Athlon X4 840 vs Pentium D 820
Aggregate performance score
Athlon X4 840 outperforms Pentium D 820 by a whopping 574% based on our aggregate benchmark results.
Primary details
Comparing Pentium D 820 and Athlon X4 840 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 3084 | 1877 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Desktop processor |
| Series | Pentium D | 4x Athlon |
| Power efficiency | 0.31 | 3.04 |
| Architecture codename | Smithfield (2005) | Kaveri (2014−2015) |
| Release date | May 2005 (19 years ago) | August 2014 (10 years ago) |
Detailed specifications
Pentium D 820 and Athlon X4 840 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) | 4 (Quad-Core) |
| Threads | 2 | 4 |
| Base clock speed | 2.8 GHz | 3.1 GHz |
| Boost clock speed | 2.8 GHz | 3.8 GHz |
| Bus rate | 800 MHz | no data |
| L1 cache | 28 KB | 256K |
| L2 cache | 2 MB | 4 MB |
| L3 cache | 0 KB | no data |
| Chip lithography | 90 nm | 28 nm |
| Die size | 206 mm2 | 245 mm2 |
| Maximum core temperature | 64 °C | no data |
| Maximum case temperature (TCase) | no data | 72 °C |
| Number of transistors | 169 million | 2,411 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | - | + |
| VID voltage range | 1.2V-1.4V | no data |
Compatibility
Information on Pentium D 820 and Athlon X4 840 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 | 2 | 1 |
| Socket | PLGA775 | Socket FM2+ |
| Power consumption (TDP) | 95 Watt | 65 watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium D 820 and Athlon X4 840. You'll probably need this information if you require some particular technology.
| AES-NI | - | + |
| FMA | - | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | - | no data |
| Turbo Boost Technology | - | no data |
| Hyper-Threading Technology | - | no data |
| Idle States | + | no data |
| Demand Based Switching | - | no data |
| PAE | 32 Bit | no data |
| FSB parity | - | no data |
Security technologies
Pentium D 820 and Athlon X4 840 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 Pentium D 820 and Athlon X4 840 are enumerated here.
| AMD-V | - | + |
| VT-d | - | no data |
| VT-x | - | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium D 820 and Athlon X4 840. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR3 |
Peripherals
Specifications and connection of peripherals supported by Pentium D 820 and Athlon X4 840.
| PCIe version | no data | 3.0 |
| PCI Express lanes | no data | 16 |
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.
Pros & cons summary
| Performance score | 0.31 | 2.09 |
| Physical cores | 2 | 4 |
| Threads | 2 | 4 |
| Chip lithography | 90 nm | 28 nm |
| Power consumption (TDP) | 95 Watt | 65 Watt |
Athlon X4 840 has a 574.2% higher aggregate performance score, 100% more physical cores and 100% more threads, a 221.4% more advanced lithography process, and 46.2% lower power consumption.
The Athlon X4 840 is our recommended choice as it beats the Pentium D 820 in performance tests.
Should you still have questions on choice between Pentium D 820 and Athlon X4 840, 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.
