Intel Core i5-8400B vs Intel Atom C3955
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CPU comparison with benchmarks
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| Intel Core i5-8400B | Intel Atom C3955 | |
CPU comparisonIn this CPU comparison, we compare the Intel Core i5-8400B and the Intel Atom C3955 and use benchmarks to check which processor is faster.
We compare the Intel Core i5-8400B 6 core processor released in Q2/2018 with the Intel Atom C3955 which has 16 CPU cores and was introduced in Q3/2017. |
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| Intel Core i5 (331) | Family | Intel Atom (108) |
| Intel Core i 8000 (20) | CPU group | Intel Atom C3000 (20) |
| 8 | Generation | 5 |
| Coffee Lake S | Architecture | Denverton |
| Desktop / Server | Segment | Desktop / Server |
| -- | Predecessor | -- |
| -- | Successor | -- |
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CPU Cores and Base FrequencyThe Intel Core i5-8400B is a 6 core processor with a clock frequency of 2.80 GHz (3.80 GHz). The processor can compute 6 threads at the same time. The Intel Atom C3955 clocks with 2.10 GHz (2.40 GHz), has 16 CPU cores and can calculate 16 threads in parallel. |
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| Intel Core i5-8400B | Characteristic | Intel Atom C3955 |
| 6 | Cores | 16 |
| 6 | Threads | 16 |
| normal | Core architecture | normal |
| No | Hyperthreading | No |
| No | Overclocking ? | No |
| 2.80 GHz | Frequency | 2.10 GHz |
| 3.80 GHz | Turbo Frequency (1 Core) | 2.40 GHz |
| 4.00 GHz | Turbo Frequency (All Cores) | 2.40 GHz |
Integrated graphics (iGPU)Graphics (iGPU) integrated into the processor not only enable image output without having to rely on a dedicated graphics solution, but can also efficiently accelerate video playback. |
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| Intel UHD Graphics 630 | GPU | no iGPU |
| 0.35 GHz | GPU frequency | -- |
| 1.15 GHz | GPU (Turbo) | -- |
| 9.5 | GPU Generation | -- |
| 14 nm | Technology | |
| 3 | Max. displays | |
| 24 | Compute units | -- |
| 192 | Shader | -- |
| No | Hardware Raytracing | No |
| No | Frame Generation | No |
| 64 GB | Max. GPU Memory | -- |
| 12 | DirectX Version | -- |
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 | no iGPU |
| Decode / Encode | Codec h265 / HEVC (8 bit) | No |
| Decode / Encode | Codec h265 / HEVC (10 bit) | No |
| Decode / Encode | Codec h264 | No |
| Decode / Encode | Codec VP9 | No |
| Decode / Encode | Codec VP8 | No |
| No | Codec AV1 | No |
| Decode / Encode | Codec AVC | No |
| Decode | Codec VC-1 | No |
| Decode / Encode | Codec JPEG | No |
Memory & PCIeUp to 64 GB of memory in a maximum of 2 memory channels is supported by the Intel Core i5-8400B, while the Intel Atom C3955 supports a maximum of 256 GB of memory with a maximum memory bandwidth of 38.4 GB/s enabled. |
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| Intel Core i5-8400B | Characteristic | Intel Atom C3955 |
| DDR4-2666 | Memory | DDR4-2400 |
| 64 GB | Max. Memory | 256 GB |
| 2 (Dual Channel) | Memory channels | 2 (Dual Channel) |
| 42.7 GB/s | Max. Bandwidth | 38.4 GB/s |
| No | ECC | Yes |
| -- | L2 Cache | 16.00 MB |
| 9.00 MB | L3 Cache | -- |
| 3.0 | PCIe version | 3.0 |
| 16 | PCIe lanes | 16 |
| 15.8 GB/s | PCIe Bandwidth | 15.8 GB/s |
Thermal ManagementThe Intel Core i5-8400B has a TDP of 65 W. The TDP of the Intel Atom C3955 is 32 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution. |
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| Intel Core i5-8400B | Characteristic | Intel Atom C3955 |
| 65 W | TDP (PL1 / PBP) | 32 W |
| -- | TDP (PL2) | -- |
| -- | TDP up | -- |
| -- | TDP down | -- |
| 100 °C | Tjunction max. | 100 °C |
Technical detailsThe Intel Core i5-8400B has 9.00 MB cache and is manufactured in 14 nm. The cache of Intel Atom C3955 is at 16.00 MB. The processor is manufactured in 14 nm. |
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| Intel Core i5-8400B | Characteristic | Intel Atom C3955 |
| 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 |
| BGA 1440 | Socket | BGA 1310 |
| 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 | Q3/2017 |
| 260 $ | Release price | 434 $ |
| show more data | show more data | |
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6C 6T @ 2.80 GHz (3.80 GHz) buy now on Amazon and save!
16C 16T @ 2.10 GHz (2.40 GHz) buy now on Amazon and save!
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Rate these processors
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 i5-8400B
6C 6T @ 3.80 GHz |
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Intel Atom C3955
16C 16T @ 2.40 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 i5-8400B
6C 6T @ 4.00 GHz |
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Intel Atom C3955
16C 16T @ 2.40 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 i5-8400B
Intel UHD Graphics 630 @ 1.15 GHz |
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Intel Atom C3955
@ 0.00 GHz |
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Blender 3.1 Benchmark
In the Blender Benchmark 3.1, the scenes "monster", "junkshop" and "classroom" are rendered and the time required by the system is measured. In our benchmark we test the CPU and not the graphics card. Blender 3.1 was presented as a standalone version in March 2022.
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Intel Core i5-8400B
6C 6T @ 4.00 GHz |
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Intel Atom C3955
16C 16T @ 2.40 GHz |
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Devices using this processor |
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| Intel Core i5-8400B | Intel Atom C3955 |
| Unknown | Unknown |
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