Ryzen 9 3900XT vs Pentium D 840
Primary details
Comparing Pentium D 840 and Ryzen 9 3900XT processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | 268 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 25.00 |
| Market segment | Desktop processor | Desktop processor |
| Series | no data | AMD Ryzen 9 |
| Power efficiency | no data | 18.53 |
| Architecture codename | Smithfield (2005) | Matisse 2 (2020) |
| Release date | May 2005 (19 years ago) | 7 July 2020 (4 years ago) |
| Launch price (MSRP) | no data | $499 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Pentium D 840 and Ryzen 9 3900XT 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) | 12 (Dodeca-Core) |
| Threads | 2 | 24 |
| Base clock speed | 3.2 GHz | 3.8 GHz |
| Boost clock speed | 3.2 GHz | 4.7 GHz |
| L1 cache | 28 KB | 96K (per core) |
| L2 cache | 2 MB | 512K (per core) |
| L3 cache | 0 KB | 64 MB |
| Chip lithography | 90 nm | 7 nm, 12 nm |
| Die size | 206 mm2 | 74 mm2 |
| Maximum core temperature | 70 °C | no data |
| Maximum case temperature (TCase) | no data | 95 °C |
| Number of transistors | 169 million | 3,800 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
| Unlocked multiplier | - | + |
| VID voltage range | 1.2V-1.4V | no data |
Compatibility
Information on Pentium D 840 and Ryzen 9 3900XT 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 | PLGA775 | AM4 |
| Power consumption (TDP) | 130 Watt | 105 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium D 840 and Ryzen 9 3900XT. You'll probably need this information if you require some particular technology.
| AES-NI | - | + |
| AVX | - | + |
| 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 | 32 Bit | no data |
| FSB parity | - | no data |
| Precision Boost 2 | no data | + |
Security technologies
Pentium D 840 and Ryzen 9 3900XT 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 840 and Ryzen 9 3900XT are enumerated here.
| AMD-V | - | + |
| VT-d | - | no data |
| VT-x | - | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium D 840 and Ryzen 9 3900XT. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR4-3200 |
| Maximum memory size | no data | 128 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 51.196 GB/s |
| ECC memory support | - | + |
Peripherals
Specifications and connection of peripherals supported by Pentium D 840 and Ryzen 9 3900XT.
| PCIe version | no data | 4.0 |
Pros & cons summary
| Physical cores | 2 | 12 |
| Threads | 2 | 24 |
| Chip lithography | 90 nm | 7 nm |
| Power consumption (TDP) | 130 Watt | 105 Watt |
Ryzen 9 3900XT has 500% more physical cores and 1100% more threads, a 1185.7% more advanced lithography process, and 23.8% lower power consumption.
We couldn't decide between Pentium D 840 and Ryzen 9 3900XT. We've got no test results to judge.
Should you still have questions on choice between Pentium D 840 and Ryzen 9 3900XT, ask them in Comments section, and we shall answer.
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