AMD EPYC 8434P vs Intel Xeon w9-3575X Comparison

The AMD EPYC 8434P and Intel Xeon w9-3575X are two very different approaches to high-core-count workstation and server processors, and the benchmark data shows a clear split between raw throughput and specialized workloads. The EPYC 8434P is a 48-core Zen 4c part built for density and efficiency, while the Xeon w9-3575X is a 44-core Sapphire Rapids chip aimed at maximum clock speed and single-thread responsiveness. With 16 head-to-head benchmarks, the Intel part wins 13, but the AMD part takes 3 decisive victories in specific data-handling tasks. The average benchmark scores are remarkably close — 146,881 for AMD versus 144,323 for Intel, a difference of just 1.8% — which means the choice comes down to workload, not overall capability.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 8434P has 48 cores and 96 threads, while the Intel Xeon w9-3575X has 44 cores and 88 threads. The AMD part offers 4 more cores and 8 more threads, which helps in heavily parallel workloads.

Q: How do their average benchmark scores compare?

A: The AMD EPYC 8434P has an average benchmark score of 146,881, placing it 0.1% behind the AMD Ryzen Threadripper PRO 9965WX and 1.8% ahead of the Intel Xeon w9-3575X, which scores 144,323. Both processors sit in the 98th percentile of all CPUs.

Q: Which chip wins in Cinebench multi-core tests?

A: The Intel Xeon w9-3575X wins all Cinebench multi-core tests. In Cinebench R23 multi-core, Intel scores 70,837 versus AMD’s 56,516, a 20.2% advantage. The same 20.2% delta appears in R15 and R20 multi-core tests.

Q: Is there any workload where the AMD EPYC 8434P beats the Intel Xeon?

A: Yes. The AMD EPYC 8434P wins PassMark data compression (1,412,835 vs 1,219,584, +15.8%), data encryption (97,254 vs 62,258, +56.2%), and integer math (385,290 vs 298,224, +29.2%).

Q: What are the memory channel configurations?

A: The AMD EPYC 8434P uses six-channel DDR5 memory with 230.4 GB/s bandwidth, while the Intel Xeon w9-3575X uses eight-channel DDR5 with 307.2 GB/s bandwidth. The Intel part has a wider memory bus and higher theoretical bandwidth.

Q: Which processor has a higher boost clock?

A: The Intel Xeon w9-3575X boosts to 4.80 GHz, compared to the AMD EPYC 8434P’s 3.10 GHz boost clock. The Intel chip also has a higher base clock of 2.20 GHz versus 2.50 GHz for AMD.

Architecture Differences

The AMD EPYC 8434P is built on TSMC’s 5 nm process node with a Zen 4c architecture, codenamed Siena. This is a dense-core design: the chip packs 48 cores into a 4x 73 mm² die configuration, totaling 35,500 million transistors. The Zen 4c cores prioritize power efficiency and core count over raw clock speed, which explains the modest 3.10 GHz boost clock. Each core has 64 KB of L1 cache and 1 MB of L2 cache, with a shared 128 MB L3 cache. The processor uses AMD Socket SP6 and supports DDR5 memory across six channels.

The Intel Xeon w9-3575X is fundamentally different. It uses Intel’s 10 nm process (codenamed Sapphire Rapids) and features larger, higher-clocked cores. The die size is 4x 477 mm², which is significantly larger than AMD’s four-die setup. Each core has 80 KB of L1 cache and 2 MB of L2 cache, with a shared 97.5 MB L3 cache. The Intel chip boosts to 4.80 GHz, a full 1.70 GHz higher than the AMD part, and has a base clock of 2.20 GHz. It uses Intel Socket 4677 and supports eight-channel DDR5 memory.

The architectures reflect different design philosophies. AMD’s Zen 4c is a compact, power-sipping core that allows 48 cores in a 200 W TDP. Intel’s Sapphire Rapids cores are built for frequency and single-thread performance, which is why the Xeon w9-3575X has a 340 W TDP. The AMD part has 48 cores but a lower boost clock, while Intel offers 44 cores with a much higher ceiling. The L3 cache also differs: AMD has 128 MB shared, Intel has 97.5 MB. Both support ECC memory and PCIe Gen 5, but Intel offers 112 lanes versus AMD’s 96 lanes.

Head-to-Head Benchmarks

The Intel Xeon w9-3575X dominates the Cinebench suite, winning every single test by exactly 20.2%. In Cinebench R15 multi-core, Intel scores 7,140 versus AMD’s 5,696. The single-core results are just as lopsided: Intel posts 1,008 in R15 single-core, AMD manages 804. The pattern holds in R20 (29,751 vs 23,736 multi-core; 4,200 vs 3,350 single-core) and R23 (70,837 vs 56,516 multi-core). This consistent 20.2% delta across all Cinebench tests suggests a fundamental per-core performance advantage for Intel, not just a clock speed effect.

The PassMark suite tells a more nuanced story. Intel wins in extended instructions (109,843 vs 86,189, +21.5%), find prime numbers (687 vs 298, +56.6%), floating point math (273,398 vs 215,669, +21.1%), multithread (83,338 vs 66,490, +20.2%), physics (6,836 vs 4,036, +41%), random string sorting (134,723 vs 125,932, +6.5%), and single-thread tests (3,672 vs 2,448, +33.3%). The single-thread gap is particularly striking — Intel is a third faster in that metric.

