AMD EPYC 7763 vs AMD EPYC 9455P Comparison

The AMD EPYC 9455P and AMD EPYC 7763 represent two distinct generations of AMD's server lineup, separated by the Zen 5 and Zen 3 architectures respectively. The benchmark data reveals a decisive generational leap, with the 9455P winning 16 of 17 head-to-head comparisons. However, the 7763 retains a single, notable victory in data encryption, suggesting that raw core count alone does not dictate every workload outcome. The average benchmark scores place the 9455P at 217,854 against the 7763’s 179,916, a gap that underscores the architectural advancements rather than just clock speed differences.

The Verdict

The data presents a clear choice for most server workloads: the AMD EPYC 9455P is the superior performer in nearly every measured category. Its 48 cores and 96 threads, despite being fewer than the 7763’s 64 cores and 128 threads, deliver consistently higher scores across Cinebench and PassMark tests. For users prioritizing multi-threaded rendering, scientific computing, or general-purpose database work, the 9455P’s 38% lead in Cinebench R23 multi-core (99,206 vs 71,902) makes it the obvious selection.

The EPYC 7763, however, is not obsolete. Its single win in PassMark data encryption (121,001 vs 115,403, a 4.6% advantage) indicates that specific cryptographic workloads may still favor the older chip. Additionally, the 7763’s 64 cores provide a higher thread count for heavily parallel tasks that scale linearly, though the benchmark results suggest the 9455P’s Zen 5 efficiency overcomes this deficit in most cases. The 7763’s lower TDP of 280W versus the 9455P’s 300W could also appeal to power-conscious deployments, though the performance-per-watt data here favors the newer part.

Ultimately, the 9455P is the pick for new deployments requiring maximum throughput and single-thread responsiveness. The 7763 remains a viable option for existing SP3 platforms or workloads where encryption performance is paramount, but its 98th percentile ranking versus the 9455P’s 99th shows a meaningful overall performance gap.

Where Each One Wins

The EPYC 9455P dominates across the board in compute-heavy benchmarks. In Cinebench R15, R20, and R23, it wins both single-core and multi-core tests by margins of 37.9% to 38%. This consistency suggests a fundamental IPC advantage from the Zen 5 architecture, not just higher boost clocks. The 9455P’s single-core score of 14,005 in R23 versus the 7763’s 10,150 highlights its strength in lightly-threaded tasks like database queries or application servers that rely on per-core performance.

In PassMark sub-tests, the 9455P extends its lead in floating-point math (357,783 vs 287,919, a 24.3% advantage), integer math (606,239 vs 516,920, a 17.3% lead), and extended instructions (137,485 vs 98,294, a 39.9% gap). The physics test shows the largest delta at 124.6% (17,315 vs 7,708), indicating a massive improvement in simulation or gaming-physics workloads. Prime number finding also favors the 9455P by 65.7% (1,107 vs 668), pointing to enhanced integer arithmetic pipelines.

The EPYC 7763’s sole victory in data encryption (121,001 vs 115,403) is a narrow but notable exception. This could stem from the older Zen 3’s dedicated encryption instructions or the higher core count allowing parallel cryptographic operations. In data compression, the 9455P wins with 1,928,897 vs 1,628,973, an 18.4% margin, showing that even with fewer cores, the newer architecture compresses data faster. The 7763’s 64 cores do not translate to wins in multi-threaded PassMark (84,591 vs 116,927), where the 9455P leads by 38.2%.

Architecture Differences

The two processors are built on fundamentally different nodes and designs. The EPYC 9455P uses the Zen 5 architecture, codenamed Turin, on TSMC’s 4 nm process with 66,520 million transistors across 8 dies of 70.6 mm² each. The EPYC 7763 employs Zen 3, codenamed Milan, on a 7 nm process with 33,200 million transistors across 8 dies of 81 mm² each. This node shrink and transistor density increase explain the 9455P’s performance leap without a proportional rise in core count.

Cache hierarchies differ notably. The 9455P features 80 KB of L1 and 1 MB of L2 per core, while the 7763 has 64 KB of L1 and 512 KB of L2 per core. Both share 256 MB of L3, but the newer part’s larger per-core cache likely contributes to its single-thread and latency-sensitive performance gains. The 9455P’s base clock of 3.15 GHz and boost of 4.40 GHz exceed the 7763’s 2.45 GHz and 3.50 GHz, offering a raw speed advantage on top of architectural improvements.

