AMD EPYC 8434P vs Intel Xeon 674X Comparison

Head-to-Head Benchmarks

The benchmark data presents a stark contrast between the AMD EPYC 8434P and the Intel Xeon 674X, with Intel taking 13 of the 16 head-to-head tests. The most decisive Intel victories come in the Cinebench suite, where a consistent 21% margin appears across every version and workload type. The Xeon 674X scores 7,213 to the EPYC's 5,696 in Cinebench R15 multi-core, and the gap remains identical in R23, with 71,566 versus 56,516. Single-core performance tells the same story: the Xeon leads 1,018 to 804 in R15 and 4,243 to 3,350 in R20.

The PassMark suite reveals a more nuanced picture. The Intel chip dominates in physics calculations, posting 7,586 against the EPYC's 4,036 — a 46.8% advantage. Prime number finding is even more lopsided, with the Xeon scoring 693 versus 298, a 57% lead. The single-thread test shows a 37.8% gap (3,933 vs 2,448), and the multi-thread benchmark favors Intel by 21% (84,196 vs 66,490). Extended instructions and floating-point math also go to Intel, with 11.5% and 11.6% margins respectively, while random string sorting is nearly a tie at 127,529 versus 125,932.

The AMD EPYC 8434P wins three tests, and they are not close. Data encryption shows a massive 58.9% lead (97,254 vs 61,195), suggesting a significant advantage in cryptographic workloads. Integer math goes to AMD by 24.7% (385,290 vs 308,968), and data compression shows a 14.3% edge (1,412,835 vs 1,236,272). These wins indicate that the EPYC's 48 cores and 96 threads provide real throughput advantages in specific throughput-oriented tasks, even as the Xeon's higher clock speeds carry most other workloads.

FAQ

Q: Which processor has the higher average benchmark score?

A: The AMD EPYC 8434P has an average benchmark score of 146,881, compared to 143,103 for the Intel Xeon 674X. Both sit at the 98th percentile of all CPUs. The EPYC's nearest rival is the AMD Ryzen Threadripper PRO 9965WX at 147,009 (0.1% higher), while the Xeon's closest competitor is the Intel Xeon 6732P at 143,444 (0.2% higher).

Q: How do the core counts and threads compare?

A: The AMD EPYC 8434P offers 48 cores and 96 threads, while the Intel Xeon 674X provides 28 cores and 56 threads. Despite having 71% more cores, the EPYC trails in most multi-threaded benchmarks, which indicates the Xeon's per-core efficiency and higher clocks are more impactful in the tested workloads.

Q: What is the difference in memory bandwidth?

A: The Intel Xeon 674X supports eight-channel DDR5 memory with a theoretical bandwidth of 409.6 GB/s, while the AMD EPYC 8434P uses six-channel DDR5 at 230.4 GB/s. This gives Intel a 78% bandwidth advantage, which likely contributes to its strong performance in memory-sensitive tasks like physics calculations and prime number finding.

Q: How significant is the single-thread performance gap?

A: The Xeon 674X leads by 37.8% in PassMark's single-thread test (3,933 vs 2,448) and by 21% in Cinebench R15 single-core (1,018 vs 804). This gap stems from the Xeon's 4.90 GHz boost clock versus the EPYC's 3.10 GHz, making Intel the clear choice for lightly threaded or latency-sensitive workloads.

Q: Which processor has a larger L3 cache?

A: The Intel Xeon 674X has 144 MB of shared L3 cache, compared to 128 MB on the AMD EPYC 8434P. The Xeon also has larger per-core L1 (112 KB vs 64 KB) and L2 (2 MB vs 1 MB) caches, though the EPYC's higher core count means its total per-core cache allocation is proportionally smaller.

Q: Are both processors currently in production?

A: Yes, both the AMD EPYC 8434P and the Intel Xeon 674X have an active production status. The EPYC was released on 2023-09-17, while the Xeon launched on 2026-02-01, making Intel the newer design by roughly two and a half years.

Architecture Differences

The AMD EPYC 8434P is built on the Zen 4c architecture with the codename Siena, fabricated by TSMC on a 5 nm process. It uses 35,500 million transistors spread across four 73 mm² dies. The design philosophy behind Zen 4c prioritizes core density, which explains the 48-core configuration. The Intel Xeon 674X uses the Granite Rapids architecture, also on a 5 nm process but manufactured by Intel's own fabs. Its die size is listed as two 598 mm² dies, which is significantly larger than AMD's four-die setup.