However, the AMD EPYC 8434P wins three specialized PassMark tests by wide margins. Data encryption shows AMD at 97,254 versus Intel’s 62,258, a massive 56.2% lead. Integer math goes to AMD at 385,290 versus 298,224, a 29.2% advantage. Data compression also favors AMD: 1,412,835 versus 1,219,584, a 15.8% win. These are not marginal victories — the encryption and integer math results are decisive and suggest AMD’s architecture has specific strengths in cryptographic and integer-heavy workloads.

Specification Differences

The two processors differ in nearly every core specification. The AMD EPYC 8434P has 48 cores and 96 threads, while the Intel Xeon w9-3575X has 44 cores and 88 threads. Base clocks are close — 2.50 GHz for AMD versus 2.20 GHz for Intel — but boost clocks diverge sharply: 3.10 GHz for AMD versus 4.80 GHz for Intel. TDP is another major split: 200 W for AMD versus 340 W for Intel.

Cache hierarchies differ as well. AMD uses 64 KB L1 and 1 MB L2 per core, with a 128 MB shared L3. Intel uses 80 KB L1 and 2 MB L2 per core, with a 97.5 MB shared L3. The AMD L3 is larger by 30.5 MB, but Intel’s per-core L2 is double AMD’s. Memory support is DDR5 for both, but AMD runs six channels at 230.4 GB/s, while Intel runs eight channels at 307.2 GB/s. Both support ECC memory.

The sockets are incompatible: AMD Socket SP6 versus Intel Socket 4677. The AMD chip is built on a 5 nm process at TSMC, while Intel uses its own 10 nm process. The AMD die size is 4x 73 mm², Intel’s is 4x 477 mm² — a massive physical difference that explains the TDP gap. Intel offers 112 PCIe Gen 5 lanes, AMD offers 96. The Intel part has an unlocked multiplier, the AMD part does not. The AMD EPYC 8434P has a launch MSRP of $2700, while the Intel Xeon w9-3575X has a launch MSRP of $3789.

Where Each One Wins

The Intel Xeon w9-3575X is the clear winner for general-purpose workstation performance. It wins every Cinebench test, all floating-point math, physics, and single-thread benchmarks. The 33.3% single-thread advantage makes it the better choice for applications that rely on per-core speed, such as CAD, simulation, or any software with poorly parallelized code paths. The 20.2% lead in multi-core Cinebench results also means it handles rendering and video encoding faster, despite having 4 fewer cores. The 56.6% win in find prime numbers highlights its integer-heavy computation strength, and the 41% physics win suggests better performance in simulation workloads.

The AMD EPYC 8434P wins in three specific areas that are critical for certain server and data-center tasks. The 56.2% lead in data encryption makes it the stronger choice for cryptography, secure communications, or any workload that involves heavy AES or similar operations. The 29.2% win in integer math points to strength in database operations, file processing, and other integer-driven tasks. The 15.8% data compression win makes it suitable for backup, archival, or storage-heavy workloads. Its 48 cores and 96 threads, combined with a lower 200 W TDP, also make it more power-efficient for sustained multi-threaded server loads.

The benchmark averages show how close these chips are overall: AMD’s 146,881 versus Intel’s 144,323 is only a 1.8% difference. But the distribution of wins is not balanced — Intel dominates in 13 of 16 tests, while AMD’s 3 wins are in narrow but significant niches. For a user running varied workloads, Intel will feel faster in most scenarios. For a user with a dedicated encryption or compression pipeline, AMD offers a substantial edge in those specific tasks.

The Verdict

The data points to the Intel Xeon w9-3575X as the more versatile processor for most workstation buyers. It wins 13 of 16 head-to-head benchmarks, including every Cinebench test and all single-thread metrics. The 33.3% single-thread advantage and 20.2% multi-core lead across Cinebench make it the stronger choice for rendering, video editing, and general compute. The 340 W TDP and 4.80 GHz boost clock show Intel is trading power for speed, and the benchmark results justify that trade for performance-sensitive workloads.

The AMD EPYC 8434P is the right pick for specialized workloads where its wins matter. The 56.2% encryption lead and 29.2% integer math advantage make it the superior choice for security-focused servers, database engines, or data-processing pipelines. Its 15.8% compression win adds to that profile. With 48 cores and a 200 W TDP, it offers more cores per watt than the Intel part, which is valuable in dense server deployments where power and cooling are constraints.

For a general-purpose workstation, the Intel Xeon w9-3575X is the data-backed recommendation. For an encryption-heavy or integer-bound server workload, the AMD EPYC 8434P is clearly superior. The 1.8% average score difference means neither chip is a bad choice, but the pattern of wins strongly favors Intel for mixed workloads. The AMD part’s wins are concentrated and specific, making it a specialist tool rather than a generalist. Users who prioritize single-thread speed, floating-point math, and physics should choose Intel; those who need top-tier encryption and integer throughput should choose AMD.