Athlon II X4 635 vs Phenom II X4 820
Aggregate performance score
Athlon II X4 635 outperforms Phenom II X4 820 by a small 8% based on our aggregate benchmark results.
Primary details
Comparing Phenom II X4 820 and Athlon II X4 635 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2274 | 2222 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 2.10 | 2.86 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 1.30 | 1.40 |
| Architecture codename | Deneb (2009−2011) | Propus (2009−2011) |
| Release date | 1 September 2009 (15 years ago) | 25 January 2010 (14 years ago) |
| Launch price (MSRP) | $90 | $70 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Athlon II X4 635 has 36% better value for money than Phenom II X4 820.
Detailed specifications
Phenom II X4 820 and Athlon II X4 635 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) | 4 (Quad-Core) |
| Threads | 4 | 4 |
| Base clock speed | 2.8 GHz | 2.9 GHz |
| Boost clock speed | 2.8 GHz | 2.9 GHz |
| L1 cache | 128 KB (per core) | 128 KB (per core) |
| L2 cache | 512 KB (per core) | 512 KB (per core) |
| L3 cache | 4 MB (shared) | 0 KB |
| Chip lithography | 45 nm | 45 nm |
| Die size | 258 mm2 | 169 mm2 |
| Number of transistors | 758 million | 300 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Phenom II X4 820 and Athlon II X4 635 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 |
| Socket | AM3 | AM3 |
| Power consumption (TDP) | 95 Watt | 95 Watt |
Virtualization technologies
Virtual machine speed-up technologies supported by Phenom II X4 820 and Athlon II X4 635 are enumerated here.
| AMD-V | + | - |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Phenom II X4 820 and Athlon II X4 635. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR3 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | no data |
Peripherals
Specifications and connection of peripherals supported by Phenom II X4 820 and Athlon II X4 635.
| PCIe version | 2.0 | 2.0 |
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.
GeekBench 5 Single-Core
GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.
GeekBench 5 Multi-Core
GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.
Pros & cons summary
| Performance score | 1.31 | 1.41 |
| Recency | 1 September 2009 | 25 January 2010 |
Athlon II X4 635 has a 7.6% higher aggregate performance score, and an age advantage of 4 months.
Given the minimal performance differences, no clear winner can be declared between Phenom II X4 820 and Athlon II X4 635.
Should you still have questions on choice between Phenom II X4 820 and Athlon II X4 635, ask them in Comments section, and we shall answer.
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