Athlon II X4 640 vs Athlon II X4 651K
Primary details
Comparing Athlon II X4 651K and Athlon II X4 640 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | 2199 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 2.92 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | no data | 1.40 |
| Architecture codename | Llano (2011−2012) | Propus (2009−2011) |
| Release date | 14 November 2011 (13 years ago) | 11 May 2010 (14 years ago) |
| Launch price (MSRP) | no data | $80 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Athlon II X4 651K and Athlon II X4 640 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 | 3 GHz | 3 GHz |
| Boost clock speed | 3 GHz | 3 GHz |
| L1 cache | 128 KB (per core) | 128 KB (per core) |
| L2 cache | 1 MB (per core) | 512 KB (per core) |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 32 nm | 45 nm |
| Die size | 228 mm2 | 169 mm2 |
| Number of transistors | 1,178 million | 300 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Athlon II X4 651K and Athlon II X4 640 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 | FM1 | AM3 |
| Power consumption (TDP) | 100 Watt | 95 Watt |
Virtualization technologies
Virtual machine speed-up technologies supported by Athlon II X4 651K and Athlon II X4 640 are enumerated here.
| AMD-V | + | - |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon II X4 651K and Athlon II X4 640. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR3 |
Peripherals
Specifications and connection of peripherals supported by Athlon II X4 651K and Athlon II X4 640.
| PCIe version | no data | 2.0 |
Pros & cons summary
| Recency | 14 November 2011 | 11 May 2010 |
| Chip lithography | 32 nm | 45 nm |
| Power consumption (TDP) | 100 Watt | 95 Watt |
Athlon II X4 651K has an age advantage of 1 year, and a 40.6% more advanced lithography process.
Athlon II X4 640, on the other hand, has 5.3% lower power consumption.
We couldn't decide between Athlon II X4 651K and Athlon II X4 640. We've got no test results to judge.
Should you still have questions on choice between Athlon II X4 651K and Athlon II X4 640, 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.
