Pentium 4 HT 661 vs Pentium D 945
Primary details
Comparing Pentium D 945 and Pentium 4 HT 661 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 | Desktop processor |
| Architecture codename | Presler (2005−2007) | Cedar Mill (2006) |
| Release date | 23 July 2006 (18 years ago) | 5 January 2006 (18 years ago) |
| Launch price (MSRP) | $163 | $401 |
Detailed specifications
Pentium D 945 and Pentium 4 HT 661 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 | 2 |
| Base clock speed | 3.4 GHz | 3.6 GHz |
| Boost clock speed | 3.4 GHz | 3.6 GHz |
| L1 cache | 16 KB (per core) | 28 KB |
| L2 cache | 2 MB (per die) | 2 MB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 65 nm | 65 nm |
| Die size | 2x 81 mm2 | 81 mm2 |
| Maximum case temperature (TCase) | 63 °C | 69 °C |
| Number of transistors | 376 million | 188 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | 1.2V-1.3375V | no data |
Compatibility
Information on Pentium D 945 and Pentium 4 HT 661 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 |
| Socket | LGA775,PLGA775 | 775 |
| Power consumption (TDP) | 95 Watt | 86 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium D 945 and Pentium 4 HT 661. You'll probably need this information if you require some particular technology.
| Enhanced SpeedStep (EIST) | + | + |
| 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 945 and Pentium 4 HT 661 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 945 and Pentium 4 HT 661 are enumerated here.
| VT-d | - | no data |
| VT-x | - | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium D 945 and Pentium 4 HT 661. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR1, DDR2, DDR3 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | no data |
Pros & cons summary
| Recency | 23 July 2006 | 5 January 2006 |
| Physical cores | 2 | 1 |
| Power consumption (TDP) | 95 Watt | 86 Watt |
Pentium D 945 has an age advantage of 6 months, and 100% more physical cores.
Pentium 4 HT 661, on the other hand, has 10.5% lower power consumption.
We couldn't decide between Pentium D 945 and Pentium 4 HT 661. We've got no test results to judge.
Should you still have questions on choice between Pentium D 945 and Pentium 4 HT 661, ask them in Comments section, and we shall answer.
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