Memory and I/O subsystems diverge sharply. The 9455P supports DDR5 on a twelve-channel bus with 576.0 GB/s bandwidth, while the 7763 uses DDR4 on an eight-channel bus with only 204.8 GB/s. This 2.8x bandwidth difference is critical for memory-bound workloads like large databases or in-memory analytics. PCIe generation also differs: the 9455P provides Gen 5 with 128 lanes, whereas the 7763 offers Gen 4 with 128 lanes, doubling the available I/O bandwidth for accelerators or storage.

FAQ

Q: Which processor has more cores and threads?

A: The EPYC 7763 has 64 cores and 128 threads, while the EPYC 9455P has 48 cores and 96 threads. Despite the 7763’s higher counts, the 9455P wins most multi-threaded benchmarks.

Q: Does the EPYC 9455P support faster memory?

A: Yes. The 9455P supports DDR5 on a twelve-channel bus with 576.0 GB/s bandwidth, while the 7763 supports DDR4 on an eight-channel bus with 204.8 GB/s.

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

A: The largest delta is in PassMark physics, where the 9455P scores 17,315 versus the 7763’s 7,708, a 124.6% advantage.

Q: Are there any workloads where the EPYC 7763 wins?

A: Yes, the 7763 wins in PassMark data encryption with a score of 121,001 compared to the 9455P’s 115,403, a 4.6% margin.

Q: What are the process nodes for each chip?

A: The 9455P is built on TSMC’s 4 nm process, while the 7763 uses TSMC’s 7 nm process.

Q: Which processor has a higher single-thread score?

A: The 9455P leads significantly, with a PassMark single-thread score of 3,745 versus the 7763’s 2,518, a 48.7% difference.

Head-to-Head Benchmarks

The Cinebench results show a uniform 38% advantage for the 9455P across all versions. In R15 multi-core, the 9455P scores 9,999 against 7,247, while single-core yields 1,411 versus 1,023. R20 multi-core sees 41,666 versus 30,198, and R23 multi-core reaches 99,206 versus 71,902. These consistent margins indicate that the 9455P’s Zen 5 cores deliver roughly 38% more performance per clock across both single- and multi-threaded rendering workloads.

PassMark sub-tests reveal varied deltas. The physics test is the standout, with the 9455P at 17,315 and the 7763 at 7,708, a 124.6% gap that suggests a complete redesign in floating-point or simulation units. Prime number finding shows a 65.7% lead (1,107 vs 668), while extended instructions trail at 39.9% (137,485 vs 98,294). Single-thread performance is 48.7% higher (3,745 vs 2,518), and multi-thread performance is 38.2% higher (116,927 vs 84,591).

The 7763’s encryption win at 121,001 versus 115,403 is the only reverse result, with a 4.6% margin. In compression, the 9455P leads by 18.4% (1,928,897 vs 1,628,973), and in integer math by 17.3% (606,239 vs 516,920). Floating-point math shows a 24.3% gap (357,783 vs 287,919), and random string sorting a 32.9% advantage (242,701 vs 182,676). These results collectively show the 9455P winning 16 of 17 tests, with only encryption favoring the older chip.

Specification Differences

The most visible difference is core count: the 9455P has 48 cores and 96 threads, while the 7763 has 64 cores and 128 threads. Base clocks differ at 3.15 GHz for the 9455P versus 2.45 GHz for the 7763, with boost clocks of 4.40 GHz and 3.50 GHz respectively. TDP also varies, with the 9455P rated at 300W and the 7763 at 280W.

Process technology separates them: the 9455P uses a 4 nm node with 66,520 million transistors, while the 7763 uses a 7 nm node with 33,200 million transistors. Die size differs as well, with the 9455P at 8x 70.6 mm² and the 7763 at 8x 81 mm². Cache allocations per core are larger on the 9455P: 80 KB L1 and 1 MB L2 versus 64 KB L1 and 512 KB L2, though both share 256 MB L3.

Memory support is a major divergence: the 9455P uses DDR5 on a twelve-channel bus with 576.0 GB/s bandwidth, while the 7763 uses DDR4 on an eight-channel bus with 204.8 GB/s. PCIe generation differs, with the 9455P offering Gen 5 and the 7763 Gen 4, both with 128 lanes. Sockets are incompatible: the 9455P uses SP5, and the 7763 uses SP3. Release dates show 2024-10-09 for the 9455P versus 2021-03-14 for the 7763. Launch MSRP for the 9455P is $4819, while the 7763 launched at $7890.