CPU Comparison

The Intel Xeon 678X and AMD EPYC 8534P represent two distinct approaches to high-core-count server processing, and the benchmark data reflects sharply contrasting design philosophies. The Xeon 678X, built on Granite Rapids, dominates the Cinebench suite with a consistent 37.1% lead across every multi-core and single-core iteration, while the EPYC 8534P, a Zen 4c Siena part, counters with decisive victories in data compression, encryption, and integer math. With the Xeon winning 13 of 16 head-to-head tests, the overall average benchmark score lands at 193,477 for Intel versus 185,092 for AMD, a 4.5% gap that positions the Xeon in the 99th percentile of all CPUs compared to AMD's 98th.

Head-to-Head Benchmarks

The most striking pattern emerges in the Cinebench results, where the Intel Xeon 678X posts a near-uniform advantage. In Cinebench R15 multi-core, the Xeon scores 8,444 against AMD's 6,160, a 37.1% delta. That same percentage repeats in R20 multi-core (35,185 vs 25,668), R23 multi-core (83,775 vs 61,115), and even in single-core tests: R15 single-core shows 1,192 vs 869, R20 single-core 4,967 vs 3,623, both also at 37.1%. This consistency suggests a fundamental throughput advantage rather than workload-specific tuning, likely tied to the Xeon's higher boost clock of 4.90 GHz versus the EPYC's 3.10 GHz.

The PassMark suite reveals where AMD fights back. Data compression goes to the EPYC 8534P at 1,791,742 versus 1,690,896, a 5.6% margin. Encryption is a much larger win for AMD: 121,728 vs 83,598, a 31.3% advantage. Integer math also favors AMD at 514,526 vs 405,075, a 21.3% lead. These three wins suggest that the EPYC's 64 cores and 128 threads, compared to the Xeon's 48 cores and 96 threads, pay dividends in parallel integer-heavy workloads that scale with core count rather than clock speed.

Intel's counterpunches in PassMark are equally emphatic. Find prime numbers shows the Xeon at 1,010 versus AMD's 278, an extraordinary 263.3% delta, the largest single gap in the entire comparison. Physics simulation goes to Intel at 7,809 vs 3,667, a 113% advantage. Single-thread performance favors Intel at 3,758 vs 2,441, a 54% lead, and extended instructions show Intel ahead by 25.3% (141,431 vs 112,860). Floating-point math also goes Intel's way at 362,070 vs 289,443 (25.1%), and random string sorting follows with 164,102 vs 129,479 (26.7%). The PassMark multi-thread test mirrors Cinebench with Intel at 98,559 vs 71,900, another 37.1% delta.

FAQ

Q: Why does the Intel Xeon 678X win nearly every Cinebench test by exactly 37.1%?

A: The identical delta across R15, R20, and R23, both single and multi-core, indicates a fixed performance ratio. With the Xeon's 4.90 GHz boost clock versus the EPYC's 3.10 GHz, the per-core clock advantage translates directly into a proportional throughput gain that Cinebench's render workload fully exposes, unaffected by core count differences.

Q: Where does the AMD EPYC 8534P achieve its biggest win over the Intel Xeon 678X?

A: Data encryption shows AMD's largest margin at 31.3% (121,728 vs 83,598). This is followed by integer math at 21.3% (514,526 vs 405,075) and data compression at 5.6% (1,791,742 vs 1,690,896). These workloads benefit from the EPYC's higher core count of 64 versus 48, suggesting better scaling in parallel integer operations.

Q: What is the single largest performance gap between these two processors?

A: The PassMark find prime numbers test shows Intel ahead by 263.3%, scoring 1,010 versus AMD's 278. This is an outlier compared to other deltas, which range from 5.6% to 54%, indicating that the Xeon's architecture handles this specific prime-number algorithm with disproportionate efficiency.

Q: How do the two processors compare in overall average benchmark score?

A: The Intel Xeon 678X averages 193,477 across all benchmarks, while the AMD EPYC 8534P averages 185,092. This puts Intel 4.5% ahead overall, and the nearest rival data confirms the Xeon sits slightly above the EPYC, with the EPYC's own rival list showing a -4.3% delta against the Xeon.

Q: Does the AMD EPYC 8534P have any advantage in multi-threaded workloads?

