Xeon E5-4655 v4 vs Atom x5-E3940
Aggregate performance score
Xeon E5-4655 v4 outperforms Atom x5-E3940 by a whopping 460% based on our aggregate benchmark results.
Primary details
Comparing Atom x5-E3940 and Xeon E5-4655 v4 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2307 | 1013 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 0.42 |
| Market segment | Laptop | Server |
| Series | 5x Intel Atom | Intel Xeon E5 |
| Power efficiency | 11.61 | 4.82 |
| Architecture codename | Apollo Lake (2014−2016) | Broadwell (2015−2019) |
| Release date | 30 August 2014 (10 years ago) | 20 June 2016 (8 years ago) |
| Launch price (MSRP) | no data | $4,616 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Atom x5-E3940 and Xeon E5-4655 v4 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 | 4 | 16 |
| Base clock speed | 1.6 GHz | 2.5 GHz |
| Boost clock speed | 1.8 GHz | 3.2 GHz |
| Bus type | no data | QPI |
| Bus rate | no data | 2 × 9.6 GT/s |
| Multiplier | no data | 25 |
| L1 cache | 56K (per core) | no data |
| L2 cache | 2 MB (shared) | 2 MB |
| L3 cache | 0 KB | 30 MB |
| Chip lithography | 14 nm | 14 nm |
| Die size | no data | 246.24 mm2 |
| Maximum core temperature | no data | 82 °C |
| Maximum case temperature (TCase) | 103 °C | no data |
| Number of transistors | no data | 3200 Million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Atom x5-E3940 and Xeon E5-4655 v4 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 (Uniprocessor) | 4 (Multiprocessor) |
| Socket | Intel BGA 1296 | FCLGA2011 |
| Power consumption (TDP) | 10 Watt | 135 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Atom x5-E3940 and Xeon E5-4655 v4. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® AVX2 |
| AES-NI | + | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | no data | 2.0 |
| Hyper-Threading Technology | no data | + |
| TSX | - | + |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | - |
| PAE | no data | 46 Bit |
Security technologies
Atom x5-E3940 and Xeon E5-4655 v4 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| EDB | no data | + |
| Secure Key | no data | + |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Atom x5-E3940 and Xeon E5-4655 v4 are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Atom x5-E3940 and Xeon E5-4655 v4. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3-1866 | DDR4 |
| Maximum memory size | 8 GB | 1.5 TB |
| Max memory channels | no data | 4 |
| Maximum memory bandwidth | no data | 68 GB/s |
| ECC memory support | - | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Intel HD Graphics 500 | no data |
Peripherals
Specifications and connection of peripherals supported by Atom x5-E3940 and Xeon E5-4655 v4.
| PCIe version | 2.0 | 3.0 |
| PCI Express lanes | 4 | 40 |
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 | 1.25 | 7.00 |
| Recency | 30 August 2014 | 20 June 2016 |
| Physical cores | 4 | 8 |
| Threads | 4 | 16 |
| Power consumption (TDP) | 10 Watt | 135 Watt |
Atom x5-E3940 has 1250% lower power consumption.
Xeon E5-4655 v4, on the other hand, has a 460% higher aggregate performance score, an age advantage of 1 year, and 100% more physical cores and 300% more threads.
The Xeon E5-4655 v4 is our recommended choice as it beats the Atom x5-E3940 in performance tests.
Be aware that Atom x5-E3940 is a notebook processor while Xeon E5-4655 v4 is a server/workstation one.
Should you still have questions on choice between Atom x5-E3940 and Xeon E5-4655 v4, ask them in Comments section, and we shall answer.
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