Ultra 5 250KF Plus vs Atom C3850
Contents
Primary details
Comparing 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 | Server | Desktop processor |
| Series | Intel Atom | no data |
| Designer | Intel | Intel |
| Manufacturer | no data | TSMC |
| Architecture codename | Goldmont (2016−2017) | Arrow Lake Refresh (2026) |
| Release date | 15 August 2017 (8 years ago) | 11 March 2026 (recently) |
| Launch price (MSRP) | $323 | $184 |
Detailed specifications
Atom C3850 and Core Ultra 5 250KF Plus 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 | 12 (Dodeca-Core) | 18 (Octadeca-Core) |
| Threads | 12 | 18 |
| Base clock speed | 2.1 GHz | 4.2 GHz |
| Boost clock speed | 2.4 GHz | 5.3 GHz |
| Multiplier | 21 | no data |
| L1 cache | 672 KB | 192 KB (per core) |
| L2 cache | 12 MB | 3 MB (per core) |
| L3 cache | 12 MB | 30 MB (shared) |
| Chip lithography | 14 nm | 3 nm |
| Die size | no data | 243 mm2 |
| Maximum core temperature | 78 °C | no data |
| Number of transistors | no data | 17,800 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | no data |
| Unlocked multiplier | - | + |
Compatibility
Information on Atom C3850 and Core Ultra 5 250KF Plus 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 | 1851 |
| Power consumption (TDP) | 25 Watt | 125 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Atom C3850 and Core Ultra 5 250KF Plus. You'll probably need this information if you require some particular technology.
| AES-NI | + | + |
| AVX | - | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| QuickAssist | - | no data |
| Turbo Boost Technology | 2.0 | no data |
| Hyper-Threading Technology | - | no data |
| SIPP | - | + |
Security technologies
Atom C3850 and Core Ultra 5 250KF Plus technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
| EDB | + | no data |
| Secure Boot | + | no data |
| SGX | - | no data |
| OS Guard | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Atom C3850 and Core Ultra 5 250KF Plus are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Atom C3850 and Core Ultra 5 250KF Plus. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4: 2400 | DDR5 |
| Maximum memory size | 256 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 34.134 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 C3850 and Core Ultra 5 250KF Plus.
| PCIe version | 3 | 5.0 |
| PCI Express lanes | 16 | 24 |
| USB revision | 3 | no data |
| Total number of SATA ports | 16 | no data |
| Number of USB ports | 8 | no data |
| Integrated LAN | 2x10/2.5/1 GBE | no data |
Pros & cons summary
| Recency | 15 August 2017 | 11 March 2026 |
| Physical cores | 12 | 18 |
| Threads | 12 | 18 |
| Chip lithography | 14 nm | 3 nm |
| Power consumption (TDP) | 25 Watt | 125 Watt |
Atom C3850 has 400% lower power consumption.
Ultra 5 250KF Plus, on the other hand, has an age advantage of 8 years, 50% more physical cores and 50% more threads, and a 366.7% more advanced lithography process.
We couldn't decide between Intel Atom C3850 and Intel Core Ultra 5 250KF Plus. We've got no test results to judge.
Be aware that Atom C3850 is a server/workstation processor while Core Ultra 5 250KF Plus is a desktop one.
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