Cache hierarchies differ notably. AMD allocates 64 KB of L1 and 1 MB of L2 per core, with a 128 MB shared L3. Intel allocates 112 KB of L1 and 2 MB of L2 per core, with 144 MB of shared L3. The Intel approach gives each core more private cache, which aligns with its higher clock speeds. The EPYC's smaller per-core cache and larger core count suggest a design optimized for parallel throughput rather than per-thread responsiveness.

The memory subsystem also diverges. AMD uses six-channel DDR5 with 230.4 GB/s of bandwidth, while Intel uses eight-channel DDR5 at 409.6 GB/s. Both support ECC memory, which is expected for server platforms. PCIe connectivity favors Intel with 128 Gen 5 lanes versus 96 on the AMD side. The EPYC uses AMD Socket SP6, while the Xeon uses Intel Socket 4710. Notably, the Xeon 674X has an unlocked multiplier, while the EPYC 8434P does not, giving overclocking flexibility to the Intel part.

Specification Differences

The core and thread counts differ substantially: 48 cores and 96 threads on the AMD side versus 28 cores and 56 threads on Intel. Base clocks favor Intel at 3.00 GHz versus 2.50 GHz, and the boost clock gap is even larger at 4.90 GHz versus 3.10 GHz. The Xeon's 270 W TDP exceeds the EPYC's 200 W, which is consistent with its higher clock speeds and larger dies.

Memory bandwidth is another clear differentiator, with Intel's 409.6 GB/s nearly doubling AMD's 230.4 GB/s. PCIe lane counts also differ, with Intel offering 128 Gen 5 lanes to AMD's 96. The Xeon has an integrated graphics designation of "N/A," while the EPYC lists none at all; both rely on discrete graphics. The launch MSRP for the Intel Xeon 674X is $2199, while the AMD EPYC 8434P carries a launch MSRP of $2700. The Xeon also has an unlocked multiplier, which the EPYC lacks.

Socket compatibility is entirely separate: AMD Socket SP6 versus Intel Socket 4710. Process node is technically the same at 5 nm, but manufacturing differs — TSMC for AMD and Intel for the Xeon. The EPYC's transistor count is listed at 35,500 million, while the Xeon's is not provided. Die sizes are listed as 4x 73 mm² for AMD and 2x 598 mm² for Intel.

The Verdict

The data points to different buyers for each processor. The Intel Xeon 674X wins the majority of benchmarks, particularly in Cinebench and physics-heavy workloads, and its 37.8% single-thread lead makes it the better choice for applications that rely on per-core performance. The 21% margin across all Cinebench tests, regardless of core count, suggests that the Xeon's architecture extracts more work per thread. The 270 W TDP and 409.6 GB/s of memory bandwidth support this — Intel is clearly spending more power and bandwidth to achieve higher sustained performance.

The AMD EPYC 8434P is not without merit. Its 58.9% lead in data encryption and 24.7% advantage in integer math indicate strong suitability for cryptographic and integer-heavy server workloads. The 14.3% edge in data compression also points to versatility in storage and database scenarios. With 48 cores and 96 threads, the EPYC offers more parallelism on paper, but the benchmark results show that the Xeon's 28 cores outperform it in multi-threaded tests by 21%. This is a case where core count alone does not determine performance.

The average benchmark scores are extremely close (146,881 for AMD versus 143,103 for Intel), and both rank at the 98th percentile of all CPUs. The EPYC's nearest rivals include the Ryzen Threadripper PRO 9965WX (0.1% higher) and the EPYC 7643P (1.4% higher), while the Xeon sits just below the Xeon 6732P (0.2% lower) and the Ryzen 9 PRO 9965X3D (0.4% lower). These margins are within noise levels, meaning the two chips are competitive overall despite their very different strengths.

For users prioritizing encryption, integer math, and compression, the AMD EPYC 8434P delivers measurable advantages. For those needing the best single-thread performance, physics simulation, or prime number processing, the Intel Xeon 674X is clearly superior. The Xeon's higher TDP and newer release date suggest it is designed for maximum performance, while the EPYC's lower power draw and higher core count target efficiency and parallel throughput. Choose based on the specific workload mix, not on aggregate scores alone.