Intel Core i5-8400T vs Intel Celeron 3855U
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CPU comparison with benchmarks
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| Intel Core i5-8400T | Intel Celeron 3855U | |
CPU comparisonIntel Core i5-8400T or Intel Celeron 3855U - which processor is faster? In this comparison we look at the differences and analyze which of these two CPUs is better. We compare the technical data and benchmark results.
The Intel Core i5-8400T has 6 cores with 6 threads and clocks with a maximum frequency of 3.30 GHz. Up to 128 GB of memory is supported in 2 memory channels. The Intel Core i5-8400T was released in Q2/2018. The Intel Celeron 3855U has 2 cores with 2 threads and clocks with a maximum frequency of 1.60 GHz. The CPU supports up to 32 GB of memory in 2 memory channels. The Intel Celeron 3855U was released in Q4/2015. |
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| Intel Core i5 (331) | Family | Intel Celeron (165) |
| Intel Core i 8000 (20) | CPU group | Intel Celeron 3000 (10) |
| 8 | Generation | 7 |
| Coffee Lake S | Architecture | Kaby Lake U |
| Desktop / Server | Segment | Mobile |
| Intel Core i5-7400T | Predecessor | -- |
| Intel Core i5-9400T | Successor | -- |
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CPU Cores and Base FrequencyThe Intel Core i5-8400T has 6 CPU cores and can calculate 6 threads in parallel. The clock frequency of the Intel Core i5-8400T is 1.70 GHz (3.30 GHz) while the Intel Celeron 3855U has 2 CPU cores and 2 threads can calculate simultaneously. The clock frequency of the Intel Celeron 3855U is at 1.60 GHz. |
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| Intel Core i5-8400T | Characteristic | Intel Celeron 3855U |
| 6 | Cores | 2 |
| 6 | Threads | 2 |
| normal | Core architecture | normal |
| No | Hyperthreading | No |
| Yes | Overclocking ? | No |
| 1.70 GHz | Frequency | 1.60 GHz |
| 3.30 GHz | Turbo Frequency (1 Core) | -- |
| 2.80 GHz | Turbo Frequency (All Cores) | -- |
Internal GraphicsThe Intel Core i5-8400T or Intel Celeron 3855U has integrated graphics, called iGPU for short. The iGPU uses the system's main memory as graphics memory and sits on the processor's die. |
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| Intel UHD Graphics 630 | GPU | Intel HD Graphics 510 |
| 0.35 GHz | GPU frequency | 0.30 GHz |
| 1.15 GHz | GPU (Turbo) | 0.90 GHz |
| 9.5 | GPU Generation | 9 |
| 14 nm | Technology | 14 nm |
| 3 | Max. displays | 3 |
| 24 | Compute units | 12 |
| 192 | Shader | 96 |
| No | Hardware Raytracing | No |
| No | Frame Generation | No |
| 64 GB | Max. GPU Memory | 32 GB |
| 12 | DirectX Version | 12.0 |
Hardware codec supportA photo or video codec that is accelerated in hardware can greatly accelerate the working speed of a processor and extend the battery life of notebooks or smartphones when playing videos. |
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| Intel UHD Graphics 630 | GPU | Intel HD Graphics 510 |
| Decode / Encode | Codec h265 / HEVC (8 bit) | Decode / Encode |
| Decode / Encode | Codec h265 / HEVC (10 bit) | Decode |
| Decode / Encode | Codec h264 | Decode / Encode |
| Decode / Encode | Codec VP9 | Decode |
| Decode / Encode | Codec VP8 | Decode / Encode |
| No | Codec AV1 | No |
| Decode / Encode | Codec AVC | Decode / Encode |
| Decode | Codec VC-1 | Decode |
| Decode / Encode | Codec JPEG | Decode |
Memory & PCIeThe Intel Core i5-8400T can use up to 128 GB of memory in 2 memory channels. The maximum memory bandwidth is 42.7 GB/s. The Intel Celeron 3855U supports up to 32 GB of memory in 2 memory channels and achieves a memory bandwidth of up to 34.1 GB/s. |
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| Intel Core i5-8400T | Characteristic | Intel Celeron 3855U |
| DDR4-2666 | Memory | LPDDR3-1866, DDR4-2133, DDR3L-1600 |
| 128 GB | Max. Memory | 32 GB |
| 2 (Dual Channel) | Memory channels | 2 (Dual Channel) |
| 42.7 GB/s | Max. Bandwidth | 34.1 GB/s |
| No | ECC | No |
| -- | L2 Cache | -- |
| 9.00 MB | L3 Cache | 2.00 MB |
| 3.0 | PCIe version | 2.0 |
| 16 | PCIe lanes | 10 |
| 15.8 GB/s | PCIe Bandwidth | 5.0 GB/s |
Thermal ManagementThe thermal design power (TDP for short) of the Intel Core i5-8400T is 95 W, while the Intel Celeron 3855U has a TDP of 15 W. The TDP specifies the necessary cooling solution that is required to cool the processor sufficiently. |
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| Intel Core i5-8400T | Characteristic | Intel Celeron 3855U |
| 95 W | TDP (PL1 / PBP) | 15 W |
| -- | TDP (PL2) | -- |
| -- | TDP up | -- |
| -- | TDP down | 10 W |
| -- | Tjunction max. | 100 °C |
Technical detailsThe Intel Core i5-8400T is manufactured in 14 nm and has 9.00 MB cache. The Intel Celeron 3855U is manufactured in 14 nm and has a 2.00 MB cache. |
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| Intel Core i5-8400T | Characteristic | Intel Celeron 3855U |
| 14 nm | Technology | 14 nm |
| Monolithic | Chip design | Monolithic |
| x86-64 (64 bit) | Instruction set (ISA) | x86-64 (64 bit) |
