Pentium D 945 vs Xeon E5-2666 V3
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1068 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Server | Desktop processor |
| Power efficiency | 6.33 | no data |
| Designer | Intel | Intel |
| Manufacturer | Intel | Intel |
| Architecture codename | Haswell-EP (2014−2015) | Presler (2005−2007) |
| Release date | 13 November 2014 (11 years ago) | 23 July 2006 (19 years ago) |
| Launch price (MSRP) | no data | $163 |
Detailed specifications
Xeon E5-2666 V3 and Pentium D 945 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 | 10 (Deca-Core) | 2 (Dual-core) |
| Threads | 20 | 2 |
| Base clock speed | 2.9 GHz | 3.4 GHz |
| Boost clock speed | 3.5 GHz | 3.4 GHz |
| L1 cache | 64K (per core) | 16 KB (per core) |
| L2 cache | 256K (per core) | 2 MB (per die) |
| L3 cache | 25 MB (shared) | 0 KB |
| Chip lithography | 22 nm | 65 nm |
| Die size | 356 mm2 | 2x 81 mm2 |
| Maximum case temperature (TCase) | no data | 63 °C |
| Number of transistors | 2,600 million | 376 million |
| 64 bit support | + | + |
| Windows 11 compatibility | no data | - |
| VID voltage range | no data | 1.2V-1.3375V |
Compatibility
Information on Xeon E5-2666 V3 and Pentium D 945 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 | 2011-3 | LGA775,PLGA775 |
| Power consumption (TDP) | 135 Watt | 95 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon E5-2666 V3 and Pentium D 945. You'll probably need this information if you require some particular technology.
| AES-NI | + | - |
| AVX | + | - |
| vPro | + | no data |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | no data | - |
| Hyper-Threading Technology | no data | - |
| TSX | + | - |
| Idle States | no data | + |
| Demand Based Switching | no data | - |
| PAE | no data | 32 Bit |
| FSB parity | no data | - |
Security technologies
Xeon E5-2666 V3 and Pentium D 945 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | - |
| EDB | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon E5-2666 V3 and Pentium D 945 are enumerated here.
| VT-d | + | - |
| VT-x | + | - |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon E5-2666 V3 and Pentium D 945. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3, DDR4 2133 MHz Quad-channel | DDR1, DDR2, DDR3 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | On certain motherboards (Chipset feature) |
Peripherals
Specifications and connection of peripherals supported by Xeon E5-2666 V3 and Pentium D 945.
| PCIe version | 3.0 | no data |
| PCI Express lanes | 40 | no data |
Pros & cons summary
| Recency | 13 November 2014 | 23 July 2006 |
| Physical cores | 10 | 2 |
| Threads | 20 | 2 |
| Chip lithography | 22 nm | 65 nm |
| Power consumption (TDP) | 135 Watt | 95 Watt |
Xeon E5-2666 V3 has an age advantage of 8 years, 400% more physical cores and 900% more threads, and a 195.5% more advanced lithography process.
Pentium D 945, on the other hand, has 42.1% lower power consumption.
We couldn't decide between Intel Xeon E5-2666 V3 and Intel Pentium D 945. We've got no test results to judge.
Be aware that Xeon E5-2666 V3 is a server/workstation processor while Pentium D 945 is a desktop one.
Other comparisons
We've compiled a selection of CPU comparisons, ranging from closely matched processors to other comparisons that may be of interest.
