AMD Ryzen 5 6600U vs AMD Athlon II X4 645
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CPU comparison with benchmarks
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| AMD Ryzen 5 6600U | AMD Athlon II X4 645 | |
CPU comparisonAMD Ryzen 5 6600U or AMD Athlon II X4 645 - 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 AMD Ryzen 5 6600U has 6 cores with 12 threads and clocks with a maximum frequency of 4.40 GHz. Up to 64 GB of memory is supported in 2 memory channels. The AMD Ryzen 5 6600U was released in Q1/2022. The AMD Athlon II X4 645 has 4 cores with 4 threads and clocks with a maximum frequency of 3.10 GHz. The CPU supports up to 16 GB of memory in 2 memory channels. The AMD Athlon II X4 645 was released in Q3/2010. |
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| AMD Ryzen 5 (86) | Family | AMD Athlon II (52) |
| AMD Ryzen 6000U/7035U (9) | CPU group | AMD Athlon II X4 (Propus) (10) |
| 5 | Generation | 1 |
| Rembrandt (Zen 3+) | Architecture | Propus |
| Mobile | Segment | Desktop / Server |
| AMD Ryzen 5 5600U | Predecessor | -- |
| -- | Successor | -- |
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CPU Cores and Base FrequencyThe AMD Ryzen 5 6600U has 6 CPU cores and can calculate 12 threads in parallel. The clock frequency of the AMD Ryzen 5 6600U is 2.90 GHz (4.40 GHz) while the AMD Athlon II X4 645 has 4 CPU cores and 4 threads can calculate simultaneously. The clock frequency of the AMD Athlon II X4 645 is at 3.10 GHz. |
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| AMD Ryzen 5 6600U | Characteristic | AMD Athlon II X4 645 |
| 6 | Cores | 4 |
| 12 | Threads | 4 |
| normal | Core architecture | normal |
| Yes | Hyperthreading | No |
| No | Overclocking ? | No |
| 2.90 GHz | Frequency | 3.10 GHz |
| 4.40 GHz | Turbo Frequency (1 Core) | -- |
| 3.80 GHz | Turbo Frequency (All Cores) | -- |
Integrated graphics (iGPU)The AMD Ryzen 5 6600U or AMD Athlon II X4 645 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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| AMD Radeon 660M | GPU | no iGPU |
| 1.40 GHz | GPU frequency | -- |
| 1.90 GHz | GPU (Turbo) | -- |
| 9 | GPU Generation | -- |
| 6 nm | Technology | |
| 3 | Max. displays | |
| 6 | Compute units | -- |
| 384 | Shader | -- |
| Yes | Hardware Raytracing | No |
| No | Frame Generation | No |
| 8 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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| AMD Radeon 660M | 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 |
| Decode | Codec AV1 | No |
| Decode / Encode | Codec AVC | No |
| Decode | Codec VC-1 | No |
| Decode / Encode | Codec JPEG | No |
Memory & PCIeThe AMD Ryzen 5 6600U can use up to 64 GB of memory in 2 memory channels. The maximum memory bandwidth is 76.8 GB/s. The AMD Athlon II X4 645 supports up to 16 GB of memory in 2 memory channels and achieves a memory bandwidth of up to 21.3 GB/s. |
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| AMD Ryzen 5 6600U | Characteristic | AMD Athlon II X4 645 |
| LPDDR5-6400, DDR5-4800 | Memory | DDR3-1333 |
| 64 GB | Max. Memory | 16 GB |
| 2 (Dual Channel) | Memory channels | 2 (Dual Channel) |
| 76.8 GB/s | Max. Bandwidth | 21.3 GB/s |
| No | ECC | No |
| 3.00 MB | L2 Cache | 2.00 MB |
| 16.00 MB | L3 Cache | -- |
| 4.0 | PCIe version | 2.0 |
| 12 | PCIe lanes | -- |
| 23.6 GB/s | PCIe Bandwidth | -- |
Thermal ManagementThe thermal design power (TDP for short) of the AMD Ryzen 5 6600U is 15 W, while the AMD Athlon II X4 645 has a TDP of 95 W. The TDP specifies the necessary cooling solution that is required to cool the processor sufficiently. |
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| AMD Ryzen 5 6600U | Characteristic | AMD Athlon II X4 645 |
| 15 W | TDP (PL1 / PBP) | 95 W |
| -- | TDP (PL2) | -- |
| 28 W | TDP up | -- |
| -- | TDP down | -- |
| 105 °C | Tjunction max. | -- |
Technical detailsThe AMD Ryzen 5 6600U is manufactured in 6 nm and has 19.00 MB cache. The AMD Athlon II X4 645 is manufactured in 45 nm and has a 2.00 MB cache. |
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| AMD Ryzen 5 6600U | Characteristic | AMD Athlon II X4 645 |
| 6 nm | Technology | 45 nm |
| Monolithic | Chip design | Unknown |
| x86-64 (64 bit) | Instruction set (ISA) | x86-64 (64 bit) |
| SSE4a, SSE4.1, SSE4.2, AVX2, FMA3 | ISA extensions | MMX, 3DNow!, SSE3, SSE4a |
| FP7 | Socket | AM3 |
| AMD-V, SVM | Virtualization | AMD-V |
| Yes | AES-NI | No |
| Windows 10, Windows 11, Linux | Operating systems | Windows 10, Linux |
| Q1/2022 | Release date | Q3/2010 |
| -- | Release price | -- |
| show more data | show more data | |
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Rate these processors
Average performance in benchmarks
⌀ Single core performance in 2 CPU benchmarks
⌀ Multi core performance in 3 CPU benchmarks
Cinebench R23 (Single-Core)
Cinebench R23 is the successor of Cinebench R20 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 Ryzen 5 6600U
6C 12T @ 4.40 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 GHz |
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Cinebench R23 (Multi-Core)
Cinebench R23 is the successor of Cinebench R20 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 Ryzen 5 6600U
6C 12T @ 3.80 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 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 Ryzen 5 6600U
6C 12T @ 4.40 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 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 Ryzen 5 6600U
6C 12T @ 3.80 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 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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AMD Ryzen 5 6600U
6C 12T @ 3.80 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 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 Ryzen 5 6600U
6C 12T @ 4.40 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 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 Ryzen 5 6600U
6C 12T @ 3.80 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 GHz |
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Cinebench R20 (Single-Core)
Cinebench R20 is the successor of Cinebench R15 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 Ryzen 5 6600U
6C 12T @ 4.40 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 GHz |
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Cinebench R20 (Multi-Core)
Cinebench R20 is the successor of Cinebench R15 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 Ryzen 5 6600U
6C 12T @ 3.80 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 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 Ryzen 5 6600U
AMD Radeon 660M @ 1.90 GHz |
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AMD Athlon II X4 645
@ 0.00 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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AMD Ryzen 5 6600U
6C 12T @ 2.90 GHz |
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AMD Athlon II X4 645
4C 4T @ 3.10 GHz |
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Devices using this processor |
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| AMD Ryzen 5 6600U | AMD Athlon II X4 645 |
| Unknown | Unknown |
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