AMD Ryzen 9 7900 vs AMD Ryzen 9 PRO 5945 Comparison

Head-to-Head Benchmarks

The benchmark data splits these two 12-core, 24-thread processors into a clear pattern: the AMD Ryzen 9 7900 dominates in almost every measured workload, while the AMD Ryzen 9 PRO 5945 takes a narrow set of wins in specific rendering tests. Out of 15 head-to-head comparisons, the Ryzen 9 7900 wins 12, with the PRO 5945 taking only 3.

The largest margin for the Ryzen 9 7900 appears in PassMark physics testing, where it scores 3059 against 1772 for the PRO 5945, a 72.6% advantage. Prime number finding also shows a massive gap: 380 versus 228, a 66.7% lead. Extended instruction workloads favor the 7900 by 56.3% (42253 vs 27031), and random string sorting gives it a 57.6% edge (68474 vs 43447). These results point to a processor that handles compute-heavy, instruction-dense tasks with substantially more headroom.

In multithreaded PassMark testing, the 7900 scores 48347 versus 34549, a 39.9% win. Data compression follows at 38.7% (577847 vs 416599), floating point math at 39.3% (97943 vs 70291), and data encryption at 31.9% (34708 vs 26313). Integer math shows a 26.4% lead (164075 vs 129768). Single-thread PassMark also favors the 7900, with 4130 versus 3499, an 18% advantage.

The PRO 5945 fights back in Cinebench. In Cinebench R23 single-core, it scores 4145 versus 1966 for the 7900, a 52.6% lead. Cinebench R23 multi-core goes to the PRO 5945 as well, 29366 versus 24776, a 15.6% win. Cinebench R15 single-core also favors the PRO 5945, 417 versus 315, a 24.5% margin. The R15 multi-core test is the one exception where the 7900 wins, 4020 versus 2959, a 35.9% advantage.

What this means in practice: the Ryzen 9 7900 is the stronger all-round performer, especially for integer math, encryption, compression, and physics simulation. The PRO 5945 shows unusual strength in Cinebench workloads, which suggests it holds its own in rendering tasks that scale with that particular engine, but the overall benchmark picture strongly favors the 7900.

Average benchmark scores confirm the pattern. The 7900 sits at 49228, while the PRO 5945 sits at 47527. Both processors land in the 90th percentile of all CPUs in the database, so neither is slow, but the 7900 has a clear performance tier above its older counterpart.

FAQ

Q: Which processor is faster in single-threaded PassMark testing?

A: The AMD Ryzen 9 7900 wins PassMark single-thread with 4130 versus 3499 for the AMD Ryzen 9 PRO 5945, an 18% advantage.

Q: How does the Ryzen 9 7900 compare in Cinebench R23 multi-core?

A: The Ryzen 9 PRO 5945 wins Cinebench R23 multi-core with 29366 versus 24776 for the Ryzen 9 7900, a 15.6% lead.

Q: Which CPU has better physics simulation performance?

A: The Ryzen 9 7900 dominates PassMark physics with 3059 versus 1772, a 72.6% advantage.

Q: Are both processors in the same performance percentile?

A: Yes, both the Ryzen 9 7900 and Ryzen 9 PRO 5945 sit in the 90th percentile of all CPUs according to the database.

Q: What is the average benchmark score difference between the two?

A: The Ryzen 9 7900 averages 49228, while the Ryzen 9 PRO 5945 averages 47527, a difference of roughly 1701 points.

Q: Does the Ryzen 9 7900 win in any Cinebench test?

A: Yes, it wins Cinebench R15 multi-core with 4020 versus 2959, a 35.9% margin. The PRO 5945 wins the other three Cinebench comparisons.

Architecture Differences

The two processors come from different generations of AMD design. The Ryzen 9 7900 uses the Zen 4 architecture on the Raphael codename, built on a 5 nm process at TSMC. The Ryzen 9 PRO 5945 uses Zen 3 on the Vermeer codename, built on a 7 nm process, also at TSMC. This process node difference is a major factor in the performance gap, as the newer 5 nm node allows higher clock speeds and better efficiency.

Transistor counts differ substantially. The Ryzen 9 7900 packs 13,140 million transistors across a die size of 2x 71 mm². The PRO 5945 has 8,300 million transistors on a die size of 2x 74 mm². Despite the similar physical die area, the 7900 fits nearly 60% more transistors into a slightly smaller footprint, which reflects the density advantage of the 5 nm process.

Cache layouts differ as well. Both share 64 KB of L1 per core and 64 MB of L3 cache, but the L2 cache differs: the 7900 has 1 MB per core, while the PRO 5945 has 512 KB per core. This doubles the L2 capacity for the 7900, which can improve performance in workloads that repeatedly access working sets that fit in L2.

