Atom N455 vs Pentium G840
Primary details
Comparing Pentium G840 and Atom N455 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2604 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 4.61 | no data |
| Market segment | Desktop processor | Laptop |
| Series | no data | Intel Atom |
| Power efficiency | 1.16 | no data |
| Architecture codename | Sandy Bridge (2011−2013) | Pinetrail (2009−2011) |
| Release date | 22 May 2011 (13 years ago) | 1 June 2010 (14 years ago) |
| Launch price (MSRP) | $60 | $64 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Pentium G840 and Atom N455 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 | 2 (Dual-core) | 1 (Single-Core) |
| Threads | 2 | 2 |
| Base clock speed | 2.8 GHz | 1.66 GHz |
| Boost clock speed | 2.8 GHz | 1.67 GHz |
| Bus rate | no data | 533 MHz |
| L1 cache | 64 KB (per core) | 64 KB (per core) |
| L2 cache | 256 KB (per core) | 512K (per core) |
| L3 cache | 3 MB (shared) | 0 KB |
| Chip lithography | 32 nm | 45 nm |
| Die size | 131 mm2 | 66 mm2 |
| Maximum core temperature | 69 °C | 100 °C |
| Number of transistors | 504 million | 123 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Pentium G840 and Atom N455 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 | FCLGA1155 | FCBGA559 |
| Power consumption (TDP) | 65 Watt | 6.5 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium G840 and Atom N455. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.1, Intel® SSE4.2 | Intel® SSE2, Intel® SSE3, Intel® SSSE3 |
| AES-NI | + | - |
| AVX | + | - |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | - | - |
| Hyper-Threading Technology | - | + |
| Idle States | + | no data |
| Thermal Monitoring | + | + |
| Flex Memory Access | + | no data |
| Demand Based Switching | no data | - |
| FDI | + | no data |
| Fast Memory Access | + | no data |
Security technologies
Pentium G840 and Atom N455 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | - |
| EDB | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Pentium G840 and Atom N455 are enumerated here.
| VT-d | - | - |
| VT-x | + | - |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium G840 and Atom N455. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR3 |
| Maximum memory size | 32 GB | 2 GB |
| Max memory channels | 2 | 1 |
| Maximum memory bandwidth | 21 GB/s | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Intel® HD Graphics for 2nd Generation Intel® Processors | Intel GMA 3150 |
| Graphics max frequency | 1.1 GHz | no data |
Graphics interfaces
Available interfaces and connections of Pentium G840 and Atom N455 integrated GPUs.
| Number of displays supported | 2 | no data |
Peripherals
Specifications and connection of peripherals supported by Pentium G840 and Atom N455.
| PCIe version | 2.0 | no data |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
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
| Recency | 22 May 2011 | 1 June 2010 |
| Physical cores | 2 | 1 |
| Chip lithography | 32 nm | 45 nm |
| Power consumption (TDP) | 65 Watt | 6 Watt |
Pentium G840 has an age advantage of 11 months, 100% more physical cores, and a 40.6% more advanced lithography process.
Atom N455, on the other hand, has 983.3% lower power consumption.
We couldn't decide between Pentium G840 and Atom N455. We've got no test results to judge.
Note that Pentium G840 is a desktop processor while Atom N455 is a notebook one.
Should you still have questions on choice between Pentium G840 and Atom N455, ask them in Comments section, and we shall answer.
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