Celeron 3855U vs i5-8400
Aggregate performance score
Core i5-8400 outperforms Celeron 3855U by a whopping 655% based on our aggregate benchmark results.
Primary details
Comparing Core i5-8400 and Celeron 3855U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1128 | 2652 |
| Place by popularity | 63 | not in top-100 |
| Cost-effectiveness evaluation | 4.95 | no data |
| Market segment | Desktop processor | Laptop |
| Series | Intel Core i5 | Intel Celeron |
| Power efficiency | 8.46 | 4.86 |
| Architecture codename | Coffee Lake-S (2017−2018) | Skylake (2015−2016) |
| Release date | 24 September 2017 (7 years ago) | 15 August 2015 (9 years ago) |
| Launch price (MSRP) | $182 | $107 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Core i5-8400 and Celeron 3855U 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 | 6 (Hexa-Core) | 2 (Dual-core) |
| Threads | 6 | 2 |
| Base clock speed | 2.8 GHz | 1.6 GHz |
| Boost clock speed | 4 GHz | 1.6 GHz |
| Bus type | DMI 3.0 | OPI |
| Bus rate | 4 × 8 GT/s | 4 GT/s |
| Multiplier | 28 | 16 |
| L1 cache | 384 KB | 128 KB |
| L2 cache | 1.5 MB | 512 KB |
| L3 cache | 9 MB (shared) | 2 MB |
| Chip lithography | 14 nm | 14 nm |
| Die size | 149 mm2 | 98.57 mm2 |
| Maximum core temperature | 100 °C | 100 °C |
| Maximum case temperature (TCase) | 72 °C | no data |
| Number of transistors | no data | 1750 Million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | - |
Compatibility
Information on Core i5-8400 and Celeron 3855U 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) | 1 (Uniprocessor) |
| Socket | FCLGA1151 | FCBGA1356 |
| Power consumption (TDP) | 65 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i5-8400 and Celeron 3855U. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 | Intel® SSE4.1, Intel® SSE4.2 |
| AES-NI | + | + |
| AVX | + | - |
| vPro | + | no data |
| Enhanced SpeedStep (EIST) | + | + |
| My WiFi | no data | + |
| Turbo Boost Technology | 2.0 | - |
| Hyper-Threading Technology | - | - |
| Idle States | + | + |
| Thermal Monitoring | + | + |
| Flex Memory Access | no data | + |
| Smart Response | no data | + |
Security technologies
Core i5-8400 and Celeron 3855U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | - |
| EDB | + | + |
| Secure Key | + | + |
| MPX | + | - |
| Identity Protection | + | + |
| SGX | Yes with Intel® ME | Yes with Intel® ME |
| OS Guard | + | - |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i5-8400 and Celeron 3855U are enumerated here.
| AMD-V | + | - |
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core i5-8400 and Celeron 3855U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3, DDR4 | DDR4-1866/2133, LPDDR3-1600/1866, DDR3L-1333/1600 |
| Maximum memory size | 128 GB | 32 GB |
| Max memory channels | 2 | 2 |
| Maximum memory bandwidth | 42.671 GB/s | 34.134 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card Compare | Intel UHD Graphics 630 | Intel HD Graphics 510 |
| Max video memory | 64 GB | 32 GB |
| Quick Sync Video | + | + |
| Clear Video | + | no data |
| Clear Video HD | + | + |
| Graphics max frequency | 1.05 GHz | 900 MHz |
| InTru 3D | + | no data |
Graphics interfaces
Available interfaces and connections of Core i5-8400 and Celeron 3855U integrated GPUs.
| Number of displays supported | 3 | 3 |
| eDP | no data | + |
| DisplayPort | - | + |
| HDMI | - | + |
| DVI | no data | + |
Graphics image quality
Maximum display resolutions supported by Core i5-8400 and Celeron 3855U integrated GPUs, including resolutions over different interfaces.
| 4K resolution support | + | + |
| Max resolution over HDMI 1.4 | 4096x2304@24Hz | 4096x2304@24Hz |
| Max resolution over eDP | 4096x2304@60Hz | 4096x2304@60Hz |
| Max resolution over DisplayPort | 4096x2304@60Hz | 4096x2304@60Hz |
| Max resolution over VGA | no data | N/A |
Graphics API support
APIs supported by Core i5-8400 and Celeron 3855U integrated GPUs, sometimes API versions are included.
| DirectX | 12 | 12 |
| OpenGL | 4.5 | 4.4 |
Peripherals
Specifications and connection of peripherals supported by Core i5-8400 and Celeron 3855U.
| PCIe version | 3.0 | 2.0 |
| PCI Express lanes | 16 | 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.
GeekBench 5 Single-Core
GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.
GeekBench 5 Multi-Core
GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.
Pros & cons summary
| Performance score | 5.81 | 0.77 |
| Integrated graphics card | 3.09 | 1.61 |
| Recency | 24 September 2017 | 15 August 2015 |
| Physical cores | 6 | 2 |
| Threads | 6 | 2 |
| Power consumption (TDP) | 65 Watt | 15 Watt |
i5-8400 has a 654.5% higher aggregate performance score, 91.9% faster integrated GPU, an age advantage of 2 years, and 200% more physical cores and 200% more threads.
Celeron 3855U, on the other hand, has 333.3% lower power consumption.
The Core i5-8400 is our recommended choice as it beats the Celeron 3855U in performance tests.
Note that Core i5-8400 is a desktop processor while Celeron 3855U is a notebook one.
Should you still have questions on choice between Core i5-8400 and Celeron 3855U, ask them in Comments section, and we shall answer.
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