AMD Phenom II X2 521 vs Intel Pentium 3805U
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CPU comparison with benchmarks
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| AMD Phenom II X2 521 | Intel Pentium 3805U | |
CPU comparisonIn this CPU comparison, we compare the AMD Phenom II X2 521 and the Intel Pentium 3805U and use benchmarks to check which processor is faster.
We compare the AMD Phenom II X2 521 2 core processor released in Q2/2011 with the Intel Pentium 3805U which has 2 CPU cores and was introduced in Q1/2015. |
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| AMD Phenom II (52) | Family | Intel Pentium (150) |
| AMD Phenom II - 500 (2) | CPU group | Intel Pentium 3000 (8) |
| 1 | Generation | 4 |
| Regor (K10) | Architecture | Haswell U |
| Desktop / Server | Segment | Mobile |
| -- | Predecessor | -- |
| -- | Successor | -- |
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CPU Cores and Base FrequencyThe AMD Phenom II X2 521 is a 2 core processor with a clock frequency of 3.50 GHz. The processor can compute 2 threads at the same time. The Intel Pentium 3805U clocks with 1.90 GHz, has 2 CPU cores and can calculate 2 threads in parallel. |
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| AMD Phenom II X2 521 | Characteristic | Intel Pentium 3805U |
| 2 | Cores | 2 |
| 2 | Threads | 2 |
| normal | Core architecture | normal |
| No | Hyperthreading | No |
| Yes | Overclocking ? | No |
| 3.50 GHz | Frequency | 1.90 GHz |
| -- | Turbo Frequency (1 Core) | -- |
| -- | Turbo Frequency (All Cores) | -- |
Internal GraphicsGraphics (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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| no iGPU | GPU | Intel HD Graphics (Broadwell GT1) |
| GPU frequency | 0.10 GHz | |
| -- | GPU (Turbo) | 0.80 GHz |
| -- | GPU Generation | 8 |
| Technology | 14 nm | |
| Max. displays | 3 | |
| -- | Compute units | 12 |
| -- | Shader | 96 |
| No | Hardware Raytracing | No |
| No | Frame Generation | No |
| -- | Max. GPU Memory | 2 GB |
| -- | DirectX Version | 11.2 |
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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| no iGPU | GPU | Intel HD Graphics (Broadwell GT1) |
| No | Codec h265 / HEVC (8 bit) | No |
| No | Codec h265 / HEVC (10 bit) | No |
| No | Codec h264 | Decode / Encode |
| No | Codec VP9 | No |
| No | Codec VP8 | Decode |
| No | Codec AV1 | No |
| No | Codec AVC | Decode / Encode |
| No | Codec VC-1 | Decode |
| No | Codec JPEG | Decode |
Memory & PCIeUp to GB of memory in a maximum of 2 memory channels is supported by the AMD Phenom II X2 521, while the Intel Pentium 3805U supports a maximum of 16 GB of memory with a maximum memory bandwidth of 25.6 GB/s enabled. |
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| AMD Phenom II X2 521 | Characteristic | Intel Pentium 3805U |
| DDR3-1333, DDR2-1066 | Memory | DDR3-1600 |
| Max. Memory | 16 GB | |
| 2 (Dual Channel) | Memory channels | 2 (Dual Channel) |
| 21.3 GB/s | Max. Bandwidth | 25.6 GB/s |
| No | ECC | No |
| -- | L2 Cache | -- |
| 2.00 MB | L3 Cache | 2.00 MB |
| -- | PCIe version | 2.0 |
| -- | PCIe lanes | 12 |
| -- | PCIe Bandwidth | 6.0 GB/s |
Thermal ManagementThe AMD Phenom II X2 521 has a TDP of 65 W. The TDP of the Intel Pentium 3805U is 15 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution. |
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| AMD Phenom II X2 521 | Characteristic | Intel Pentium 3805U |
| 65 W | TDP (PL1 / PBP) | 15 W |
| -- | TDP (PL2) | -- |
| -- | TDP up | -- |
| -- | TDP down | -- |
| -- | Tjunction max. | -- |
Technical detailsThe AMD Phenom II X2 521 has 2.00 MB cache and is manufactured in 45 nm. The cache of Intel Pentium 3805U is at 2.00 MB. The processor is manufactured in 22 nm. |
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| AMD Phenom II X2 521 | Characteristic | Intel Pentium 3805U |
| 45 nm | Technology | 22 nm |
| Unknown | Chip design | Monolithic |
| x86-64 (64 bit) | Instruction set (ISA) | x86-64 (64 bit) |
| SSE3, SSE4a | ISA extensions | SSE4.1, SSE4.2 |
| AM3 | Socket | BGA 1168 |
| AMD-V | Virtualization | VT-x, VT-x EPT, VT-d |
| No | AES-NI | Yes |
| Windows 10, Linux | Operating systems | Windows 10, Linux |
| Q2/2011 | Release date | Q1/2015 |
| 35 $ | Release price | -- |
| show more data | show more data | |
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2C 2T @ 1.90 GHz buy now on Amazon and save!
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Rate these processors
Average performance in benchmarks
⌀ Single core performance in 1 CPU benchmarks
⌀ Multi core performance in 2 CPU benchmarks
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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AMD Phenom II X2 521
2C 2T @ 3.50 GHz |
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Intel Pentium 3805U
2C 2T @ 1.90 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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AMD Phenom II X2 521
2C 2T @ 3.50 GHz |
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Intel Pentium 3805U
2C 2T @ 1.90 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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AMD Phenom II X2 521
2C 2T @ 3.50 GHz |
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Intel Pentium 3805U
2C 2T @ 1.90 GHz |
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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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AMD Phenom II X2 521
2C 2T @ 3.50 GHz |
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Intel Pentium 3805U
2C 2T @ 1.90 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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AMD Phenom II X2 521
2C 2T @ 3.50 GHz |
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Intel Pentium 3805U
2C 2T @ 1.90 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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AMD Phenom II X2 521
2C 2T @ 3.50 GHz |
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Intel Pentium 3805U
2C 2T @ 1.90 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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AMD Phenom II X2 521
2C 2T @ 3.50 GHz |
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Intel Pentium 3805U
2C 2T @ 1.90 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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AMD Phenom II X2 521
@ 0.00 GHz |
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Intel Pentium 3805U
Intel HD Graphics (Broadwell GT1) @ 0.80 GHz |
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Devices using this processor |
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| AMD Phenom II X2 521 | Intel Pentium 3805U |
| Unknown | Unknown |
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