AMD EPYC 7663 vs Intel Xeon 676X Comparison

The AMD EPYC 7663 and Intel Xeon 676X target the same server/workstation segment, yet they represent fundamentally different design philosophies. The EPYC 7663 packs 56 Zen 3 cores with a 240 W TDP, while the Xeon 676X counters with 32 Granite Rapids cores, a 4.90 GHz boost, and a 275 W TDP. Benchmark results show a clear split: the Xeon dominates most multi-threaded and single-threaded workloads, but the EPYC wins decisively in encryption, integer math, and data compression. The overall average benchmark score favors the EPYC 7663 at 161973 versus 158540 for the Xeon, a 2.2% margin. Both processors sit at the 98th percentile among all CPUs, placing them at the top of the performance hierarchy, but their strengths diverge sharply across different application types.

Head-to-Head Benchmarks

The Intel Xeon 676X claims victory in 12 of the 16 head-to-head comparisons, and its wins are often substantial. In Cinebench R23 multi-core, the Xeon scores 77447 against the EPYC’s 69773, a 9.9% advantage. The same 9.9% delta appears across Cinebench R15 multi-core (7806 vs 7032), R20 multi-core (32527 vs 29304), and R15 single-core (1101 vs 992). The Xeon’s single-core superiority is most pronounced in PassMark single-thread, where it scores 4015 versus 2606 — a 35.1% lead. That gap reflects the Xeon’s 4.90 GHz boost clock compared to the EPYC’s 3.50 GHz, though the EPYC’s higher core count (56 vs 32) narrows the multi-core gap to a consistent 9.9%.

The AMD EPYC 7663’s four wins are narrower but strategically significant. Its largest victory comes in PassMark data encryption, scoring 111725 against the Xeon’s 67638 — a 65.2% advantage. In integer math, the EPYC scores 468096 versus 354777, a 31.9% lead. Random string sorting shows a 33.6% edge (184367 vs 137976), and data compression favors the EPYC by 6.7% (1447020 vs 1355807). These wins suggest the EPYC’s Zen 3 architecture handles certain integer-heavy and cryptographic workloads far more efficiently, despite the Xeon’s overall multi-core dominance.

Other notable Xeon wins include extended instructions (105231 vs 73719, a 29.9% margin), floating-point math (283570 vs 251535, 11.3% ahead), and PassMark multi-thread (91115 vs 82087, 9.9%). The Xeon also edges out the EPYC in find prime numbers (738 vs 676, 8.4%) and physics (8281 vs 8020, 3.2%). The two single-thread benchmarks (PassMark single_thread and singlethread) both show identical scores of 4015 for the Xeon and 2606 for the EPYC, reinforcing the 35.1% single-core gap.

Where Each One Wins

The Intel Xeon 676X is the clear choice for workloads that scale with clock speed and per-core efficiency. Its 35.1% single-thread lead over the EPYC 7663 makes it better suited for lightly threaded applications, database queries, or any task where latency per core matters more than raw core count. The Xeon’s wins in Cinebench R23 multi-core (77447 vs 69773) and PassMark multi-thread (91115 vs 82087) indicate it also handles heavily parallel workloads effectively, despite having 24 fewer cores. The 29.9% margin in extended instructions points to superior SIMD or specialized instruction execution, which benefits scientific computing or media encoding. Floating-point math (11.3% ahead) and prime number finding (8.4% ahead) further cement the Xeon’s position for numerical and algorithmic tasks.

The AMD EPYC 7663 wins where its 56 cores and 256 MB shared L3 cache can be fully utilized. Data encryption shows a 65.2% advantage, making the EPYC the better fit for VPN gateways, secure communication, or any cryptographic workload. Integer math (31.9% ahead) and random string sorting (33.6% ahead) suggest the EPYC excels in data processing pipelines, log analysis, or key-value stores. Data compression (6.7% ahead) adds another use case in storage or backup systems. The EPYC’s 112 threads versus the Xeon’s 64 provide a natural advantage in high-concurrency environments, even if the Xeon’s higher clock speeds close the gap in other areas.

The average benchmark scores put the EPYC 7663 at 161973, slightly above the Xeon’s 158540, a 2.2% difference. However, this aggregate hides the fact that the Xeon wins 75% of the individual tests. The choice between them depends entirely on whether the workload favors the Xeon’s speed or the EPYC’s scale.

