Xeon 6516P-B vs Atom C3958
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1921 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 0.27 | no data |
| Market segment | Server | Server |
| Series | Intel Atom | no data |
| Power efficiency | 3.04 | no data |
| Designer | Intel | Intel |
| Manufacturer | no data | Intel |
| Architecture codename | Goldmont (2016−2017) | Granite Rapids (2024−2025) |
| Release date | 15 August 2017 (7 years ago) | 24 February 2025 (less than a year ago) |
| Launch price (MSRP) | $449 | $1,544 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Detailed specifications
Atom C3958 and Xeon 6516P-B 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) | 20 (Icosa-Core) |
| Performance-cores | no data | 20 |
| Threads | 16 | 40 |
| Base clock speed | 2 GHz | 2.3 GHz |
| Boost clock speed | 2 GHz | 3.5 GHz |
| Multiplier | 20 | no data |
| L1 cache | 896 KB | 112 KB (per core) |
| L2 cache | 16 MB | 2 MB (per core) |
| L3 cache | 16 MB | 80 MB (shared) |
| Chip lithography | 14 nm | Intel 3 nm |
| Die size | no data | 598 mm2 |
| Maximum core temperature | 83 °C | no data |
| Maximum case temperature (TCase) | no data | 85 °C |
| 64 bit support | + | + |
| Windows 11 compatibility | - | no data |
Compatibility
Information on Atom C3958 and Xeon 6516P-B 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) | 2 |
| Socket | FCBGA1310 | FCBGA4368 |
| Power consumption (TDP) | 31 Watt | 145 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Atom C3958 and Xeon 6516P-B. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® AMX, Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512 |
| AES-NI | + | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | + | - |
| QuickAssist | + | + |
| Speed Shift | no data | - |
| Turbo Boost Technology | - | 2.0 |
| Hyper-Threading Technology | - | + |
| TSX | - | + |
| Deep Learning Boost | - | + |
Security technologies
Atom C3958 and Xeon 6516P-B technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
| EDB | + | + |
| Secure Boot | + | no data |
| Secure Key | + | no data |
| SGX | - | Yes with Intel® SPS |
| OS Guard | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Atom C3958 and Xeon 6516P-B are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Atom C3958 and Xeon 6516P-B. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4: 2400 | DDR5 |
| Maximum memory size | 256 GB | 1.13 TB |
| Max memory channels | 2 | 4 |
| Maximum memory bandwidth | 38.397 GB/s | no data |
| ECC memory support | + | + |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | N/A |
Peripherals
Specifications and connection of peripherals supported by Atom C3958 and Xeon 6516P-B.
| PCIe version | 3 | 5.0 |
| PCI Express lanes | 16 | 48 |
| PCI support | no data | Gen 4, Gen 5 |
| USB revision | 3 | no data |
| Total number of SATA ports | 16 | no data |
| Number of USB ports | 8 | no data |
| Integrated LAN | 4x10/2.5/1 GBE | + |
Pros & cons summary
| Recency | 15 August 2017 | 24 February 2025 |
| Physical cores | 16 | 20 |
| Threads | 16 | 40 |
| Power consumption (TDP) | 31 Watt | 145 Watt |
Atom C3958 has 367.7% lower power consumption.
Xeon 6516P-B, on the other hand, has an age advantage of 7 years, and 25% more physical cores and 150% more threads.
We couldn't decide between Intel Atom C3958 and Intel Xeon 6516P-B. We've got no test results to judge.
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