Xeon 6521P vs 658X
Aggregate performance score
Xeon 658X outperforms Xeon 6521P by a small 5% based on our aggregate benchmark results.
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 99 | 111 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 25.47 | 33.98 |
| Market segment | Server | Server |
| Power efficiency | 6.58 | 6.94 |
| Designer | Intel | Intel |
| Manufacturer | Intel | Intel |
| Architecture codename | Granite Rapids (2024−2026) | Granite Rapids (2024−2026) |
| Release date | 2 February 2026 (recently) | 24 February 2025 (less than a year ago) |
| Launch price (MSRP) | $1,699 | $1,250 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Xeon 6521P has 33% better value for money than Xeon 658X.
Performance to price scatter graph
Detailed specifications
Xeon 658X and Xeon 6521P basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.
| Physical cores | 24 (Tetracosa-Core) | 24 (Tetracosa-Core) |
| Performance-cores | 24 | no data |
| Threads | 48 | 48 |
| Base clock speed | 3 GHz | 2.6 GHz |
| Boost clock speed | 4.9 GHz | 4.1 GHz |
| Bus rate | 0 GT/s | no data |
| L1 cache | 112 KB (per core) | 112 KB (per core) |
| L2 cache | 2 MB (per core) | 2 MB (per core) |
| L3 cache | 144 MB (shared) | 144 MB (shared) |
| Chip lithography | Intel 3 nm | Intel 3 nm |
| Die size | 2x 598 mm2 | 598 mm2 |
| Maximum case temperature (TCase) | 75 °C | 82 °C |
| 64 bit support | + | + |
| Unlocked multiplier | + | - |
Compatibility
Information on Xeon 658X and Xeon 6521P compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.
| Number of CPUs in a configuration | 1 | 1 |
| Socket | FCLGA4710 | FCLGA4710 |
| Power consumption (TDP) | 250 Watt | 225 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon 658X and Xeon 6521P. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.1, Intel® AMX, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512 | Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512, Intel® AMX |
| AES-NI | + | + |
| AVX | + | + |
| vPro | + | no data |
| Enhanced SpeedStep (EIST) | + | + |
| Speed Shift | + | + |
| Turbo Boost Technology | 2.0 | 2.0 |
| Hyper-Threading Technology | + | + |
| TSX | + | + |
| Turbo Boost Max 3.0 | + | no data |
| Deep Learning Boost | + | + |
Security technologies
Xeon 658X and Xeon 6521P technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| EDB | + | + |
| SGX | - | + |
| OS Guard | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon 658X and Xeon 6521P are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon 658X and Xeon 6521P. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR5(6400MT/s) | DDR5(6400MT/s) |
| Maximum memory size | 4 TB | 4 TB |
| Max memory channels | 8 | 8 |
| ECC memory support | + | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | N/A | N/A |
Peripherals
Specifications and connection of peripherals supported by Xeon 658X and Xeon 6521P.
| PCIe version | 5.0 | 5.0 |
| PCI Express lanes | 128 | 136 |
Synthetic benchmarks
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance. Other than that, Passmark measures multi-core performance.
Pros & cons summary
| Performance score | 38.95 | 36.97 |
| Recency | 2 February 2026 | 24 February 2025 |
| Power consumption (TDP) | 250 Watt | 225 Watt |
Xeon 658X has a 5.4% higher aggregate performance score, and an age advantage of 11 months.
Xeon 6521P, on the other hand, has 11.1% lower power consumption.
Given the minimal performance differences, no clear winner can be declared between Intel Xeon 658X and Intel Xeon 6521P.
Other comparisons
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