (26247 vs 25167, a 4.3% lead), and random string sorting (43386 vs 42259, a 2.7% lead).

The EPYC 7303's wins are in three specific areas. It wins PassMark data compression with a score of 428319 versus 411453, a 3.9% margin. Its most significant victory is in PassMark extended instructions, scoring 31603 versus 26859, a 15% delta. It also wins PassMark physics, scoring 1792 versus 1697, a 5.3% margin.

Where Each One Wins

The AMD Ryzen 9 5900 is the clear winner in most general-purpose and compute-heavy tasks. Its 18.7% to 18.9% leads across all Cinebench versions, both multicore and single-core, indicate it is the better choice for rendering, video encoding, and other workloads that depend on raw CPU throughput. The massive 135.5% lead in PassMark single-thread performance makes it the superior option for any application that relies on fast single-core execution, such as gaming, legacy software, or lightly threaded productivity apps. Its wins in integer and floating-point math also point to a general computing advantage.

The AMD EPYC 7303 is the winner in specific server-oriented tasks. Its 15% advantage in PassMark extended instructions suggests it is better optimized for workloads that use advanced or specialized instruction sets, which could include certain scientific, financial, or cryptographic applications. Its 3.9% win in data compression indicates a slight edge in storage or database workloads that process large amounts of compressed data. The 5.3% win in PassMark physics is an outlier but could point to better performance in certain simulation tasks. Most importantly, the EPYC's eight-channel memory bus provides 204.8 GB/s of bandwidth versus the Ryzen 9's 51.2 GB/s, and its 128 PCIe lanes versus 20 make it the only one of the two suitable for large-scale server deployments, even though these platform attributes are not directly reflected in the listed CPU benchmarks.