Athlon X4 840 vs Athlon 300U
Aggregate performance score
Athlon 300U outperforms Athlon X4 840 by a moderate 17% based on our aggregate benchmark results.
Primary details
Comparing Athlon 300U and Athlon X4 840 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1754 | 1871 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Desktop processor |
| Series | AMD Athlon | 4x Athlon |
| Power efficiency | 15.38 | 3.04 |
| Architecture codename | Raven Ridge 2 (2019) | Kaveri (2014−2015) |
| Release date | 6 January 2019 (5 years ago) | August 2014 (10 years ago) |
Detailed specifications
Athlon 300U and Athlon X4 840 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 | 2 (Dual-core) | 4 (Quad-Core) |
| Threads | 4 | 4 |
| Base clock speed | 2.4 GHz | 3.1 GHz |
| Boost clock speed | 3.3 GHz | 3.8 GHz |
| Bus type | PCIe 3.0 | no data |
| Multiplier | 24 | no data |
| L1 cache | 192 KB | 256K |
| L2 cache | 1 MB | 4 MB |
| L3 cache | 4 MB (shared) | no data |
| Chip lithography | 14 nm | 28 nm |
| Die size | 209.78 mm2 | 245 mm2 |
| Maximum case temperature (TCase) | no data | 72 °C |
| Number of transistors | 4940 Million | 2,411 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | - |
| Unlocked multiplier | - | + |
Compatibility
Information on Athlon 300U and Athlon X4 840 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 (Uniprocessor) | 1 |
| Socket | FP5 | Socket FM2+ |
| Power consumption (TDP) | 15 Watt | 65 watt |
Technologies and extensions
Technological solutions and additional instructions supported by Athlon 300U and Athlon X4 840. You'll probably need this information if you require some particular technology.
| Instruction set extensions | XFR, FMA3, SSE 4.2, AVX2, SMT | no data |
| AES-NI | + | + |
| FMA | - | + |
| AVX | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Athlon 300U and Athlon X4 840 are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon 300U and Athlon X4 840. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4 Dual-channel | DDR3 |
| Maximum memory size | 64 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 38.397 GB/s | no data |
| ECC memory support | + | - |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | AMD Radeon RX Vega 3 | no data |
Peripherals
Specifications and connection of peripherals supported by Athlon 300U and Athlon X4 840.
| PCIe version | 3.0 | 3.0 |
| PCI Express lanes | 12 | 16 |
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 | 2.53 | 2.17 |
| Recency | 6 January 2019 | on August 2014 |
| Physical cores | 2 | 4 |
| Chip lithography | 14 nm | 28 nm |
| Power consumption (TDP) | 15 Watt | 65 Watt |
Athlon 300U has a 16.6% higher aggregate performance score, an age advantage of 4 years, a 100% more advanced lithography process, and 333.3% lower power consumption.
Athlon X4 840, on the other hand, has 100% more physical cores.
The Athlon 300U is our recommended choice as it beats the Athlon X4 840 in performance tests.
Be aware that Athlon 300U is a notebook processor while Athlon X4 840 is a desktop one.
Should you still have questions on choice between Athlon 300U and Athlon X4 840, ask them in Comments section, and we shall answer.
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