The Verdict

For users prioritizing single-thread performance, the Intel Xeon 676X is the data-backed pick. Its 35.1% lead in PassMark single-thread and consistent 9.9% margins across all Cinebench multi-core tests make it the stronger option for general-purpose compute, engineering simulations, or any environment where per-core throughput is critical. The Xeon’s 4.90 GHz boost clock, 144 MB L3 cache, and DDR5 memory support (409.6 GB/s bandwidth) provide a modern platform advantage. Its launch MSRP is $2499.

The AMD EPYC 7663 is the better choice when encryption, integer math, or data compression dominate the workload. A 65.2% encryption lead and 31.9% integer math margin are not minor differences — they translate to significant throughput gains in security infrastructure, financial modeling, or data analytics. The EPYC’s 56 cores, 112 threads, and 256 MB cache make it ideal for virtualization or containerized workloads where many concurrent processes compete for resources. Its launch MSRP is $6366.

The data does not declare a universal winner. The Xeon 676X outscores the EPYC 7663 in 12 of 16 benchmarks, but the EPYC’s four wins include some of the largest deltas in this comparison. Users running mixed workloads should note that the EPYC’s average score (161973) exceeds the Xeon’s (158540), suggesting a slight overall edge in aggregate performance. However, the Xeon achieves this with 24 fewer cores, indicating superior per-core efficiency. For workloads that can leverage the EPYC’s core count without sacrificing single-thread speed, the EPYC offers a compelling balance; for everything else, the Xeon’s clock speed advantage predominates.

FAQ

Q: Which processor has a higher single-core benchmark score?

A: The Intel Xeon 676X scores 4015 in PassMark single-thread, compared to 2606 for the AMD EPYC 7663, a 35.1% advantage.

Q: How does the EPYC 7663 perform in data encryption relative to the Xeon 676X?

A: The EPYC 7663 scores 111725 in PassMark data encryption, which is 65.2% higher than the Xeon 676X’s 67638.

Q: What are the core and thread counts for each processor?

A: The AMD EPYC 7663 has 56 cores and 112 threads, while the Intel Xeon 676X has 32 cores and 64 threads.

Q: Which CPU wins in Cinebench R23 multi-core rendering?

A: The Intel Xeon 676X scores 77447 in Cinebench R23 multi-core, beating the AMD EPYC 7663’s 69773 by 9.9%.

Q: What is the average benchmark score difference between the two?

A: The AMD EPYC 7663 has an average score of 161973, while the Intel Xeon 676X averages 158540, giving the EPYC a 2.2% lead.

Q: How do the memory bandwidth figures compare?

A: The Intel Xeon 676X supports DDR5 with 409.6 GB/s bandwidth, while the AMD EPYC 7663 uses DDR4 with 204.8 GB/s bandwidth.

Architecture Differences

The AMD EPYC 7663 is built on TSMC’s 7 nm process with a Zen 3 architecture, codenamed Milan. It uses AMD Socket SP3 and contains 33,200 million transistors across 8 dies, each 81 mm² in size. The cache hierarchy includes 64 KB L1 and 512 KB L2 per core, plus a shared 256 MB L3 cache. Memory support is DDR4 over an eight-channel bus, delivering 204.8 GB/s. PCIe connectivity is Gen 4 with 128 lanes from the CPU. The EPYC’s base clock is 2000 MHz with a 3.50 GHz boost, and it has a 240 W TDP. It is not multiplier-unlocked and was released in March 2021.

The Intel Xeon 676X uses Intel’s 5 nm process with a Granite Rapids architecture, part of the Xeon 600 generation. It fits Intel Socket 4710 and has a die size of 2x 598 mm², with no transistor count listed. Cache includes 112 KB L1 and 2 MB L2 per core, plus a shared 144 MB L3. Memory is DDR5 across eight channels, reaching 409.6 GB/s bandwidth — double the EPYC’s throughput. PCIe is Gen 5 with 128 lanes. The Xeon runs at 2.80 GHz base and 4.90 GHz boost, with a 275 W TDP. It is multiplier-unlocked, allowing overclocking, and was released in February 2026.

The most significant architectural differences are core count (56 vs 32), process node (7 nm vs 5 nm), memory generation (DDR4 vs DDR5), and PCIe version (Gen 4 vs Gen 5). The EPYC’s larger L3 cache (256 MB vs 144 MB) likely contributes to its wins in encryption and integer math, where data reuse benefits from more cache. The Xeon’s higher boost clock and newer memory standard explain its single-thread and bandwidth-sensitive advantages. Both support ECC memory, and neither has integrated graphics on the EPYC, while the Xeon lists integrated graphics as N/A. The EPYC’s 56 cores and 112 threads provide a raw parallel advantage, but the Xeon’s per-core performance and memory bandwidth make it a formidable competitor despite fewer cores.