Atom C3955 vs Xeon 658X
Aggregate performance score
Xeon 658X outperforms Atom C3955 by a whopping 1077% based on our aggregate benchmark results.
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 99 | 1774 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 25.47 | 0.38 |
| Market segment | Server | Server |
| Series | no data | Intel Atom |
| Power efficiency | 6.58 | 4.37 |
| Designer | Intel | Intel |
| Manufacturer | Intel | no data |
| Architecture codename | Granite Rapids (2024−2026) | Goldmont (2016−2017) |
| Release date | 2 February 2026 (recently) | 15 August 2017 (8 years ago) |
| Launch price (MSRP) | $1,699 | $434 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Xeon 658X has 6603% better value for money than Atom C3955.
Performance to price scatter graph
Detailed specifications
Xeon 658X and Atom C3955 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 | 24 (Tetracosa-Core) | 16 (Hexadeca-Core) |
| Performance-cores | 24 | no data |
| Threads | 48 | 16 |
| Base clock speed | 3 GHz | 2.1 GHz |
| Boost clock speed | 4.9 GHz | 2.4 GHz |
| Bus rate | 0 GT/s | no data |
| Multiplier | no data | 21 |
| L1 cache | 112 KB (per core) | 896 KB |
| L2 cache | 2 MB (per core) | 16 MB |
| L3 cache | 144 MB (shared) | 16 MB |
| Chip lithography | Intel 3 nm | 14 nm |
| Die size | 2x 598 mm2 | no data |
| Maximum core temperature | no data | 78 °C |
| Maximum case temperature (TCase) | 75 °C | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | no data | - |
| Unlocked multiplier | + | - |
Compatibility
Information on Xeon 658X and Atom C3955 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 (Uniprocessor) |
| Socket | FCLGA4710 | FCBGA1310 |
| Power consumption (TDP) | 250 Watt | 32 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon 658X and Atom C3955. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.1, Intel® AMX, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512 | no data |
| AES-NI | + | + |
| AVX | + | - |
| vPro | + | no data |
| Enhanced SpeedStep (EIST) | + | + |
| QuickAssist | no data | - |
| Speed Shift | + | no data |
| Turbo Boost Technology | 2.0 | 2.0 |
| Hyper-Threading Technology | + | - |
| TSX | + | - |
| Turbo Boost Max 3.0 | + | no data |
| Deep Learning Boost | + | - |
Security technologies
Xeon 658X and Atom C3955 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | no data |
| EDB | + | + |
| Secure Boot | no data | + |
| SGX | - | - |
| OS Guard | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon 658X and Atom C3955 are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon 658X and Atom C3955. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR5(6400MT/s) | DDR4: 2400 |
| Maximum memory size | 4 TB | 256 GB |
| Max memory channels | 8 | 2 |
| Maximum memory bandwidth | no data | 38.397 GB/s |
| ECC memory support | + | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | N/A | no data |
Peripherals
Specifications and connection of peripherals supported by Xeon 658X and Atom C3955.
| PCIe version | 5.0 | 3 |
| PCI Express lanes | 128 | 16 |
| USB revision | no data | 3 |
| Total number of SATA ports | no data | 16 |
| Number of USB ports | no data | 8 |
| Integrated LAN | no data | 4x10/2.5/1 GBE |
Synthetic benchmarks
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.
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. Other than that, Passmark measures multi-core performance.
Pros & cons summary
| Performance score | 38.95 | 3.31 |
| Recency | 2 February 2026 | 15 August 2017 |
| Physical cores | 24 | 16 |
| Threads | 48 | 16 |
| Power consumption (TDP) | 250 Watt | 32 Watt |
Xeon 658X has a 1076.7% higher aggregate performance score, an age advantage of 8 years, and 50% more physical cores and 200% more threads.
Atom C3955, on the other hand, has 681.3% lower power consumption.
The Intel Xeon 658X is our recommended choice as it beats the Intel Atom C3955 in performance tests.
Other comparisons
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