Memory architecture is another major split. The 7900 supports DDR5 memory with a dual-channel bus and 83.2 GB/s of bandwidth. The PRO 5945 supports DDR4 with a dual-channel bus and 51.2 GB/s of bandwidth. That is a 32 GB/s difference in theoretical memory bandwidth, which contributes to the 7900's lead in bandwidth-sensitive tasks like data compression and encryption.

PCIe support also differs. The 7900 offers PCIe Gen 5 with 24 lanes (CPU only), while the PRO 5945 offers PCIe Gen 4 with 20 lanes (CPU only). This makes the 7900 more future-proof for high-speed storage and graphics cards that can use Gen 5 bandwidth.

The 7900 includes integrated Radeon Graphics, while the PRO 5945 has no integrated graphics at all. The 7900 also has an unlocked multiplier, while the PRO 5945 is locked. The 7900 uses the AMD Socket AM5 platform, while the PRO 5945 uses AMD Socket AM4.

Specification Differences

Clock speeds are a clear differentiator. The Ryzen 9 7900 has a base clock of 3.70 GHz and a boost clock of 5.40 GHz. The Ryzen 9 PRO 5945 has a base clock of 3.00 GHz and a boost clock of 4.70 GHz. The 7900 runs 700 MHz higher at base and 700 MHz higher at boost, which explains much of its single-thread and multithread advantage in PassMark.

Both processors have 12 cores and 24 threads, and both have a 65 W TDP. Both support ECC memory. Both are desktop market segment parts and remain in active production.

The 7900 was released on 2023-01-13, while the PRO 5945 was released on 2022-04-03. The 7900 has a launch MSRP of $429; the PRO 5945 has no recorded launch MSRP in the database.

The 7900 supports DDR5 memory, the PRO 5945 supports DDR4. Memory bandwidth is 83.2 GB/s for the 7900 versus 51.2 GB/s for the PRO 5945. PCIe generation and lane count differ: Gen 5 with 24 lanes versus Gen 4 with 20 lanes. The 7900 has integrated graphics; the PRO 5945 does not. The 7900 has an unlocked multiplier; the PRO 5945 does not. L2 cache is 1 MB per core on the 7900 versus 512 KB per core on the PRO 5945. Process node is 5 nm versus 7 nm, and transistor count is 13,140 million versus 8,300 million.

Where Each One Wins

The Ryzen 9 7900 is the pick for general compute workloads. Its PassMark wins span integer math, floating point math, encryption, compression, extended instructions, prime number finding, physics, random string sorting, and multithreaded performance. The 18% single-thread PassMark win also makes it the better choice for everyday responsiveness and lightly threaded applications. The 7900's DDR5 support and higher memory bandwidth give it a structural advantage in memory-heavy tasks, and its integrated Radeon Graphics means it can run a display without a discrete GPU.

The Ryzen 9 PRO 5945 wins specifically in Cinebench R23 multi-core and both single-core Cinebench tests. That makes it interesting for workloads that use the Cinebench rendering engine or similar Cinema 4D-based pipelines. Its R23 multi-core score of 29366 versus 24776 suggests that certain rendering workloads may actually run faster on the older chip, despite the 7900's wins elsewhere. The PRO 5945 also uses DDR4, which can be an advantage if you are building on an existing AM4 platform and want to reuse memory, though the database does not quantify that cost difference.

For a mixed workload, the 7900 is the safer bet. It wins 12 of 15 head-to-head comparisons, and its wins are often by large margins. The PRO 5945's wins are concentrated in one benchmark family, which makes it a niche choice for users who specifically care about Cinebench-style rendering.

The Verdict

The data points to a straightforward conclusion: the AMD Ryzen 9 7900 is the better processor for almost every use case. It wins the majority of benchmarks, often by 25% to 70%, and it brings modern platform features like DDR5, PCIe Gen 5, and integrated graphics. Its 90th percentile ranking, average score of 49228, and 12 out of 15 head-to-head wins make it the recommended choice for anyone building a new system or upgrading to the AM5 platform.

The AMD Ryzen 9 PRO 5945 has a narrower appeal. Its three wins in Cinebench are real and significant, particularly the 52.6% single-core lead and the 15.6% multi-core lead in R23. If your primary workload is Cinebench-based rendering, the PRO 5945 may deliver better results in that specific engine. Its DDR4 support and AM4 socket also make it a natural drop-in upgrade for existing AM4 builds, though the database does not assign a price to that compatibility.

For everyone else, the choice is clear. The 7900's combination of higher clocks, newer architecture, double the L2 cache, more memory bandwidth, and consistently higher benchmark scores makes it the stronger all-around processor. The PRO 5945 is a capable chip, and its 90th percentile ranking proves it, but the 7900 simply does more things well. Select the 7900 for general productivity, compute-heavy tasks, and future-proofing. Select the PRO 5945 only if Cinebench-family rendering dominates your workflow and you are already invested in the AM4 platform.