AMD EPYC 9275F vs AMD Ryzen 9 PRO 9955 Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive split between these two AMD processors, with the EPYC 9275F winning 9 of the 11 head-to-head Passmark comparisons, and the Ryzen 9 PRO 9955 winning the remaining two. The most dramatic gap appears in the physics test, where the EPYC 9275F scores 12,089 against the Ryzen 9 PRO 9955's 3,332, a 262.8% advantage. This is the single largest delta in the entire head-to-head set and reflects the server part's substantially higher thread count and memory bandwidth, which feed heavily into simulation-style workloads.

In the compute-heavy integer and floating-point workloads, the EPYC 9275F maintains a strong but less extreme lead. Integer math shows 317,777 versus 182,312, a 74.3% difference, while floating-point math lands at 201,888 versus 121,509, a 66.2% gap. Data compression follows a similar pattern: 1,212,560 versus 684,470, a 77.2% margin. The EPYC 9275F also leads in data encryption by 85.6%, scoring 62,664 against 33,754, and in extended instructions by 72.8%, scoring 94,889 versus 54,903.

The multithread score, which aggregates overall parallel throughput, favors the EPYC 9275F by 54.2%, with 84,620 against 54,866. Prime number finding shows a 115% advantage for the EPYC 9275F, and random string sorting is 100.3% higher, with 144,037 versus 71,928. These results are consistent with a processor that has twice the core count and access to twelve-channel memory.

The Ryzen 9 PRO 9955's only wins come in the single-thread tests, where it posts 4,597 against the EPYC 9275F's 3,810, a 17.1% reversal. This matters for lightly threaded workloads that rely on maximum boost frequency, but the EPYC 9275F still holds a 97th percentile ranking across all CPUs, identical to the Ryzen 9 PRO 9955's percentile. The average benchmark score for the EPYC 9275F is 133,174, while the Ryzen 9 PRO 9955 averages 110,612, a difference of roughly 20% in overall aggregate performance.

Architecture Differences

Both chips are built on TSMC's 4 nm process node, but they diverge sharply in nearly every other physical characteristic. The EPYC 9275F belongs to the EPYC 9005 series with the Turin codename, using Zen 5 architecture, while the Ryzen 9 PRO 9955 is part of the 9000 series with the Granite Ridge codename, also on Zen 5. The EPYC 9275F packs 24 cores and 48 threads, whereas the Ryzen 9 PRO 9955 has 12 cores and 24 threads, exactly half the parallel resources.

The EPYC 9275F's transistor count is listed at 66,520 million across eight chiplets of 70.6 mm² each, while the Ryzen 9 PRO 9955 uses 16,630 million transistors across two chiplets of the same 70.6 mm² size. This explains the massive difference in L3 cache: the EPYC 9275F has 256 MB shared L3, compared to 64 MB for the Ryzen 9 PRO 9955, a fourfold difference in on-die cache capacity. Both share the same per-core L1 and L2 allocation, 80 KB and 1 MB respectively, so the gap is entirely in the shared last-level cache.

Memory support is another major divergence. The EPYC 9275F runs DDR5 over a twelve-channel memory bus with 576.0 GB/s of bandwidth, while the Ryzen 9 PRO 9955 uses a dual-channel bus with 89.6 GB/s. That is a 6.4x bandwidth advantage for the EPYC part, which directly influences the physics and data compression scores seen earlier. Both support ECC memory, a requirement for server-class reliability.

PCIe connectivity also differs: the EPYC 9275F offers Gen 5 with 128 lanes (CPU only), versus 24 Gen 5 lanes for the Ryzen 9 PRO 9955. The EPYC 9275F has no integrated graphics, whereas the Ryzen 9 PRO 9955 includes Radeon Graphics. The sockets are incompatible: AMD Socket SP5 for the EPYC, AMD Socket AM5 for the Ryzen. TDP figures reflect their intended environments, 320 watts for the EPYC 9275F versus 120 watts for the Ryzen 9 PRO 9955, though the database does not include per-watt efficiency comparisons.

The release dates are far apart. The EPYC 9275F launched on 2024-10-09 with a launch MSRP of $3439, while the Ryzen 9 PRO 9955 has a recorded release date of 2026-06-29 and no launch MSRP listed. The EPYC part number is 100-000001144, the Ryzen part number is 100-000001971. Neither processor has an unlocked multiplier.

Where Each One Wins

The EPYC 9275F is the clear choice for parallel throughput. Every multithreaded benchmark in the head-to-head set lands in its favor, with margins ranging from 54.2% in multithread to 262.8% in physics. Workloads that scale across cores, such as data compression, encryption, integer math, and floating-point math, all show substantial EPYC advantages. The 256 MB L3 cache and twelve-channel memory bandwidth provide additional headroom for data-intensive operations that repeatedly access large working sets.

