AMD EPYC 7303 vs AMD Ryzen 9 PRO 5945 Comparison

The AMD EPYC 7303 and the AMD Ryzen 9 PRO 5945 are an unusual pairing: both are Zen 3 chips on the same 7 nm TSMC process, yet they land in completely different markets. One is a server CPU built around memory bandwidth and platform connectivity, the other a desktop processor built around clock speed and efficiency. The recorded data shows the Ryzen 9 PRO 5945 winning 14 of 17 head-to-head benchmarks, including every Cinebench test, while the EPYC 7303 takes wins in extended instructions, data compression, and physics. Despite the score gap, the two sit nearly side by side in the database rankings, at the 89th and 90th percentiles respectively, which makes this a useful case study in what raw scores do and do not tell you.

FAQ

Q: Which CPU is faster in benchmarks?

A: The Ryzen 9 PRO 5945. It wins 14 of the 17 recorded head-to-head tests, including a clean sweep of the Cinebench suite, where it is ahead by 17.3% in every single- and multi-core run. Its average benchmark score of 47527 also edges out the EPYC 7303's 45960.

Q: Is the EPYC 7303 better at anything?

A: Yes, three things. It wins passmark extended instructions by 16.9% (31603 vs 27031), passmark data compression by 2.8% (428319 vs 416599), and passmark physics by 1.1% (1792 vs 1772).

Q: How big is the single-thread gap?

A: Enormous. The Ryzen 9 PRO 5945 scores 3499 in passmark single thread against 1460 for the EPYC 7303, a 58.3% difference. The same pattern holds in Cinebench R23 single core, 4145 vs 3428.

Q: How do they compare against other CPUs in the database?

A: The EPYC 7303 sits in the 89th percentile with an average score essentially identical to the Intel Core i7-14700HX (delta 0%) and AMD EPYC 4364P (delta 0%), and within 0.2% of the AMD Ryzen AI 9 HX 375 and Intel Core Ultra 5 235. The Ryzen 9 PRO 5945 sits in the 90th percentile, comparable to the Intel Core i7-13700KF (0.4% delta), Intel Core i9-12900F (0.7% delta), and Intel Core Ultra 7 265T (-0.4% delta).

Q: Do they support ECC memory?

A: Both do. Each chip also uses DDR4, so memory type is not a differentiator, though memory bandwidth very much is.

Q: Which one has more cores?

A: The EPYC 7303, with 16 cores and 32 threads versus 12 cores and 24 threads for the Ryzen 9 PRO 5945.

The Verdict

For almost any workload measured in the database, the Ryzen 9 PRO 5945 is the stronger performer. It wins the multi-threaded tests despite having fewer cores, because its 4.70 GHz boost clock towers over the EPYC's 3.40 GHz. If the decision is purely about the benchmark scores shown here, rendering, integer math, floating point, encryption, and single-threaded responsiveness all go to the Ryzen.

The EPYC 7303 is not really competing on those terms. Its case rests on platform capabilities the benchmark scores do not capture: eight-channel memory delivering 204.8 GB/s of bandwidth versus 51.2 GB/s on dual-channel AM4, and 128 PCIe 4 lanes versus 20. Workloads that stream large data sets, attach many devices, or lean on extended instruction throughput favor the server chip. The data confirms a narrow slice of that advantage: extended instructions, data compression, and physics all go its way.

Note the efficiency picture too. The EPYC 7303 carries a 130 W TDP; the Ryzen 9 PRO 5945 runs at 65 W. Half the power draw with better scores in 14 tests is a strong argument for the desktop part in any environment where platform limits do not matter.

Head-to-Head Benchmarks

The Ryzen 9 PRO 5945's biggest wins come in single-threaded work. Its passmark single thread score of 3499 against 1460 is a 58.3% rout, the largest gap in the entire data set. Cinebench R23 single core tells the same story at 4145 vs 3428, and R20 single core is 1740 vs 1439. Any workload with a serial bottleneck favors the Ryzen decisively.

Multi-core also goes to the Ryzen, uniformly at 17.3%. Cinebench R23 multi core is 29366 vs 24286, R20 multi core is 12333 vs 10200, and R15 multi core is 2959 vs 2448. The passmark multithread result matches at 34549 vs 28572, again a 17.3% margin. That a 12-core, 65 W desktop chip beats a 16-core, 130 W server chip across every threaded rendering test is the most striking finding in the data, and it comes down to clock speeds: 3.00 GHz base and 4.70 GHz boost versus 2.40 GHz base and 3.40 GHz boost.

