Celeron 3865U

Details and Benchmarks for Intel Celeron 3865U

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Benchmark Results

Combined benchmark scores based on multiple data points, giving a quick overview of this processor's performance.

Overall Score

Overall score for Celeron 3865U based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,246 Rank: 1603
Rank Name Score Visual
1599 Atom C3858 4,250
+0.1%
1600 Celeron J4105 4,249
+0.1%
1601 Core i3-4010U 4,247
+0%
1602 Phenom II X4 B93 4,247
+0%
1603 Celeron 3865U 4,246
1604 Celeron N2820 4,246
+0%
1605 Celeron 1037U 4,244
+-0%
1606 Core 2 Duo E6750 4,244
+-0%
1607 A8-3820 4,244
+-0%
1608 Celeron G540 4,242
-0.1%

View full ranking →

Multicore Score

Multicore performance score for Celeron 3865U based on multi-threaded benchmark results.

4,323 Rank: 1679
Rank Name Score Visual
1675 Core 2 Duo E7600 4,325
+0%
1676 Athlon II X2 255 4,324
+0%
1677 A8-4500M 4,324
+0%
1678 Celeron N3160 4,324
+0%
1679 Celeron 3865U 4,323
1680 Phenom X4 9650 4,323
+0%
1681 Pentium G2020 4,322
+-0%
1682 A4-7300 4,322
+-0%
1683 Intel Celeron N3160 4,321
+-0%
1684 A6-7400K 4,321
+-0%

View full ranking →

Singlecore Score

Single-core performance score for Celeron 3865U based on single-threaded benchmark results.

4,195 Rank: 1582
Rank Name Score Visual
1578 Pentium E5500 4,199
+0.1%
1579 Celeron G540 4,196
+0%
1580 Pentium B960 4,195
+0%
1581 Celeron J4005 4,195
+0%
1582 Celeron 3865U 4,195
1583 Pentium 3805U 4,193
+-0%
1584 Pentium G645T 4,192
-0.1%
1585 A10-6700T 4,191
-0.1%
1586 Athlon II X3 440 4,191
-0.1%
1587 Celeron G1820TE 4,191
-0.1%

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Workload Scores

Performance scores grouped by workload type, normalized and aggregated from multiple raw benchmark results.

Number Crunching

Aggregated score for Celeron 3865U based on integer math, floating point math, and prime number computation benchmarks.

4,499 Rank: 1537
Rank Name Score Visual
1533 Core i5-4210Y 4,500
+0%
1534 A8-3520M 4,500
+0%
1535 Pentium G640T 4,500
+0%
1536 Core i3-370M 4,500
+0%
1537 Celeron 3865U 4,499
1538 Phenom II X2 555 4,499
+0%
1539 A6-5350M 4,499
+0%
1540 Athlon 5150 4,499
+0%
1541 Celeron J4005 4,498
+-0%
1542 Celeron 1005M 4,498
+-0%

View full ranking →

Data Processing

Aggregated score for Celeron 3865U based on data encryption, data compression, and string sorting benchmarks.

4,458 Rank: 1609
Rank Name Score Visual
1605 Pentium B970 4,459
+0%
1606 Core i5-4300Y 4,459
+0%
1607 Atom Z3740D 4,459
+0%
1608 Celeron N2910 4,459
+0%
1609 Celeron 3865U 4,458
1610 Atom x5-Z8350 4,458
+0%
1611 A6-5350M 4,458
+0%
1612 E2-3200 4,458
+0%
1613 Celeron N3350 4,457
+-0%
1614 Xeon W3503 4,457
+-0%

View full ranking →

Physics & Compute

Aggregated score for Celeron 3865U based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

4,484 Rank: 1508
Rank Name Score Visual
1504 Phenom II X2 565 4,485
+0%
1505 Pentium 4410Y 4,485
+0%
1506 Pentium G640T 4,485
+0%
1507 Core i5-430M 4,485
+0%
1508 Celeron 3865U 4,484
1509 Celeron G540 4,484
+0%
1510 A6-9500E 4,484
+0%
1511 Celeron 2950M 4,484
+0%
1512 Pentium B970 4,483
+-0%
1513 A6-7400K 4,483
+-0%

View full ranking →

Celeron 3865U Details

As of March 2026, the Intel Celeron 3865U remains a niche option in the broader landscape of mobile processors, positioned firmly in the low-power, budget segment. Built on the Kaby Lake microarchitecture and fabricated on a 14 nm process, this dual-core, dual-thread CPU was designed for entry-level laptops and ultrabooks where power efficiency and cost are prioritized over raw performance. While the Celeron line has historically served as Intel's affordable entry point into the mobile market, the 3865U represents a late-generation offering in a segment that has largely been superseded by more capable low-power processors from both Intel and competitors.

