Athlon II X4 638: specs and benchmarks
Aggregate performance score
Athlon II X4 638 provides poor benchmark performance at 1.42% of a leader's which is a 96-core EPYC 9655P.
Summary
AMD started Athlon II X4 638 sales 6 February 2012. This is a Llano architecture desktop processor primarily aimed at office systems. It has 4 cores and 4 threads, and is based on 32 nm manufacturing technology, with a maximum frequency of 2.7 and a locked multiplier.
Compatibility-wise, this is AMD Socket FM1 processor with a TDP of 65 Watt. It supports DDR3 memory.
Primary details
Athlon II X4 638 processor market type (desktop or notebook), architecture, sales start time and pricing.
| Place in the ranking | 2191 | |
| Place by popularity | not in top-100 | |
| Market segment | Desktop processor | |
| Power efficiency | 2.07 | of 100.00 (Core Ultra 7 164U) |
| Architecture codename | Llano (2011−2012) | |
| Release date | 6 February 2012 (12 years ago) |
Detailed specifications
Basic microprocessor parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters can generally indicate CPU performance, but to be more precise you have to review its test results.
| Physical cores | 4 (Quad-Core) | |
| Threads | 4 | |
| Base clock speed | 2.7 GHz | of 4.7 GHz (Ryzen 9 7900X) |
| Boost clock speed | 2.7 GHz | of 6.2 GHz (Core i9-14900KS) |
| L1 cache | 128 KB (per core) | of 80 KB (EPYC 9965) |
| L2 cache | 1 MB (per core) | of 2 MB (Xeon 6980P) |
| L3 cache | 0 KB | of 1152 MB (EPYC 9684X) |
| Chip lithography | 32 nm | of 3 nm (Core Ultra 9 285K) |
| Die size | 228 mm2 | |
| Number of transistors | 1,178 million | of 135,240 million (EPYC 9684X) |
| 64 bit support | + | |
| Windows 11 compatibility | - |
Compatibility
Information on Athlon II X4 638 compatibility with other computer components and devices: 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 | of 8 (Xeon Platinum 8454H) |
| Socket | FM1 | |
| Power consumption (TDP) | 65 Watt | of 3100 ‑ 4500 (Ryzen 7 7435H) |
Virtualization technologies
Supported virtual machine optimization technologies. Some are specific to Intel only, some to AMD.
| AMD-V | + |
Memory specs
Types, maximum amount and channel number of RAM supported by Athlon II X4 638's memory controller. Depending on the motherboard, higher memory frequency may be supported.
| Supported memory types | DDR3 |
Benchmark performance
Single-core and multi-core benchmark results of Athlon II X4 638. Overall benchmark performance 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.
Send your test results of Athlon II X4 638.
Intel equivalent
According to our data, the closest Intel alternative to Athlon II X4 638 is Core i5-650, which is nearly equal in speed and lower by 1 position in our ranking.
Here are some closest Intel rivals to Athlon II X4 638:
Similar processors
Here is our recommendation of several processors that are more or less close in performance to the one reviewed.
Recommended GPUs
People consider these graphics cards to be good for Athlon II X4 638, according to our PC configuration statistics.
These are the fastest graphics cards for Athlon II X4 638 in our user configuration statistics. There is a total of 93 configurations using Athlon II X4 638 in our database.
