AMD EPYC 7763 vs AMD EPYC 9355P Comparison

The AMD EPYC 7763 and AMD EPYC 9355P represent two distinct generations of server silicon, and the benchmark data shows a clear split between raw multithreaded throughput and modern single-thread performance. The 9355P dominates in most tests, but the older 7763 retains significant leads in specific workloads that leverage its massive core count and memory subsystem.

Head-to-Head Benchmarks

The AMD EPYC 9355P wins the majority of the head-to-head comparisons, taking 12 of 17 recorded tests. Its most decisive victory comes in PassMark physics, where it scores 13,515 against the 7763's 7,708, a 43% advantage. This is a massive gap that points to vastly superior per-core floating-point and branch prediction capabilities in the Zen 5 architecture. The single-thread results tell a similar story: the 9355P scores 3,747 in PassMark single-thread versus 2,518 for the 7763, a 32.8% lead. In Cinebench R23 single-core, the 9355P posts 11,670 against 10,150, a 13% margin that carries across every Cinebench iteration. The 9355P also shows a 36% lead in PassMark find prime numbers, scoring 1,044 versus 668.

The multithreaded Cinebench results are particularly telling because the 7763 has twice the cores. The 9355P still wins every Cinebench multicore test by exactly 13%: R15 multicore is 8,332 versus 7,247, R20 multicore is 34,719 versus 30,198, and R23 multicore is 82,666 versus 71,902. PassMark multithread shows a 12.4% lead for the 9355P with 96,603 versus 84,591. The 9355P also wins PassMark extended instructions by 8.7%, scoring 107,622 versus 98,294.

The AMD EPYC 7763 fights back in five tests, and its wins are substantial. The largest is PassMark data encryption: 121,001 versus 80,961, a 49.5% advantage. This is a workload where the 7763's 64 cores and 128 threads can be fully utilized with the AES-NI instruction set. Integer math also favors the older chip by 25.4%, with 516,920 versus 412,067. Floating-point math goes to the 7763 by 12.2% (287,919 versus 256,635), and data compression by 13.9% (1,628,973 versus 1,429,976). Random string sorting is a narrow 3.4% win for the 7763, at 182,676 versus 176,697.

Architecture Differences

The two processors are built on completely different platforms. The EPYC 7763 uses the Zen 3 architecture, codenamed Milan, on a 7 nm process from TSMC. It packs 33,200 million transistors across 8 dies, each measuring 81 mm². The EPYC 9355P uses Zen 5, codenamed Turin, on a 4 nm process. It contains 66,520 million transistors across 8 dies of 70.6 mm² each. The smaller process node and denser transistor count explain how the 9355P achieves higher clock speeds and better efficiency despite having half the cores.

Core and cache configurations differ substantially. The 7763 offers 64 cores and 128 threads, while the 9355P offers 32 cores and 64 threads. The 7763 has 64 KB of L1 cache and 512 KB of L2 cache per core, whereas the 9355P has 80 KB of L1 and 1 MB of L2 per core. Both share 256 MB of L3 cache. The larger per-core L2 cache in the 9355P is a major factor in its single-thread performance advantage.

Memory support is another fundamental divide. The 7763 uses DDR4 with an eight-channel memory bus and 204.8 GB/s of bandwidth. The 9355P uses DDR5 with a twelve-channel bus and 576.0 GB/s of bandwidth. This nearly triples the available memory bandwidth, which helps explain the 9355P's wins in memory-sensitive workloads. Both support ECC memory. PCIe connectivity also advances: the 7763 offers Gen 4 with 128 lanes, while the 9355P offers Gen 5 with 128 lanes.

Clock speeds favor the newer chip. The 7763 has a base clock of 2.45 GHz and a boost clock of 3.50 GHz. The 9355P runs at 3.55 GHz base and 4.40 GHz boost. Both have a 280 W TDP, so the 9355P delivers significantly higher performance within the same power envelope. The 7763 uses AMD Socket SP3, while the 9355P uses AMD Socket SP5, meaning they are not platform-compatible. The 7763 launched in March 2021 with a launch MSRP of $7890. The 9355P launched in October 2024 with a launch MSRP of $2998.

FAQ

Q: Which processor has more cores?

A: The AMD EPYC 7763 has 64 cores and 128 threads, exactly double the 32 cores and 64 threads of the AMD EPYC 9355P.

Q: Why does the 9355P win multicore benchmarks despite having half the cores?

