Pentium D 940 vs Athlon 64 FX-55
Primary details
Comparing Athlon 64 FX-55 and Pentium D 940 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 | Clawhammer (2001−2005) | Presler (2005−2007) |
| Release date | 10 October 2004 (20 years ago) | 5 January 2006 (18 years ago) |
| Launch price (MSRP) | $180 | $423 |
Detailed specifications
Athlon 64 FX-55 and Pentium D 940 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 | 1 (Single-Core) | 2 (Dual-core) |
| Threads | 1 | 2 |
| Base clock speed | 2.6 GHz | 3.2 GHz |
| Boost clock speed | 2.6 GHz | 3.2 GHz |
| L1 cache | 128 KB | 16 KB (per core) |
| L2 cache | 1 MB | 2 MB (per die) |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 130 nm | 65 nm |
| Die size | 193 mm2 | 2x 81 mm2 |
| Maximum case temperature (TCase) | 63 °C | 69 °C |
| Number of transistors | 105 million | 376 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | + | - |
| VID voltage range | no data | 1.2V-1.3375V |
Compatibility
Information on Athlon 64 FX-55 and Pentium D 940 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 | 939 | LGA775,PLGA775 |
| Power consumption (TDP) | 104 Watt | 130 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Athlon 64 FX-55 and Pentium D 940. You'll probably need this information if you require some particular technology.
| 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 | no data | 32 Bit |
| FSB parity | no data | - |
Security technologies
Athlon 64 FX-55 and Pentium D 940 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 Athlon 64 FX-55 and Pentium D 940 are enumerated here.
| VT-d | no data | - |
| VT-x | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon 64 FX-55 and Pentium D 940. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1 Depends on motherboard | DDR1, DDR2, DDR3 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | On certain motherboards (Chipset feature) |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
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
| Recency | 10 October 2004 | 5 January 2006 |
| Physical cores | 1 | 2 |
| Threads | 1 | 2 |
| Chip lithography | 130 nm | 65 nm |
| Power consumption (TDP) | 104 Watt | 130 Watt |
Athlon 64 FX-55 has 25% lower power consumption.
Pentium D 940, on the other hand, has an age advantage of 1 year, 100% more physical cores and 100% more threads, and a 100% more advanced lithography process.
We couldn't decide between Athlon 64 FX-55 and Pentium D 940. We've got no test results to judge.
Should you still have questions on choice between Athlon 64 FX-55 and Pentium D 940, ask them in Comments section, and we shall answer.
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