AMD EPYC 8434P vs Intel Xeon 676X Comparison

The Intel Xeon 676X and AMD EPYC 8434P are both 5 nm server processors aimed at the same socket-class market, but they deliver their performance in fundamentally different ways. The Xeon 676X is a 32-core Granite Rapids part with a 4.90 GHz boost clock and a 275 W TDP, while the EPYC 8434P is a 48-core Zen 4c Siena part with a 3.10 GHz boost clock and a 200 W TDP. Benchmark data shows the Xeon wins 13 of 16 head-to-head tests, yet the EPYC takes three meaningful workload-specific victories. The choice between them depends entirely on whether the workload favors the Xeon's massive clock speed advantage or the EPYC's higher core count and efficiency.

FAQ

Q: Which processor has more cores?

A: The AMD EPYC 8434P has 48 cores and 96 threads, while the Intel Xeon 676X has 32 cores and 64 threads. This gives the EPYC a 50% core-count advantage.

Q: Why does the Intel Xeon 676X win most benchmarks despite having fewer cores?

A: The Xeon 676X has a boost clock of 4.90 GHz compared to the EPYC's 3.10 GHz, a 58% clock advantage. This allows it to win 13 of 16 head-to-head tests, including all Cinebench multi-core tests by 37%.

Q: Which processor is better for data encryption workloads?

A: The AMD EPYC 8434P wins the PassMark data encryption test with a score of 97,254, which is 30.5% higher than the Intel Xeon 676X's score of 67,638.

Q: How do their average benchmark scores compare?

A: The Intel Xeon 676X has an average benchmark score of 158,540, while the AMD EPYC 8434P has an average score of 146,881. Both sit at the 98th percentile of all CPUs, but the Xeon holds a 7.9% average score lead.

Q: What is the difference in memory bandwidth?

A: The Intel Xeon 676X supports eight-channel DDR5 memory with 409.6 GB/s bandwidth, while the AMD EPYC 8434P supports six-channel DDR5 with 230.4 GB/s. The Xeon offers 77.8% more memory bandwidth.

Q: Which processor has a higher launch MSRP?

A: The AMD EPYC 8434P has a launch MSRP of $2700, while the Intel Xeon 676X has a launch MSRP of $2499.

Architecture Differences

The Intel Xeon 676X is built on Intel's Granite Rapids architecture, specifically the Xeon 600 series (Granite Rapids-WS) generation. It uses a 5 nm process node fabricated by Intel. The chip's die size is listed as 2x 598 mm², indicating a dual-die design. In contrast, the AMD EPYC 8434P is based on Zen 4c architecture under the codename Siena, part of the EPYC 8004 series. It also uses a 5 nm process node, but fabricated by TSMC, and consists of 4x 73 mm² chiplets totaling 35,500 million transistors.

Cache layouts differ substantially between the two. The Xeon 676X has 112 KB of L1 cache per core, 2 MB of L2 cache per core, and a massive 144 MB of shared L3 cache. The EPYC 8434P has smaller per-core caches: 64 KB L1 and 1 MB L2 per core, with 128 MB of shared L3. While the EPYC's total L3 is lower, its higher core count means each core has less dedicated cache, yet the shared pool remains competitive.

Memory architecture is a major differentiator. The Xeon 676X supports eight-channel DDR5 memory, delivering 409.6 GB/s of bandwidth. The EPYC 8434P uses six-channel DDR5 with 230.4 GB/s. Both support ECC memory, which is expected for server parts. PCIe connectivity also favors Intel: the Xeon offers Gen 5 with 128 lanes (CPU only), while the EPYC offers Gen 5 with 96 lanes (CPU only).

The Xeon 676X has an unlocked multiplier, making it overclockable, while the EPYC 8434P is locked. The Xeon's socket is Intel Socket 4710, whereas the EPYC uses AMD Socket SP6. The Xeon was released on 2026-02-01, while the EPYC launched earlier on 2023-09-17. The Xeon lacks integrated graphics, and the EPYC's integrated graphics field is null, meaning neither has a built-in GPU. The Xeon's part number is SA2CY, and the EPYC's is 100-000000877.

Where Each One Wins

The Intel Xeon 676X is the clear winner in single-threaded and lightly threaded workloads. Its 4.90 GHz boost clock drives a 64% lead in PassMark single-thread score (4,015 vs 2,448) and a 36.9-37% lead across all Cinebench single-core tests. This makes it the better choice for software that relies on high clock speeds, such as legacy applications, database queries with low parallelism, or any workload where per-core performance is the bottleneck. The Xeon also dominates floating-point math, scoring 283,570 versus 215,669, a 31.5% advantage, which is critical for scientific computing and simulation tasks.

The AMD EPYC 8434P wins in specific multi-threaded integer and security workloads. Its most significant victory is in data encryption, where it scores 97,254 versus 67,638, a 30.5% margin. This suggests the EPYC's Zen 4c architecture has superior cryptographic instruction throughput. The EPYC also wins in integer math (385,290 vs 354,777, a 7.9% lead) and data compression (1,412,835 vs 1,355,807, a 4% lead). These are workloads that scale well with core count and benefit from the EPYC's 48 cores versus the Xeon's 32.