The EPYC 7303's wins are narrower but real. Extended instructions is its best result, 31603 vs 27031, a 16.9% advantage that suggests the server platform's memory subsystem is doing meaningful work on vector-heavy code. Data compression goes its way at 428319 vs 416599 (2.8%), and physics at 1792 vs 1772 (1.1%), essentially a tie.

The remaining tests split toward the Ryzen with varying margins: find prime numbers by 21.1% (228 vs 180), integer math by 12.6% (129768 vs 113422), floating point math by 7.6% (70291 vs 64940), encryption by 4.4% (26313 vs 25167), and string sorting by 2.7% (43447 vs 42259).

Specification Differences

The two chips agree on more than they differ on. Both are AMD, both use the Zen 3 architecture, both are fabbed at TSMC on 7 nm, both contain 8300 million transistors, both support DDR4 with ECC, both lack integrated graphics, and both have locked multipliers. Their cache structures are also identical on paper: 64 KB L1 per core, 512 KB L2 per core, and 64 MB of L3.

Where they differ:

• Cores/threads: 16/32 for the EPYC 7303 vs 12/24 for the Ryzen 9 PRO 5945
• Base clock: 2.40 GHz vs 3.00 GHz
• Boost clock: 3.40 GHz vs 4.70 GHz
• TDP: 130 W vs 65 W
• Socket: SP3 vs AM4
• Memory bus: eight-channel vs dual-channel, 204.8 GB/s vs 51.2 GB/s bandwidth
• PCIe: Gen 4 with 128 CPU lanes vs Gen 4 with 20 CPU lanes
• Die size: 2x 81 mm² vs 2x 74 mm²
• Market segment: Server/Workstation vs Desktop
• Launch MSRP: the EPYC 7303 carried a launch MSRP of $604; no launch MSRP is recorded for the Ryzen 9 PRO 5945

Architecture Differences

Both chips are Zen 3, so the microarchitecture itself is the same. The divergence is in how each implementation is tuned. The EPYC 7303 is codenamed Milan, the server variant of Zen 3, built as two 81 mm² dies and designed to feed its cores through an eight-channel DDR4 controller. Its 64 MB of shared L3 and massive memory bandwidth exist to keep many concurrent threads and I/O devices saturated.

The Ryzen 9 PRO 5945 is codenamed Vermeer, the desktop variant, built as two 74 mm² dies on the AM4 platform. It shares the same 64 MB L3 and per-core cache sizes but pairs them with much higher clocks, 4.70 GHz boost versus 3.40 GHz, which is exactly why it converts fewer cores into more performance in the recorded tests.

Platform connectivity is the sharpest architectural divide. Gen 4 PCIe is common to both, but the lane counts are not: 128 CPU-only lanes on the EPYC against 20 on the Ryzen. For storage arrays, GPUs, or network cards, that difference defines what each system can physically host.

Where Each One Wins

Pick the Ryzen 9 PRO 5945 when: single-threaded speed matters at all. Its 58.3% single-thread lead and uniform 17.3% Cinebench sweep make it the clear choice for rendering, general desktop work, and lightly threaded applications. It also wins encryption, integer math, floating point math, prime number workloads, and string sorting, all while drawing 65 W instead of 130 W. Against its nearest database rivals, it trades blows with chips like the Core i7-13700KF and Core i9-12900F.

Pick the EPYC 7303 when: the workload is instruction-throughput heavy or platform-bound. Its 16.9% win in extended instructions and wins in data compression and physics point to strengths in vectorized and bandwidth-sensitive code. More importantly, its eight-channel memory at 204.8 GB/s and 128 PCIe lanes enable configurations the AM4 platform simply cannot match. For a server or workstation where memory capacity, bandwidth, and device attach matter more than per-thread speed, the EPYC's 89th-percentile overall standing next to rivals like the EPYC 4364P and Core i7-14700HX reflects its intended role.

The short version: the database scores favor the Ryzen 9 PRO 5945 for compute, and the EPYC 7303 for platform. Choose based on which of those two constraints actually drives the build.