Pentium G840 vs Phenom II X3 P820
Aggregate performance score
Pentium G840 outperforms Phenom II X3 P820 by a moderate 19% based on our aggregate benchmark results.
Primary details
Comparing Phenom II X3 P820 and Pentium G840 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2721 | 2595 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 4.61 |
| Market segment | Laptop | Desktop processor |
| Series | 3x AMD Phenom II | no data |
| Power efficiency | 2.52 | 1.15 |
| Architecture codename | Champlain (2010−2011) | Sandy Bridge (2011−2013) |
| Release date | 12 May 2010 (14 years ago) | 22 May 2011 (13 years ago) |
| Launch price (MSRP) | no data | $60 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Phenom II X3 P820 and Pentium G840 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 | 3 (Tri-Core) | 2 (Dual-core) |
| Threads | 3 | 2 |
| Base clock speed | no data | 2.8 GHz |
| Boost clock speed | 1.8 GHz | 2.8 GHz |
| Bus rate | 3600 MHz | no data |
| L1 cache | 384 KB | 64 KB (per core) |
| L2 cache | 1.5 MB | 256 KB (per core) |
| L3 cache | no data | 3 MB (shared) |
| Chip lithography | 45 nm | 32 nm |
| Die size | no data | 131 mm2 |
| Maximum core temperature | no data | 69 °C |
| Number of transistors | no data | 504 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Phenom II X3 P820 and Pentium G840 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 | no data | 1 |
| Socket | S1 | FCLGA1155 |
| Power consumption (TDP) | 25 Watt | 65 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Phenom II X3 P820 and Pentium G840. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Virtualization, AMD64, Advanced Virus Protection, SSE(1,2,3,4a) | Intel® SSE4.1, Intel® SSE4.2 |
| AES-NI | - | + |
| AVX | - | + |
| VirusProtect | + | - |
| Enhanced SpeedStep (EIST) | no data | + |
| Turbo Boost Technology | no data | - |
| Hyper-Threading Technology | no data | - |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | + |
| FDI | no data | + |
| Fast Memory Access | no data | + |
Security technologies
Phenom II X3 P820 and Pentium G840 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | - |
| EDB | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Phenom II X3 P820 and Pentium G840 are enumerated here.
| AMD-V | + | - |
| VT-d | no data | - |
| VT-x | no data | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Phenom II X3 P820 and Pentium G840. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR3 |
| Maximum memory size | no data | 32 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 21 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | Intel® HD Graphics for 2nd Generation Intel® Processors |
| Graphics max frequency | no data | 1.1 GHz |
Graphics interfaces
Available interfaces and connections of Phenom II X3 P820 and Pentium G840 integrated GPUs.
| Number of displays supported | no data | 2 |
Peripherals
Specifications and connection of peripherals supported by Phenom II X3 P820 and Pentium G840.
| PCIe version | no data | 2.0 |
Pros & cons summary
| Performance score | 0.69 | 0.82 |
| Recency | 12 May 2010 | 22 May 2011 |
| Physical cores | 3 | 2 |
| Threads | 3 | 2 |
| Chip lithography | 45 nm | 32 nm |
| Power consumption (TDP) | 25 Watt | 65 Watt |
Phenom II X3 P820 has 50% more physical cores and 50% more threads, and 160% lower power consumption.
Pentium G840, on the other hand, has a 18.8% higher aggregate performance score, an age advantage of 1 year, and a 40.6% more advanced lithography process.
The Pentium G840 is our recommended choice as it beats the Phenom II X3 P820 in performance tests.
Be aware that Phenom II X3 P820 is a notebook processor while Pentium G840 is a desktop one.
Should you still have questions on choice between Phenom II X3 P820 and Pentium G840, ask them in Comments section, and we shall answer.
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