Celeron B815 vs Pentium D 945
Primary details
Comparing Pentium D 945 and Celeron B815 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 | Presler (2005−2007) | Sandy Bridge (2011−2013) |
| Release date | 23 July 2006 (18 years ago) | 1 January 2012 (12 years ago) |
| Launch price (MSRP) | $163 | $86 |
Detailed specifications
Pentium D 945 and Celeron B815 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) | 2 (Dual-core) |
| Threads | 2 | 2 |
| Base clock speed | 3.4 GHz | 1.6 GHz |
| Boost clock speed | 3.4 GHz | 1.6 GHz |
| Bus type | no data | DMI 2.0 |
| Bus rate | no data | 4 × 5 GT/s |
| Multiplier | no data | 16 |
| L1 cache | 16 KB (per core) | 64K (per core) |
| L2 cache | 2 MB (per die) | 256K (per core) |
| L3 cache | 0 KB | 2 MB (shared) |
| Chip lithography | 65 nm | 32 nm |
| Die size | 2x 81 mm2 | 131 mm2 |
| Maximum core temperature | no data | 100 °C |
| Maximum case temperature (TCase) | 63 °C | no data |
| Number of transistors | 376 million | 504 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | 1.2V-1.3375V | no data |
Compatibility
Information on Pentium D 945 and Celeron B815 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 | LGA775,PLGA775 | FCPGA988,PGA988 |
| Power consumption (TDP) | 95 Watt | 35 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium D 945 and Celeron B815. 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 945 and Celeron B815 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 945 and Celeron B815 are enumerated here.
| VT-d | - | - |
| VT-x | - | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium D 945 and Celeron B815. 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 | On certain motherboards (Chipset feature) | Intel® HD Graphics for 2nd Generation Intel® Processors |
| Graphics max frequency | no data | 1.05 GHz |
Graphics interfaces
Available interfaces and connections of Pentium D 945 and Celeron B815 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 945 and Celeron B815.
| PCIe version | no data | 2.0 |
| PCI Express lanes | no data | 16 |
Pros & cons summary
| Recency | 23 July 2006 | 1 January 2012 |
| Chip lithography | 65 nm | 32 nm |
| Power consumption (TDP) | 95 Watt | 35 Watt |
Celeron B815 has an age advantage of 5 years, a 103.1% more advanced lithography process, and 171.4% lower power consumption.
We couldn't decide between Pentium D 945 and Celeron B815. We've got no test results to judge.
Note that Pentium D 945 is a desktop processor while Celeron B815 is a notebook one.
Should you still have questions on choice between Pentium D 945 and Celeron B815, ask them in Comments section, and we shall answer.
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