| SSE4.1, SSE4.2, AVX2 | ISA extensions | SSE4.1, SSE4.2 |
| LGA 1151-2 | Socket | -- |
| VT-x, VT-x EPT, VT-d | Virtualization | VT-x, VT-x EPT, VT-d |
| Yes | AES-NI | Yes |
| Windows 10, Windows 11, Linux | Operating systems | Windows 10, Linux |
| Q2/2018 | Release date | Q4/2015 |
| 260 $ | Release price | 107 $ |
| show more data | show more data | |
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Rate these processors
Average performance in benchmarks
⌀ Single core performance in 3 CPU benchmarks
⌀ Multi core performance in 4 CPU benchmarks
Geekbench 5, 64bit (Single-Core)
Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
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Intel Core i5-8400T
6C 6T @ 3.30 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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Geekbench 5, 64bit (Multi-Core)
Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
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Intel Core i5-8400T
6C 6T @ 2.80 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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Geekbench 6 (Single-Core)
Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The single-core benchmark only evaluates the performance of the fastest CPU core, the number of CPU cores in a processor is irrelevant here.
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Intel Core i5-8400T
6C 6T @ 3.30 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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Geekbench 6 (Multi-Core)
Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The multi-core benchmark evaluates the performance of all of the processor's CPU cores. Virtual thread improvements such as AMD SMT or Intel's Hyper-Threading have a positive impact on the benchmark result.
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Intel Core i5-8400T
6C 6T @ 2.80 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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iGPU - FP32 Performance (Single-precision GFLOPS)
The theoretical computing performance of the internal graphics unit of the processor with simple accuracy (32 bit) in GFLOPS. GFLOPS indicates how many billion floating point operations the iGPU can perform per second.
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Intel Core i5-8400T
Intel UHD Graphics 630 @ 1.15 GHz |
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Intel Celeron 3855U
Intel HD Graphics 510 @ 0.90 GHz |
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Estimated results for PassMark CPU Mark
Some of the CPUs listed below have been benchmarked by CPU-monkey. However the majority of CPUs have not been tested and the results have been estimated by a CPU-monkey’s secret proprietary formula. As such they do not accurately reflect the actual Passmark CPU mark values and are not endorsed by PassMark Software Pty Ltd.
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Intel Core i5-8400T
6C 6T @ 2.80 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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Cinebench R15 (Single-Core)
Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
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Intel Core i5-8400T
6C 6T @ 3.30 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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Cinebench R15 (Multi-Core)
Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
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Intel Core i5-8400T
6C 6T @ 2.80 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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Cinebench 2024 (Single-Core)
The Cinebench 2024 benchmark is based on the Redshift rendering engine, which is also used in Maxon's 3D program Cinema 4D. The benchmark runs are each 10 minutes long to test whether the processor is limited by its heat generation.
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Intel Core i5-8400T
6C 6T @ 3.30 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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Cinebench 2024 (Multi-Core)
The Multi-Core test of the Cinebench 2024 benchmark uses all cpu cores to render using the Redshift rendering engine, which is also used in Maxons Cinema 4D. The benchmark run is 10 minutes long to test whether the processor is limited by its heat generation.
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Intel Core i5-8400T
6C 6T @ 3.30 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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CPU-Z Benchmark 17 (Multi-Core)
The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.
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Intel Core i5-8400T
6C 6T @ 1.70 GHz |
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Intel Celeron 3855U
2C 2T @ 1.60 GHz |
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Devices using this processor |
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| Intel Core i5-8400T | Intel Celeron 3855U |
| Unknown | Unknown |
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