The Ryzen 9 PRO 9955 wins exclusively in single-threaded performance. Its boost clock of 5.40 GHz, compared to 4.80 GHz for the EPYC 9275F, gives it a 17.1% edge in the single-thread Passmark tests. This matters for applications that cannot utilize more than a few cores, such as certain legacy software, interactive workloads, or latency-sensitive tasks where a single core's speed determines responsiveness. The Ryzen part also draws far less power at 120 watts, which could make it easier to cool in a workstation chassis, though the database does not provide thermal or acoustic measurements.

The wins distribution is lopsided: 9 for the EPYC 9275F, 2 for the Ryzen 9 PRO 9955. The EPYC part's average benchmark score of 133,174 sits 2.5% above the Intel Xeon 6710E's 129,930 and 5% above the AMD EPYC 9354's 126,810, while trailing the Intel Xeon 6737P by 5.3%. The Ryzen 9 PRO 9955's average of 110,612 is 1.8% above the Intel Xeon w7-2595X's 108,663, 3.9% above the AMD Ryzen 9 9850HX's 106,413, and 4.2% above the Intel Xeon w7-3555's 106,192, but it falls 4% behind the Intel Xeon 6527P's 115,190.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 9275F has 24 cores and 48 threads, while the AMD Ryzen 9 PRO 9955 has 12 cores and 24 threads.

Q: What is the single-thread performance difference?

A: The Ryzen 9 PRO 9955 scores 4,597 in the Passmark single-thread test, which is 17.1% higher than the EPYC 9275F's 3,810.

Q: How much faster is the EPYC 9275F in multithreaded workloads?

A: The EPYC 9275F scores 84,620 in Passmark multithread, a 54.2% advantage over the Ryzen 9 PRO 9955's 54,866.

Q: What is the memory bandwidth difference?

A: The EPYC 9275F has a twelve-channel DDR5 bus rated at 576.0 GB/s, compared to the Ryzen 9 PRO 9955's dual-channel bus at 89.6 GB/s.

Q: Do both processors use the same architecture?

A: Both use Zen 5 architecture on a 4 nm TSMC process, but the EPYC 9275F is codenamed Turin and the Ryzen 9 PRO 9955 is codenamed Granite Ridge.

Q: What is the L3 cache capacity on each?

A: The EPYC 9275F has 256 MB of shared L3 cache, while the Ryzen 9 PRO 9955 has 64 MB.

Specification Differences

The two processors differ in core count (24 versus 12), thread count (48 versus 24), base clock (4.10 GHz versus 3.40 GHz), and boost clock (4.80 GHz versus 5.40 GHz). TDP is 320 watts for the EPYC 9275F and 120 watts for the Ryzen 9 PRO 9955. The sockets are AMD Socket SP5 versus AMD Socket AM5, and the codenames are Turin versus Granite Ridge.

Transistor counts are 66,520 million versus 16,630 million, with die sizes of 8x 70.6 mm² versus 2x 70.6 mm². L3 cache is 256 MB versus 64 MB. Memory bus width is twelve-channel versus dual-channel, with bandwidth of 576.0 GB/s versus 89.6 GB/s. PCIe lanes are 128 versus 24, both Gen 5. The EPYC 9275F has no integrated graphics, while the Ryzen 9 PRO 9955 includes Radeon Graphics. Release dates are 2024-10-09 versus 2026-06-29, and part numbers are 100-000001144 versus 100-000001971. The EPYC 9275F has a launch MSRP of $3439, while the Ryzen 9 PRO 9955 has no listed MSRP.

The Verdict

The data points to a straightforward conclusion for buyers choosing between these two. The AMD EPYC 9275F is the superior processor for any workload that can use multiple cores, which includes most server, virtualization, database, and content-creation tasks. Its 54.2% multithread lead, 262.8% physics advantage, and 77.2% data compression margin make it the clear pick for throughput-oriented environments. The 256 MB L3 cache and twelve-channel memory bandwidth support large data sets that would bottleneck the Ryzen part's 64 MB cache and dual-channel bus.

The AMD Ryzen 9 PRO 9955 is only the better option when single-thread performance is the priority and the workload cannot scale beyond a few cores. Its 17.1% single-thread lead and higher 5.40 GHz boost clock give it an edge in such scenarios, and its 120 watt TDP makes it a lower-power alternative. However, the Ryzen part's average benchmark score of 110,612 trails the EPYC 9275F's 133,174 by about 20%, and its nearest rivals include other workstation processors that sit close to its performance level.

For most server or workstation deployments, the EPYC 9275F's wins in 9 of 11 tests, its 97th percentile ranking, and its superior memory subsystem make it the recommended choice. The Ryzen 9 PRO 9955 should be considered only for specialized single-threaded use cases where the EPYC's boost clock cannot compensate for its lower per-core frequency. The benchmark data is unambiguous: the EPYC 9275F dominates in aggregate performance, while the Ryzen 9 PRO 9955 holds a narrow but clear advantage in single-threaded tasks.