A: Despite having more cores (64 vs 48) and threads (128 vs 96), the EPYC loses the PassMark multi-thread test by 37.1% (71,900 vs 98,559) and also loses Cinebench multi-core tests by the same margin. The Xeon's higher clock speeds and larger L3 cache (192 MB vs 128 MB) appear to outweigh the core-count deficit.

Q: Which processor ranks higher in percentile versus all CPUs?

A: The Intel Xeon 678X ranks in the 99th percentile, while the AMD EPYC 8534P ranks in the 98th percentile. This one-percentile difference aligns with the 4.5% average score gap and reinforces the Xeon's position as the higher-performing part in aggregate.

Where Each One Wins

The Intel Xeon 678X is the clear choice for rendering, simulations, and physics-based workloads. Its Cinebench dominance at 37.1% across all versions makes it the superior option for 3D rendering pipelines, and the 113% lead in PassMark physics (7,809 vs 3,667) further cements this. Single-thread and lightly-threaded applications also favor Intel heavily, with a 54% lead in single-thread PassMark (3,758 vs 2,441) and matching 37.1% margins in Cinebench single-core tests. Extended instruction workloads (25.3% ahead), floating-point math (25.1%), and random string sorting (26.7%) all point to Intel as the better fit for computational research, financial modeling, and general scientific computing where per-thread performance matters more than raw core count.

The AMD EPYC 8534P wins where core count directly translates to parallel integer throughput. Data compression at 1,791,742 shows a 5.6% edge, encryption at 121,728 delivers a 31.3% advantage, and integer math at 514,526 provides a 21.3% lead. These workloads typically involve hashing, compression algorithms, and database operations that scale almost linearly with cores. For server environments running encryption-heavy services, compression pipelines, or integer-based analytics, the EPYC's 64 cores and 128 threads offer a tangible benefit despite its lower clock speeds. The EPYC also carries a lower TDP of 200 watts versus the Xeon's 300 watts, which may make it attractive for dense multi-socket deployments where power density is a constraint, though that power efficiency comes at the cost of raw performance in most other tests.

Specification Differences

The core and thread counts differ significantly: the Intel Xeon 678X provides 48 cores and 96 threads, while the AMD EPYC 8534P offers 64 cores and 128 threads. Clock speeds also diverge sharply, with the Xeon running at a 2.40 GHz base and 4.90 GHz boost, compared to the EPYC's 2.30 GHz base and 3.10 GHz boost. The TDP rating shows Intel at 300 watts versus AMD at 200 watts. Socket compatibility is entirely separate, with the Xeon using Intel Socket 4710 and the EPYC using AMD Socket SP6. Memory channels differ as well: the Xeon supports eight-channel DDR5 with 409.6 GB/s bandwidth, while the EPYC uses six-channel DDR5 with 230.4 GB/s. PCIe lane counts also favor Intel at 128 Gen 5 lanes (CPU only) versus AMD's 96 Gen 5 lanes (CPU only). The Xeon has an unlocked multiplier, whereas the EPYC is locked. Launch MSRP for the Xeon is $3749, and for the EPYC it is $4950.

Architecture Differences

The Intel Xeon 678X is built on Granite Rapids architecture, part of the Xeon 600 (Granite Rapids-WS) generation, manufactured on Intel's 5 nm process with a die size of 2x 598 mm². The AMD EPYC 8534P uses Zen 4c architecture under the Siena codename, part of the EPYC 8004 series, fabricated by TSMC on a 5 nm node with a die size of 4x 73 mm² and 35,500 million transistors. Cache configurations reveal distinct strategies: the Xeon allocates 112 KB of L1 per core, 2 MB of L2 per core, and 192 MB of shared L3, while the EPYC provides 64 KB L1 per core, 1 MB L2 per core, and 128 MB shared L3. Both support DDR5 memory with ECC, and neither includes integrated graphics. The Xeon's larger L3 cache (192 MB vs 128 MB) and higher per-core cache allocations likely contribute to its single-thread and latency-sensitive advantages, while the EPYC's smaller die size and higher core density reflect a design optimized for throughput-per-watt in scale-out workloads. The Xeon's release date is February 2026, whereas the EPYC launched in September 2023, placing them in different design generations despite both being active production parts.