For raw multi-threaded rendering, the Xeon wins decisively. In Cinebench R23 multi-core, the Xeon scores 77,447 versus 56,516, a 37% lead, despite having 16 fewer cores. This is because the Xeon's higher clock speed and larger 144 MB L3 cache compensate for the core deficit. The Xeon also wins PassMark multithread by 37% (91,115 vs 66,490) and physics by 105.2% (8,281 vs 4,036), indicating superior performance in simulation and physics engines.

Specification Differences

The two processors differ on nearly every core specification. The Intel Xeon 676X has 32 cores and 64 threads, while the AMD EPYC 8434P has 48 cores and 96 threads. Base clocks are 2.80 GHz for the Xeon and 2.50 GHz for the EPYC, but boost clocks diverge sharply: 4.90 GHz versus 3.10 GHz. The Xeon's TDP is 275 W versus the EPYC's 200 W, meaning the EPYC draws 27.3% less power at the rated TDP.

Cache hierarchies differ in both size and organization. The Xeon has 112 KB L1 per core, 2 MB L2 per core, and 144 MB shared L3. The EPYC has 64 KB L1 per core, 1 MB L2 per core, and 128 MB shared L3. Memory channels are eight for the Xeon and six for the EPYC, with bandwidth of 409.6 GB/s versus 230.4 GB/s. PCIe lanes are 128 for the Xeon and 96 for the EPYC, both Gen 5.

Process node is nominally the same (5 nm), but the foundry differs: Intel for the Xeon, TSMC for the EPYC. The Xeon uses a 2x 598 mm² die configuration, while the EPYC uses 4x 73 mm² chiplets. The EPYC has a stated transistor count of 35,500 million; the Xeon does not list a transistor count. The Xeon has an unlocked multiplier, while the EPYC is locked. Release dates are 2026-02-01 for the Xeon and 2023-09-17 for the EPYC. Launch MSRP differs by $201, with the Xeon at $2499 and the EPYC at $2700.

Head-to-Head Benchmarks

The most striking result is the Xeon's uniform 37% lead across all Cinebench tests. In Cinebench R15 multi-core, the Xeon scores 7,806 against the EPYC's 5,696. R15 single-core shows 1,101 versus 804, a 36.9% margin. R20 multi-core is 32,527 versus 23,736, R20 single-core is 4,591 versus 3,350, and R23 multi-core is 77,447 versus 56,516. These consistent deltas indicate the Xeon's clock advantage scales linearly across the Cinebench suite, making it the superior choice for rendering and general CPU compute.

PassMark single-thread tests show an even larger gap. The Xeon scores 4,015 versus 2,448, a 64% lead. This is the largest single-threaded margin in the entire benchmark set, underscoring the Xeon's dominance in legacy and low-parallelism workloads. The Xeon also wins PassMark physics by 105.2% (8,281 vs 4,036) and find prime numbers by 147.7% (738 vs 298), the latter being the biggest victory for either side.

The EPYC's three wins are concentrated in specific areas. Data encryption shows a 30.5% EPYC lead (97,254 vs 67,638), which is a substantial margin for a security-critical workload. Integer math gives the EPYC a 7.9% win (385,290 vs 354,777), and data compression a 4% win (1,412,835 vs 1,355,807). These results suggest that while the Xeon dominates in floating-point and general compute, the EPYC's higher core count and Zen 4c design are better optimized for certain integer and cryptographic operations.

Extended instructions favor the Xeon by 22.1% (105,231 vs 86,189), and floating-point math by 31.5% (283,570 vs 215,669). Random string sorting goes to the Xeon by 9.6% (137,976 vs 125,932). The overall win count is 13 for the Xeon and 3 for the EPYC, but the EPYC's wins are not trivial — they represent real-world workloads where core count matters more than clock speed.

The Verdict

The Intel Xeon 676X is the better all-around processor for most server and workstation tasks. Its 37% lead in every Cinebench multi-core test and 64% lead in PassMark single-thread make it the obvious choice for rendering, simulation, and general compute. The 144 MB L3 cache and 409.6 GB/s memory bandwidth provide a strong foundation for data-intensive workloads. The unlocked multiplier adds flexibility for users who can manage the 275 W TDP.

The AMD EPYC 8434P is the better choice for specific workloads where its 48 cores and lower 200 W TDP provide advantages. It wins in data encryption by 30.5%, integer math by 7.9%, and data compression by 4%. For servers running cryptographic services, compression algorithms, or other integer-heavy multi-threaded tasks, the EPYC's higher core count and efficiency make it a compelling option. Its six-channel memory and 96 PCIe lanes are still generous for most deployments.

The average benchmark scores reflect this split: the Xeon averages 158,540 versus 146,881 for the EPYC, a 7.9% overall lead. Both sit at the 98th percentile of all CPUs, so neither is a weak choice. The decision comes down to workload mix. If the server runs varied tasks with high clock-speed sensitivity, the Xeon 676X wins. If the server is dedicated to encryption, integer math, or compression, the EPYC 8434P's core count and per-core efficiency deliver better results at a lower TDP. The Xeon's higher memory bandwidth and cache make it the safer general-purpose pick.