Phenom II X4 840 vs Atom C3955
Aggregate performance score
Atom C3955 outperforms Phenom II X4 840 by a whopping 142% based on our aggregate benchmark results.
Primary details
Comparing Atom C3955 and Phenom II X4 840 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in performance ranking | 1453 | 2095 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 1.15 | 3.08 |
| Market segment | Server | Desktop processor |
| Series | Intel Atom | no data |
| Architecture codename | Goldmont (2016−2017) | Propus (2009−2011) |
| Release date | 15 August 2017 (7 years ago) | 4 January 2011 (13 years ago) |
| Launch price (MSRP) | $434 | $90 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Phenom II X4 840 has 168% better value for money than Atom C3955.
Detailed specifications
Atom C3955 and Phenom II X4 840 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 | 16 (Hexadeca-Core) | 4 (Quad-Core) |
| Threads | 16 | 4 |
| Base clock speed | 2.1 GHz | 3.2 GHz |
| Boost clock speed | 2.4 GHz | 3.2 GHz |
| Multiplier | 21 | no data |
| L1 cache | 896 KB | 128 KB (per core) |
| L2 cache | 16 MB | 512 KB (per core) |
| L3 cache | 16 MB | 0 KB |
| Chip lithography | 14 nm | 45 nm |
| Die size | no data | 169 mm2 |
| Maximum core temperature | 78 °C | no data |
| Number of transistors | no data | 300 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Atom C3955 and Phenom II X4 840 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 (Uniprocessor) | 1 |
| Socket | FCBGA1310 | AM3 |
| Power consumption (TDP) | 32 Watt | 95 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Atom C3955 and Phenom II X4 840. You'll probably need this information if you require some particular technology.
| AES-NI | + | - |
| Enhanced SpeedStep (EIST) | + | no data |
| QuickAssist | - | no data |
| Turbo Boost Technology | 2.0 | no data |
| Hyper-Threading Technology | - | no data |
| Status | Launched | no data |
Security technologies
Atom C3955 and Phenom II X4 840 technologies aimed at improving security, for example, by protecting against hacks.
| EDB | + | no data |
| Secure Boot | + | no data |
| Secure Key | + | no data |
| SGX | - | no data |
| OS Guard | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Atom C3955 and Phenom II X4 840 are enumerated here.
| VT-d | + | no data |
| VT-x | + | no data |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Atom C3955 and Phenom II X4 840. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4: 2400 | DDR3 |
| Maximum memory size | 256 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 38.397 GB/s | no data |
| ECC memory support | + | - |
Peripherals
Specifications and connection of peripherals supported by Atom C3955 and Phenom II X4 840.
| PCIe version | 3 | 2.0 |
| PCI Express lanes | 16 | no data |
| USB revision | 3 | no data |
| Total number of SATA ports | 16 | no data |
| Max number of SATA 6 Gb/s Ports | 16 | no data |
| Number of USB ports | 8 | no data |
| Integrated LAN | 4x10/2.5/1 GBE | no data |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
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
| Performance score | 3.75 | 1.55 |
| Recency | 15 August 2017 | 4 January 2011 |
| Physical cores | 16 | 4 |
| Threads | 16 | 4 |
| Chip lithography | 14 nm | 45 nm |
| Power consumption (TDP) | 32 Watt | 95 Watt |
Atom C3955 has a 141.9% higher aggregate performance score, an age advantage of 6 years, 300% more physical cores and 300% more threads, a 221.4% more advanced lithography process, and 196.9% lower power consumption.
The Atom C3955 is our recommended choice as it beats the Phenom II X4 840 in performance tests.
Be aware that Atom C3955 is a server/workstation processor while Phenom II X4 840 is a desktop one.
Should you still have questions on choice between Atom C3955 and Phenom II X4 840, ask them in Comments section, and we shall answer.
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