Sempron X2 2100 vs Athlon II X4 645
Primary details
Comparing Athlon II X4 645 and Sempron X2 2100 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in performance ranking | 2053 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 3.30 | no data |
| Market segment | Desktop processor | Desktop processor |
| Architecture codename | Propus (2009−2011) | Brisbane (2001−2008) |
| Release date | 21 September 2010 (13 years ago) | March 2008 (16 years ago) |
| Launch price (MSRP) | $80 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Athlon II X4 645 and Sempron X2 2100 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 | 2 |
| Base clock speed | 3.1 GHz | no data |
| Boost clock speed | 3.1 GHz | 1.8 GHz |
| L1 cache | 128 KB (per core) | 128 KB |
| L2 cache | 512 KB (per core) | 256 KB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 45 nm | 65 nm |
| Die size | 169 mm2 | 118 mm2 |
| Number of transistors | 300 million | 221 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | No | No |
Compatibility
Information on Athlon II X4 645 and Sempron X2 2100 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 | 2 |
| Socket | AM3 | AM2 |
| Power consumption (TDP) | 95 Watt | 65 Watt |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon II X4 645 and Sempron X2 2100. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | no data |
Peripherals
Specifications and connection of peripherals supported by Athlon II X4 645 and Sempron X2 2100.
| PCIe version | 2.0 | no data |
Pros & cons summary
| Physical cores | 4 | 2 |
| Threads | 4 | 2 |
| Chip lithography | 45 nm | 65 nm |
| Power consumption (TDP) | 95 Watt | 65 Watt |
Athlon II X4 645 has 100% more physical cores and 100% more threads, and a 44.4% more advanced lithography process.
Sempron X2 2100, on the other hand, has 46.2% lower power consumption.
We couldn't decide between Athlon II X4 645 and Sempron X2 2100. We've got no test results to judge.
Should you still have questions on choice between Athlon II X4 645 and Sempron X2 2100, ask them in Comments section, and we shall answer.
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