Celeron 797 vs Pentium D 840
Primary details
Comparing Pentium D 840 and Celeron 797 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | no data | Intel Celeron |
| Architecture codename | Smithfield (2005) | Sandy Bridge (2011−2013) |
| Release date | May 2005 (19 years ago) | 1 January 2012 (13 years ago) |
| Launch price (MSRP) | no data | $107 |
Detailed specifications
Pentium D 840 and Celeron 797 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 | 1 |
| Base clock speed | 3.2 GHz | 1.4 GHz |
| Boost clock speed | 3.2 GHz | 1.4 GHz |
| Bus type | no data | DMI 2.0 |
| Bus rate | no data | 4 × 5 GT/s |
| Multiplier | no data | 14 |
| L1 cache | 28 KB | 64K (per core) |
| L2 cache | 2 MB | 256K (per core) |
| L3 cache | 0 KB | 1.5 MB (shared) |
| Chip lithography | 90 nm | 32 nm |
| Die size | 206 mm2 | 131 mm2 |
| Maximum core temperature | 70 °C | 100 °C |
| Number of transistors | 169 million | 504 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | 1.2V-1.4V | no data |
Compatibility
Information on Pentium D 840 and Celeron 797 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 (Uniprocessor) |
| Socket | PLGA775 | Intel BGA1023 |
| Power consumption (TDP) | 130 Watt | 17 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium D 840 and Celeron 797. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2 |
| FMA | - | + |
| Enhanced SpeedStep (EIST) | + | + |
| My WiFi | no data | - |
| Turbo Boost Technology | - | - |
| Hyper-Threading Technology | - | - |
| Idle States | + | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | + |
| Demand Based Switching | - | - |
| PAE | 32 Bit | no data |
| FDI | no data | + |
| Fast Memory Access | no data | + |
| FSB parity | - | no data |
Security technologies
Pentium D 840 and Celeron 797 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | - |
| EDB | + | + |
| Anti-Theft | no data | - |
Virtualization technologies
Virtual machine speed-up technologies supported by Pentium D 840 and Celeron 797 are enumerated here.
| VT-d | - | - |
| VT-x | - | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium D 840 and Celeron 797. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, 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 for 2nd Generation Intel Processors |
| Graphics max frequency | no data | 950 MHz |
Graphics interfaces
Available interfaces and connections of Pentium D 840 and Celeron 797 integrated GPUs.
| Number of displays supported | no data | 2 |
| eDP | no data | + |
| DisplayPort | - | + |
| HDMI | - | + |
| SDVO | no data | + |
| CRT | no data | + |
Peripherals
Specifications and connection of peripherals supported by Pentium D 840 and Celeron 797.
| PCIe version | no data | 2.0 |
| PCI Express lanes | no data | 16 |
Pros & cons summary
| Physical cores | 2 | 1 |
| Threads | 2 | 1 |
| Chip lithography | 90 nm | 32 nm |
| Power consumption (TDP) | 130 Watt | 17 Watt |
Pentium D 840 has 100% more physical cores and 100% more threads.
Celeron 797, on the other hand, has a 181.3% more advanced lithography process, and 664.7% lower power consumption.
We couldn't decide between Pentium D 840 and Celeron 797. We've got no test results to judge.
Note that Pentium D 840 is a desktop processor while Celeron 797 is a notebook one.
Other comparisons
We've compiled a selection of CPU comparisons, ranging from closely matched processors to other comparisons that may be of interest.