The Celeron 3865U operates at a base frequency of 1.8 GHz, with a maximum turbo frequency of 2.2 GHz, reflecting its conservative power envelope. It features 2 MiB of L3 cache and 0.5 MiB of L2 cache, paired with 0.125 MiB of L1 cache split between instruction and data. The processor supports up to 64 GiB of DDR4-2133, DDR3L-1600, and LPDDR3-1866 memory across two channels, delivering a theoretical memory bandwidth of 31.79 GiB/s. Despite its modest core count and clock speeds, it includes a range of modern features such as AES-NI, AVX2, Intel VT-x, and Intel vPro, indicating a design focused on basic security, virtualization, and management capabilities.

The integrated HD Graphics 610 GPU, with 12 execution units and a base frequency of 300 MHz (up to 900 MHz), is suitable for light multimedia tasks and basic video playback but falls short for modern gaming or GPU-intensive applications. It supports up to three displays and includes Intel's Intel Smart Response Technology and Intel Flex Memory Access, enhancing storage and memory responsiveness in low-cost systems. The processor is packaged in FCBGA-1356 and operates within a 15 W TDP, with a downclocked 10 W mode for improved battery life.

In benchmark testing, the Celeron 3865U achieves an overall score of 4246, placing it at #1603 out of 2060 processors, with a single-core score of 4195 (#1580) and a multicore score of 4323 (#1679). These results indicate that while the processor performs comparably to older dual-core CPUs like the Pentium G2020 and A4-7300, it trails behind modern low-power offerings such as the Celeron J4105 and J4005. Its performance is notably weaker in single-threaded workloads compared to contemporary processors, and its multicore performance is constrained by the limited core count and lack of SMT.

Overall, the Celeron 3865U is best suited for basic office tasks, web browsing, and media consumption in entry-level mobile devices. It is not competitive in performance-critical applications or modern computing environments, and its relevance has diminished with the release of more advanced and efficient processors. For users requiring higher performance, even modest upgrades like the Intel Pentium Silver N5000 or AMD A6-7400K offer better value and capability.
Frequently Compared

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Intel Celeron 3865U

Main Specifications

Designer: Intel
Name: Celeron 3865U
Family: Celeron
Series: 3800
Model Number: 3865U
Cores: 2
Threads: 2
Base Frequency: 1800 MHz
Clock Multiplier: 22x (locked)
Microarchitecture: Kaby Lake
Core Name: Kaby Lake U
Core Family: 6
Core Model: 142
Package: FCBGA-1356
Target Segment: Mobile
Max CPUs: 1
TDP: 15 W

Cache Specifications

L1 Cache: 128 KiB
L1 Instruction Cache: 64 KiB (8-way set associative)
L1 Data Cache: 64 KiB (8-way set associative)
L2 Cache: 0.5 MiB (4-way set associative)
L3 Cache: 2 MiB (12-way set associative)

Memory Specifications

Supported Memory Type: LPDDR3-1866 DDR3L-1600 and DDR4-2133
Memory Channels: 2
Maximum Memory: 64 GB
Maximum Bandwidth: 31.79 GB/s
ECC Support: No

Integrated Graphics

GPU: HD Graphics 610
GPU Designer: Intel
GPU Max Frequency: 900 MHz
Execution Units: 12

Physical Specifications

Process: 14 nm
Manufacturer: Intel
Technology: CMOS
Word Size: 64-bit
ISA: x86-64 (x86)

CPU Features

MMX EMMX SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 ABM BMI1 BMI2 AES RdRand ADX CLMUL F16C x86-16 x86-32 x86-64 Real Protected SMM FPU NX EIST SST vPro VT-x VT-d EPT MPX SGX Secure Key SMEP Flex Memory MWT ISRT
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