EPYC 7251 vs Xeon X5647
Aggregate performance score
EPYC 7251 outperforms Xeon X5647 by a whopping 236% based on our aggregate benchmark results.
Primary details
Comparing Xeon X5647 and EPYC 7251 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1673 | 806 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 1.61 | 2.83 |
| Market segment | Server | Server |
| Series | no data | AMD EPYC |
| Power efficiency | 2.04 | 7.41 |
| Architecture codename | Westmere-EP (2010−2011) | Naples (2017−2018) |
| Release date | 14 February 2011 (13 years ago) | 29 June 2017 (7 years ago) |
| Launch price (MSRP) | $175 | $574 |
Cost-effectiveness evaluation
Performance per price, higher is better.
EPYC 7251 has 76% better value for money than Xeon X5647.
Detailed specifications
Xeon X5647 and EPYC 7251 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 | 4 (Quad-Core) | 8 (Octa-Core) |
| Threads | 8 | 16 |
| Base clock speed | 2.93 GHz | 2.1 GHz |
| Boost clock speed | 3.2 GHz | 2.9 GHz |
| Multiplier | no data | 21 |
| L1 cache | 64 KB (per core) | 96K (per core) |
| L2 cache | 256 KB (per core) | 512K (per core) |
| L3 cache | 12 MB (shared) | 32 MB (shared) |
| Chip lithography | 32 nm | 14 nm |
| Die size | 239 mm2 | 192 mm2 |
| Maximum core temperature | 80 °C | no data |
| Number of transistors | 1,170 million | 4,800 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | - | + |
Compatibility
Information on Xeon X5647 and EPYC 7251 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 | 2 | 2 (Multiprocessor) |
| Socket | FCLGA1366,LGA1366 | TR4 |
| Power consumption (TDP) | 130 Watt | 120 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon X5647 and EPYC 7251. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.2 | no data |
| AES-NI | + | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | + | no data |
| Turbo Boost Technology | 1.0 | no data |
| Hyper-Threading Technology | + | no data |
| Idle States | + | no data |
| Demand Based Switching | + | no data |
| PAE | 40 Bit | no data |
Security technologies
Xeon X5647 and EPYC 7251 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | no data |
| EDB | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon X5647 and EPYC 7251 are enumerated here.
| AMD-V | - | + |
| VT-d | + | no data |
| VT-x | + | no data |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon X5647 and EPYC 7251. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR4 Eight-channel |
| Maximum memory size | 288 GB | 2 TiB |
| Max memory channels | 3 | 8 |
| Maximum memory bandwidth | 25.6 GB/s | 153.652 GB/s |
| ECC memory support | + | + |
Peripherals
Specifications and connection of peripherals supported by Xeon X5647 and EPYC 7251.
| PCIe version | 2.0 | 3.0 |
| PCI Express lanes | no data | 128 |
Synthetic benchmark performance
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. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
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.
Pros & cons summary
| Performance score | 2.85 | 9.58 |
| Recency | 14 February 2011 | 29 June 2017 |
| Physical cores | 4 | 8 |
| Threads | 8 | 16 |
| Chip lithography | 32 nm | 14 nm |
| Power consumption (TDP) | 130 Watt | 120 Watt |
EPYC 7251 has a 236.1% higher aggregate performance score, an age advantage of 6 years, 100% more physical cores and 100% more threads, a 128.6% more advanced lithography process, and 8.3% lower power consumption.
The EPYC 7251 is our recommended choice as it beats the Xeon X5647 in performance tests.
Should you still have questions on choice between Xeon X5647 and EPYC 7251, ask them in Comments section, and we shall answer.
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