A: The 9355P combines a 3.55 GHz base clock and 4.40 GHz boost clock with a 4 nm process, 1 MB of L2 cache per core, and 576.0 GB/s of DDR5 memory bandwidth. These advantages overcome the core count deficit in the recorded Cinebench and PassMark multithread tests.

Q: Which chip has better single-thread performance?

A: The AMD EPYC 9355P is clearly ahead. It scores 3,747 in PassMark single-thread versus 2,518 for the 7763, a 32.8% lead, and wins every Cinebench single-core test by 13%.

Q: Are these processors compatible with the same motherboard?

A: No. The EPYC 7763 uses AMD Socket SP3, while the EPYC 9355P uses AMD Socket SP5. They are physically incompatible platforms.

Q: Which processor wins in data encryption workloads?

A: The AMD EPYC 7763 wins PassMark data encryption by a wide margin, scoring 121,001 versus 80,961 for the 9355P, a 49.5% advantage.

Q: What memory types do they support?

A: The EPYC 7763 supports DDR4 with an eight-channel bus and 204.8 GB/s bandwidth. The EPYC 9355P supports DDR5 with a twelve-channel bus and 576.0 GB/s bandwidth.

Specification Differences

The two processors differ in nearly every major specification. Core count: 64 versus 32. Thread count: 128 versus 64. Base clock: 2.45 GHz versus 3.55 GHz. Boost clock: 3.50 GHz versus 4.40 GHz. Architecture: Zen 3 versus Zen 5. Codename: Milan versus Turin. Process node: 7 nm versus 4 nm. Transistors: 33,200 million versus 66,520 million. Die size: 8x 81 mm² versus 8x 70.6 mm². L1 cache per core: 64 KB versus 80 KB. L2 cache per core: 512 KB versus 1 MB. L3 cache: 256 MB shared on both. Memory support: DDR4 versus DDR5. Memory bus width: eight-channel versus twelve-channel. Memory bandwidth: 204.8 GB/s versus 576.0 GB/s. PCIe generation: Gen 4 versus Gen 5. Socket: SP3 versus SP3 SP5. Release date: March 2021 versus October 2024. Launch MSRP: $7890 versus $2998. Integrated graphics: none listed for the 7763 versus N/A for the 9355P. TDP is identical at 280 W for both.

The Verdict

The data points to different buyers for each chip. The AMD EPYC 9355P is the right choice for workloads that depend on per-core speed, memory bandwidth, or modern platform features. Its 32.8% single-thread lead, 43% physics win, 36% prime-number win, 576.0 GB/s memory bandwidth, and Gen 5 PCIe make it the superior all-around processor for modern server deployments. The 9355P even wins every Cinebench multicore test by 13%, an achievement that makes the 7763's core count seem almost irrelevant for render workloads. The 9355P also has a lower launch MSRP of $2998, which factors into any comparison.

The AMD EPYC 7763 remains relevant for very specific, heavily threaded workloads. Its 49.5% encryption advantage and 25.4% integer math lead show that 128 threads still matter when the workload can use them. It also wins floating-point math by 12.2% and data compression by 13.9%. The 7763 is the better pick for data encryption pipelines, heavy integer processing, and large-scale compression tasks. Its DDR4 memory support and SP3 socket are older, but the chip remains an active production product.

Where Each One Wins

The AMD EPYC 9355P wins in general compute, rendering, physics simulation, and any workload that benefits from high clock speeds and fast memory. Its Cinebench dominance across R15, R20, and R23, both single-core and multicore, makes it the clear choice for content creation and visualization workloads. The PassMark physics result, a 43% lead, points to simulation and scientific computing advantages. The extended instructions win of 8.7% suggests better SIMD throughput for modern compiled code. Single-thread workloads, legacy applications, and databases that rely on per-core performance will all favor the 9355P.

The AMD EPYC 7763 wins in data encryption, integer math, floating-point math, data compression, and random string sorting. These are workloads that scale with core count or have specific instruction-level patterns that favor the older Zen 3 design. The 49.5% encryption lead is the standout result, making the 7763 a strong option for security appliances, VPN gateways, and encrypted storage systems. The 25.4% integer math win and 12.2% floating-point win indicate that certain numerical workloads still run faster on the 64-core chip. Data compression at 13.9% ahead makes the 7763 useful for backup, archival, and big-data storage systems. The 3.4% random string sorting win is narrow but consistent with the pattern of the 7763 winning tasks that can fully saturate all 128 threads.