Celeron 3865U vs Xeon E5-2666 V3
Aggregate performance score
Xeon E5-2666 V3 outperforms Celeron 3865U by a whopping 976% based on our aggregate benchmark results.
Primary details
Comparing Xeon E5-2666 V3 and Celeron 3865U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 857 | 2581 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Server | Laptop |
| Series | no data | Intel Celeron |
| Power efficiency | 6.26 | 5.24 |
| Architecture codename | Haswell-EP (2014−2015) | Kaby Lake-U (2017) |
| Release date | 13 November 2014 (10 years ago) | 3 January 2017 (7 years ago) |
| Launch price (MSRP) | no data | $107 |
Detailed specifications
Xeon E5-2666 V3 and Celeron 3865U 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 | 10 (Deca-Core) | 2 (Dual-core) |
| Threads | 20 | 2 |
| Base clock speed | 2.9 GHz | 1.8 GHz |
| Boost clock speed | 3.5 GHz | 1.8 GHz |
| Bus type | no data | OPI |
| Bus rate | no data | 4 GT/s |
| Multiplier | no data | 22 |
| L1 cache | 64K (per core) | 64K (per core) |
| L2 cache | 256K (per core) | 256K (per core) |
| L3 cache | 25 MB (shared) | 2 MB (shared) |
| Chip lithography | 22 nm | 14 nm |
| Die size | 356 mm2 | 98.7 mm2 |
| Maximum core temperature | no data | 100 °C |
| Number of transistors | 2,600 million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | no data | - |
Compatibility
Information on Xeon E5-2666 V3 and Celeron 3865U 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 | 1 (Uniprocessor) |
| Socket | 2011-3 | FCBGA1356,FPBGA1356 |
| Power consumption (TDP) | 135 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon E5-2666 V3 and Celeron 3865U. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2 |
| AES-NI | + | + |
| AVX | + | + |
| vPro | + | + |
| Enhanced SpeedStep (EIST) | + | + |
| Speed Shift | no data | + |
| My WiFi | no data | + |
| Turbo Boost Technology | no data | - |
| Hyper-Threading Technology | no data | + |
| TSX | + | - |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | + |
| Smart Response | no data | + |
Security technologies
Xeon E5-2666 V3 and Celeron 3865U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | - |
| EDB | no data | + |
| Secure Key | no data | + |
| MPX | - | + |
| SGX | no data | Yes with Intel® ME |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon E5-2666 V3 and Celeron 3865U are enumerated here.
| AMD-V | - | + |
| VT-d | + | + |
| VT-x | + | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon E5-2666 V3 and Celeron 3865U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3, DDR4 2133 MHz Quad-channel | DDR3, DDR4 |
| Maximum memory size | no data | 32 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 34.134 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | Intel HD Graphics 610 |
| Max video memory | no data | 32 GB |
| Quick Sync Video | - | + |
| Clear Video | no data | + |
| Clear Video HD | no data | + |
| Graphics max frequency | no data | 900 MHz |
Graphics interfaces
Available interfaces and connections of Xeon E5-2666 V3 and Celeron 3865U integrated GPUs.
| Number of displays supported | no data | 3 |
| eDP | no data | + |
| DisplayPort | - | + |
| HDMI | - | + |
| DVI | no data | + |
Graphics image quality
Maximum display resolutions supported by Xeon E5-2666 V3 and Celeron 3865U integrated GPUs, including resolutions over different interfaces.
| 4K resolution support | no data | + |
| Max resolution over HDMI 1.4 | no data | 4096x2304@24Hz |
| Max resolution over eDP | no data | 4096x2304@60Hz |
| Max resolution over DisplayPort | no data | 4096x2304@60Hz |
Graphics API support
APIs supported by Xeon E5-2666 V3 and Celeron 3865U integrated GPUs, sometimes API versions are included.
| DirectX | no data | 12 |
| OpenGL | no data | 4.4 |
Peripherals
Specifications and connection of peripherals supported by Xeon E5-2666 V3 and Celeron 3865U.
| PCIe version | 3.0 | 2.0 |
| PCI Express lanes | 40 | 10 |
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 | 8.93 | 0.83 |
| Recency | 13 November 2014 | 3 January 2017 |
| Physical cores | 10 | 2 |
| Threads | 20 | 2 |
| Chip lithography | 22 nm | 14 nm |
| Power consumption (TDP) | 135 Watt | 15 Watt |
Xeon E5-2666 V3 has a 975.9% higher aggregate performance score, and 400% more physical cores and 900% more threads.
Celeron 3865U, on the other hand, has an age advantage of 2 years, a 57.1% more advanced lithography process, and 800% lower power consumption.
The Xeon E5-2666 V3 is our recommended choice as it beats the Celeron 3865U in performance tests.
Be aware that Xeon E5-2666 V3 is a server/workstation processor while Celeron 3865U is a notebook one.
Should you still have questions on choice between Xeon E5-2666 V3 and Celeron 3865U, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
