Xeon E3-1220 v6 vs 6521P
Aggregate performance score
Xeon 6521P outperforms Xeon E3-1220 v6 by a whopping 1060% 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 | 105 | 1786 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 34.06 | 0.79 |
| Market segment | Server | Server |
| Series | no data | Intel Xeon E3 |
| Power efficiency | 17.49 | 4.71 |
| Designer | Intel | Intel |
| Manufacturer | Intel | no data |
| Architecture codename | Granite Rapids (2024−2025) | Kaby Lake (2016−2019) |
| Release date | 24 February 2025 (less than a year ago) | 28 March 2017 (8 years ago) |
| Launch price (MSRP) | $1,250 | $193 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Xeon 6521P has 4211% better value for money than Xeon E3-1220 v6.
Performance to price scatter graph
Detailed specifications
Xeon 6521P and Xeon E3-1220 v6 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) | 4 (Quad-Core) |
| Threads | 48 | 4 |
| Base clock speed | 2.6 GHz | 3 GHz |
| Boost clock speed | 4.1 GHz | 3.5 GHz |
| Bus type | no data | DMI 3.0 |
| Bus rate | no data | 8 GT/s |
| Multiplier | no data | 30 |
| L1 cache | 112 KB (per core) | 256 KB |
| L2 cache | 2 MB (per core) | 1 MB |
| L3 cache | 144 MB (shared) | 8 MB |
| Chip lithography | Intel 3 nm | 14 nm |
| Die size | 598 mm2 | no data |
| Maximum case temperature (TCase) | 82 °C | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | no data | - |
Compatibility
Information on Xeon 6521P and Xeon E3-1220 v6 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 (Uniprocessor) |
| Socket | FCLGA4710 | FCLGA1151 |
| Power consumption (TDP) | 225 Watt | 72 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon 6521P and Xeon E3-1220 v6. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512, Intel® AMX | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 |
| AES-NI | + | + |
| AVX | + | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| Speed Shift | + | no data |
| Turbo Boost Technology | 2.0 | 2.0 |
| Hyper-Threading Technology | + | - |
| TSX | + | + |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Deep Learning Boost | + | - |
Security technologies
Xeon 6521P and Xeon E3-1220 v6 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| EDB | + | + |
| MPX | - | + |
| SGX | + | Yes with both Intel® SPS and Intel® ME |
| OS Guard | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon 6521P and Xeon E3-1220 v6 are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon 6521P and Xeon E3-1220 v6. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR5(6400MT/s) | DDR4-2400, DDR3L-1866 |
| Maximum memory size | 4 TB | 64 GB |
| Max memory channels | 8 | 2 |
| Maximum memory bandwidth | no data | 38.397 GB/s |
| ECC memory support | + | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | N/A | no data |
Graphics image quality
Maximum display resolutions supported by Xeon 6521P and Xeon E3-1220 v6 integrated GPUs, including resolutions over different interfaces.
| Max resolution over HDMI 1.4 | no data | N/A |
| Max resolution over eDP | no data | N/A |
| Max resolution over DisplayPort | no data | N/A |
| Max resolution over VGA | no data | N/A |
Graphics API support
APIs supported by Xeon 6521P and Xeon E3-1220 v6 integrated GPUs, sometimes API versions are included.
| DirectX | no data | N/A |
| OpenGL | no data | N/A |
Peripherals
Specifications and connection of peripherals supported by Xeon 6521P and Xeon E3-1220 v6.
| PCIe version | 5.0 | 3.0 |
| PCI Express lanes | 136 | 16 |
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 | 36.66 | 3.16 |
| Recency | 24 February 2025 | 28 March 2017 |
| Physical cores | 24 | 4 |
| Threads | 48 | 4 |
| Power consumption (TDP) | 225 Watt | 72 Watt |
Xeon 6521P has a 1060.1% higher aggregate performance score, an age advantage of 7 years, and 500% more physical cores and 1100% more threads.
Xeon E3-1220 v6, on the other hand, has 212.5% lower power consumption.
The Intel Xeon 6521P is our recommended choice as it beats the Intel Xeon E3-1220 v6 in performance tests.
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