Celeron B840 vs Athlon II X4 651
Aggregate performance score
Athlon II X4 651 outperforms Celeron B840 by a whopping 270% based on our aggregate benchmark results.
Primary details
Comparing Athlon II X4 651 and Celeron B840 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1831 | 2802 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | no data | Intel Celeron |
| Power efficiency | 2.14 | 1.65 |
| Architecture codename | Llano (2011−2012) | Sandy Bridge (2011−2013) |
| Release date | 14 November 2011 (13 years ago) | 1 July 2011 (13 years ago) |
| Launch price (MSRP) | no data | $86 |
Detailed specifications
Athlon II X4 651 and Celeron B840 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 GHz | no data |
| Boost clock speed | 3 GHz | 1.9 GHz |
| Bus type | no data | DMI 2.0 |
| Bus rate | no data | 4 × 5 GT/s |
| Multiplier | no data | 19 |
| L1 cache | 128 KB (per core) | 64K (per core) |
| L2 cache | 1 MB (per core) | 256K (per core) |
| L3 cache | 0 KB | 2 MB (shared) |
| Chip lithography | 32 nm | 32 nm |
| Die size | 228 mm2 | 131 mm2 |
| Maximum core temperature | no data | 100 °C |
| Number of transistors | 1,178 million | 504 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Athlon II X4 651 and Celeron B840 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 (Uniprocessor) |
| Socket | FM1 | G2 (988B) |
| Power consumption (TDP) | 100 Watt | 35 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Athlon II X4 651 and Celeron B840. You'll probably need this information if you require some particular technology.
| FMA | - | + |
| Enhanced SpeedStep (EIST) | no data | + |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
Security technologies
Athlon II X4 651 and Celeron B840 technologies aimed at improving security, for example, by protecting against hacks.
| EDB | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Athlon II X4 651 and Celeron B840 are enumerated here.
| AMD-V | + | - |
| VT-x | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon II X4 651 and Celeron B840. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR3 |
| Maximum memory size | no data | 16 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 21.335 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | Intel HD Graphics (Sandy Bridge) (650 - 950 MHz) |
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 | 2.26 | 0.61 |
| Recency | 14 November 2011 | 1 July 2011 |
| Physical cores | 4 | 2 |
| Threads | 4 | 2 |
| Power consumption (TDP) | 100 Watt | 35 Watt |
Athlon II X4 651 has a 270.5% higher aggregate performance score, an age advantage of 4 months, and 100% more physical cores and 100% more threads.
Celeron B840, on the other hand, has 185.7% lower power consumption.
The Athlon II X4 651 is our recommended choice as it beats the Celeron B840 in performance tests.
Note that Athlon II X4 651 is a desktop processor while Celeron B840 is a notebook one.
Should you still have questions on choice between Athlon II X4 651 and Celeron B840, ask them in Comments section, and we shall answer.
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