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Intel Xeon 6766E vs Intel Xeon 6781P: Comparison
Intel Xeon 6766E and Intel Xeon 6781P separate most on l3 cache: Intel Xeon 6766E at 180, Intel Xeon 6781P at 160, 11% in favour of Intel Xeon 6766E. They match on 19 other specifications, including product line, form factor and release year. In SPECrate® 2017 Integer (base), 1-chip the Intel Xeon 6781P scores 775 against 665 for the Intel Xeon 6766E, a lead of 14%.
Specs
| Specification |  | |
|---|---|---|
| Product Line | Xeon | Xeon |
| Form Factor | Server & Enthusiast | Server & Enthusiast |
| Model Number | 6766E | 6781P |
| Codename | Sierra Rapids | Granite Rapids |
| Release Year | 2024 | 2024 |
| TDP | 400 W | 400 W |
| Market Segment | Server | Server |
| Socket | Other | Other |
| Socket Status | Current | Current |
| Process Node | 3 | 3 |
| Performance Cores | 0 | 80 |
| Efficiency Cores | 144 | 0 |
| SMT Enabled | No | Yes |
| P-Core Base Clock | 1.9 | 2.0 |
| P-Core Boost Clock | 3.1 | 3.4 |
| Unlocked Multiplier | No | No |
| L3 Cache | 180 | 160-11% |
| Base Power | 400 | 400 |
| Memory Type | DDR5 | DDR5 |
| Memory Channels | 8 | 8 |
| Max Memory Capacity | 2048 | 2048 |
| ECC Support | Yes | Yes |
| Integrated Graphics | No | No |
| Copilot Plus Certified | No | No |
| PCIe Generation | PCIe 5.0 | PCIe 5.0 |
| Cores | 144 | 80 |
| Threads | 144 | 160 |
| Socket Support | 1S/2S | 1S/2S |
| Max Memory | 2048 GB (8-channel DDR5-6400) | 2048 GB (8-channel DDR5-6400) |
| Architecture | Sierra Rapids | Granite Rapids |
Benchmarks
Measured results, not specifications. Percentages are the gap to the leading product in each test.
SPECrate® 2017 Integer (base), 1-chip
Best published 1-chip result on spec.org, retrieved 23 Sept 2026.
SPECrate 2017 Integer runs ten integer workloads, including a compiler, file compression, a chess engine and route planning, with one copy per hardware thread. The score is throughput against a fixed reference machine, so it reflects multi-core server and workstation work rather than gaming. Each figure is the best result a hardware vendor published on spec.org for a one-chip system, so the server, memory and compiler behind each chip differ.
SPECrate® 2017 Floating Point (base), 1-chip
Best published 1-chip result on spec.org, retrieved 23 Sept 2026.
SPECrate 2017 Floating Point runs thirteen scientific and engineering workloads, including weather and climate models, fluid dynamics, molecular dynamics and ray tracing, with one copy per hardware thread. It rewards core count, vector units and memory bandwidth, which is why server chips with many memory channels lead it. Each figure is the best result a hardware vendor published on spec.org for a one-chip system, so the server, memory and compiler behind each chip differ.
SPEC®, SPECrate® and SPECspeed® are registered trademarks of the Standard Performance Evaluation Corporation. Copied by permission of the Standard Performance Evaluation Corporation (SPEC). Results retrieved from www.spec.org on 23 Sept 2026.
Verdict
Intel Xeon 6766E
8.6 / 10 Expert Rating
The Intel Xeon 6766E trades per-core performance for AMD-style core density, a strong pick for horizontally-scaled cloud-native fleets.
Intel Xeon 6781P
8.9 / 10 Expert Rating
The Intel Xeon 6781P is the unique 80-core step in Intel's LGA 4710 Xeon 6 stack, bridging the 64-core and 86-core tiers.