Athlon 300U vs Athlon II X4 645
Aggregate performance score
Athlon 300U outperforms Athlon II X4 645 by an impressive 64% based on our aggregate benchmark results.
Primary details
Comparing Athlon II X4 645 and Athlon 300U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2153 | 1756 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 3.30 | no data |
| Market segment | Desktop processor | Laptop |
| Series | no data | AMD Athlon |
| Power efficiency | 1.47 | 15.33 |
| Architecture codename | Propus (2009−2011) | Raven Ridge 2 (2019) |
| Release date | 21 September 2010 (14 years ago) | 6 January 2019 (5 years ago) |
| Launch price (MSRP) | $80 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Athlon II X4 645 and Athlon 300U basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.
| Physical cores | 4 (Quad-Core) | 2 (Dual-core) |
| Threads | 4 | 4 |
| Base clock speed | 3.1 GHz | 2.4 GHz |
| Boost clock speed | 3.1 GHz | 3.3 GHz |
| Bus type | no data | PCIe 3.0 |
| Multiplier | no data | 24 |
| L1 cache | 128 KB (per core) | 128K (per core) |
| L2 cache | 512 KB (per core) | 512K (per core) |
| L3 cache | 0 KB | 4 MB (shared) |
| Chip lithography | 45 nm | 14 nm |
| Die size | 169 mm2 | 209.78 mm2 |
| Number of transistors | 300 million | 4940 Million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
Compatibility
Information on Athlon II X4 645 and Athlon 300U compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.
| Number of CPUs in a configuration | 1 | 1 (Uniprocessor) |
| Socket | AM3 | FP5 |
| Power consumption (TDP) | 95 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Athlon II X4 645 and Athlon 300U. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | XFR, FMA3, SSE 4.2, AVX2, SMT |
| AES-NI | - | + |
| AVX | - | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Athlon II X4 645 and Athlon 300U are enumerated here.
| AMD-V | - | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon II X4 645 and Athlon 300U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR4 Dual-channel |
| Maximum memory size | no data | 64 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 38.397 GB/s |
| ECC memory support | - | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | AMD Radeon RX Vega 3 |
Peripherals
Specifications and connection of peripherals supported by Athlon II X4 645 and Athlon 300U.
| PCIe version | 2.0 | 3.0 |
| PCI Express lanes | no data | 12 |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.
Pros & cons summary
| Performance score | 1.48 | 2.43 |
| Recency | 21 September 2010 | 6 January 2019 |
| Physical cores | 4 | 2 |
| Chip lithography | 45 nm | 14 nm |
| Power consumption (TDP) | 95 Watt | 15 Watt |
Athlon II X4 645 has 100% more physical cores.
Athlon 300U, on the other hand, has a 64.2% higher aggregate performance score, an age advantage of 8 years, a 221.4% more advanced lithography process, and 533.3% lower power consumption.
The Athlon 300U is our recommended choice as it beats the Athlon II X4 645 in performance tests.
Note that Athlon II X4 645 is a desktop processor while Athlon 300U is a notebook one.
Should you still have questions on choice between Athlon II X4 645 and Athlon 300U, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
