Qualcomm Snapdragon 821 | AMD EPYC Embedded 3255 | |
CPU comparisonQualcomm Snapdragon 821 or AMD EPYC Embedded 3255 - 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 Qualcomm Snapdragon 821 has 4 cores with 4 threads and clocks with a maximum frequency of 2.40 GHz. Up to 8 GB of memory is supported in 2 memory channels. The Qualcomm Snapdragon 821 was released in Q3/2016. The AMD EPYC Embedded 3255 has 8 cores with 16 threads and clocks with a maximum frequency of 3.10 GHz. The CPU supports up to 512 GB of memory in 2 memory channels. The AMD EPYC Embedded 3255 was released in Q1/2018. |
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Qualcomm Snapdragon (104) | Family | AMD EPYC (129) |
Qualcomm Snapdragon 820 (3) | CPU group | AMD EPYC Embedded 3000 (7) |
3 | Generation | 1 |
Kryo | Architecture | Snowy Owl (Zen) |
Mobile | Segment | Desktop / Server |
-- | Predecessor | -- |
-- | Successor | -- |
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CPU Cores and Base FrequencyThe Qualcomm Snapdragon 821 is a 4 core processor with a clock frequency of 2.40 GHz. The AMD EPYC Embedded 3255 has 8 CPU cores with a clock frequency of 2.50 GHz (3.10 GHz). |
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Qualcomm Snapdragon 821 | Characteristic | AMD EPYC Embedded 3255 |
4 | Cores | 8 |
4 | Threads | 16 |
hybrid (big.LITTLE) | Core architecture | normal |
No | Hyperthreading | Yes |
No | Overclocking ? | Yes |
2.40 GHz 2x Kryo |
A-Core | 2.50 GHz (3.10 GHz) |
1.60 GHz 2x Kryo |
B-Core | -- |
NPU AI performanceThe performance values of the processor's AI unit. The isolated NPU performance is specified here, the total AI performance (NPU+CPU+iGPU) can be higher. Processors with support for artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors. |
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Qualcomm Snapdragon 821 | Characteristic | AMD EPYC Embedded 3255 |
Qualcomm AI engine | AI hardware | -- |
Hexagon 680 | AI specifications | -- |
-- | NPU + CPU + iGPU | -- |
Integrated graphics (iGPU)The integrated graphics unit of a processor is not only responsible for the pure image output on the system, but can also significantly increase the efficiency of the system with the support of modern video codecs. |
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Qualcomm Adreno 530 | GPU | no iGPU |
0.62 GHz | GPU frequency | -- |
0.62 GHz | GPU (Turbo) | -- |
5 | GPU Generation | -- |
14 nm | Technology | |
0 | Max. displays | |
-- | Compute units | -- |
256 | Shader | -- |
No | Hardware Raytracing | No |
No | Frame Generation | No |
-- | Max. GPU Memory | -- |
11,1 | 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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Qualcomm Adreno 530 | GPU | no iGPU |
Decode | Codec h265 / HEVC (8 bit) | No |
No | Codec h265 / HEVC (10 bit) | No |
Decode | Codec h264 | No |
Decode | Codec VP9 | No |
Decode | Codec VP8 | No |
No | Codec AV1 | No |
No | Codec AVC | No |
Decode | Codec VC-1 | No |
Decode | Codec JPEG | No |
Memory & PCIeThe Qualcomm Snapdragon 821 supports a maximum of 8 GB of memory in 2 memory channels. The AMD EPYC Embedded 3255 can connect up to 512 GB of memory in 2 memory channels. |
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Qualcomm Snapdragon 821 | Characteristic | AMD EPYC Embedded 3255 |
LPDDR4-3733 | Memory | DDR4-2666 |
8 GB | Max. Memory | 512 GB |
2 (Dual Channel) | Memory channels | 2 (Dual Channel) |
14.9 GB/s | Max. Bandwidth | 42.7 GB/s |
No | ECC | Yes |
-- | L2 Cache | 4.00 MB |
-- | L3 Cache | 16.00 MB |
-- | PCIe version | 3.0 |
-- | PCIe lanes | 32 |
-- | PCIe Bandwidth | 31.5 GB/s |
Thermal ManagementThe TDP (Thermal Design Power) of a processor specifies the required cooling solution. The Qualcomm Snapdragon 821 has a TDP of --, that of the AMD EPYC Embedded 3255 is 55 W. |
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Qualcomm Snapdragon 821 | Characteristic | AMD EPYC Embedded 3255 |
-- | TDP (PL1 / PBP) | 55 W |
-- | TDP (PL2) | -- |
-- | TDP up | -- |
-- | TDP down | 25 W |
-- | Tjunction max. | 105 °C |
Technical detailsThe Qualcomm Snapdragon 821 has a 0.00 MB cache, while the AMD EPYC Embedded 3255 cache has a total of 20.00 MB. |
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Qualcomm Snapdragon 821 | Characteristic | AMD EPYC Embedded 3255 |
14 nm | Technology | 14 nm |
Chiplet | Chip design | Chiplet |
Armv8-A (64 bit) | Instruction set (ISA) | x86-64 (64 bit) |
-- | ISA extensions | SSE4a, SSE4.1, SSE4.2, AVX2, FMA3 |
-- | Socket | SP4r2 |
None | Virtualization | AMD-V, SVM |
No | AES-NI | Yes |
Android | Operating systems | Windows 10, Linux |
Q3/2016 | Release date | Q1/2018 |
-- | Release price | -- |
show more data | show more data | |
Qualcomm Snapdragon 821
4C 4T @ 2.40 GHz |
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AMD EPYC Embedded 3255
8C 16T @ 3.10 GHz |
Qualcomm Snapdragon 821
4C 4T @ 2.40 GHz |
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AMD EPYC Embedded 3255
8C 16T @ 2.50 GHz |
Qualcomm Snapdragon 821
4C 4T @ 2.40 GHz |
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AMD EPYC Embedded 3255
8C 16T @ 3.10 GHz |
Qualcomm Snapdragon 821
4C 4T @ 2.40 GHz |
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AMD EPYC Embedded 3255
8C 16T @ 2.50 GHz |
Qualcomm Snapdragon 821
Qualcomm Adreno 530 @ 0.62 GHz |
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AMD EPYC Embedded 3255
@ 0.00 GHz |
Qualcomm Snapdragon 821
4C 4T @ 2.40 GHz |
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AMD EPYC Embedded 3255
8C 16T @ 2.50 GHz |
Devices using this processor |
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Qualcomm Snapdragon 821 | AMD EPYC Embedded 3255 |
Unknown | Unknown |