Intel® Atom™ C3858

The Intel Atom C3858 is a server processor with 12 cores and 12 threads, built on the Denverton architecture. It launched in Jul 2017. Clocks run from 2.0 GHz base to 2.0 GHz boost. A 12-MB L3 cache backs the cores (1.7 MB per core). It addresses DDR4 memory up to 256 GB across 2 channels. The chip drops into the FCBGA1310 socket and exposes PCIe 3.0 (16 lanes). Rated TDP is 25 W. Notable platform capabilities: Extended Page Tables (EPT).

The Intel Atom C3858 scores 702 in single-core performance and 5,040 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 1,881 for overall performance, 4,259 for productivity performance, 4,036 for creator performance, 5,481 for engineering performance and 3,366 for gaming performance. Its multi-core throughput works out to 420 per core, 420 per thread and 202 per watt. Its computed efficiency index is 376. Its performance index is 23, so its overall performance is 77% below the Intel Core i5-12400 (index 100). Each bar shows the score as a share of a reference ceiling, which is the larger of the 99th-percentile score across the Feex CPU database and a fixed baseline.

Scores for individual PassMark CPU Mark test categories. Higher is better. These are measured test scores, not computed from the single-core and multi-core ratings.

In the individual workload tests the Intel Atom C3858 scores 32,465 in integer math, 8,844 in floating-point math, 106,722 in compression, 4,724 in cryptography, 416 in physics simulation, 2,351 in vector SIMD, 17 in the prime sieve and 14,320 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 45% below in integer math, 81% below in floating-point math, 53% below in compression, 59% below in cryptography, 62% below in physics simulation, 85% below in vector SIMD, 75% below in the prime sieve and 37% below in sorting. Each bar shows the score as a share of that workload's reference ceiling, the larger of the 99th-percentile score across CPUs with a recorded value and a fixed baseline.

The Intel Atom C3858 has 12 physical cores and runs 12 logical threads. It does not support simultaneous multithreading, so its thread count equals its core count. It runs at a base clock of 2.00 GHz and boosts up to 2.00 GHz.

The Intel Atom C3858 is a server processor, belongs to the Intel Atom C family, uses the Denverton architecture, carries the codename Denverton and is manufactured on a 14 nm process. It launched in Jul 2017.

The Intel Atom C3858 has 896 KB of L1 cache, 8 MB of L2 cache and 12 MB of L3 cache. That adds up to about 20.9 MB of cache, or 1.74 MB per core.

The Intel Atom C3858 has a 3-level cache hierarchy: L1 at 896 KB, L2 at 8 MB and L3 at 12 MB. L3 is the largest level and makes up about 57% of the cache listed here.

The Intel Atom C3858 supports DDR4 memory, addresses up to 256 GB of memory, uses 2 memory channels and runs memory at up to 2,400 MT/s. It does not support DDR5 and LPDDR memory.

The Intel Atom C3858 uses the FCBGA1310 socket, supports PCI Express 3.0 and provides up to 16 PCIe lanes.

The Intel Atom C3858 has a rated TDP of 25 W.

Instruction sets, security, virtualization, AI acceleration and OS readiness. Features are listed as supported, explicitly not supported, or not recorded; a feature that is not recorded is not the same as unsupported.

The Intel Atom C3858 is manufactured by Intel. It launched at a price of $398.

The Intel Atom C3858 is also identified by the model number C3858.

After an audit, 1 value was corrected on the Intel Atom C3858 record. Each change is listed with its old value, new value, rule and sources.

• PCIe revision: 3 → 3.0. Rule: Cleanup pcie int to decimal. normalize to the dominant "N.0" format.

The audit log is public: all changes for this CPU, the corrections overview and the method.

Feex has recorded 55% of the specifications it tracks for the Intel Atom C3858. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: Performance Cores, Efficiency Cores, Hybrid Architecture, All-Core Boost and Unlocked Multiplier. Architecture & Generation: ISA Family and Market Status. Cache: L2 Cache (per Core) and L4 Cache. Memory Support: Memory Bandwidth and ECC Memory. Graphics: Integrated Graphics, Graphics Model, Graphics Base Clock, Graphics Max Clock, Execution Units, Display Outputs and Max Video Memory. Platform & Compatibility: Package and Package Size. Power & Thermals: Base Power, Maximum Turbo Power, Configurable TDP (Min), Configurable TDP (Max), Max Junction Temperature and Tcase. Physical & Manufacturing: Transistor Count, Die Size, Die Count and Foundry. Naming & Aliases: Normalized Name, SKU, Processor Number and Part Number.

Processors that use the same FCBGA1310 socket as the Intel Atom C3858 and have the closest multi-core scores in the Feex database include Intel Atom C3758R, Intel Atom C3758, Intel Atom C3808, Intel Atom C3958 and Intel Atom C3708.