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Intel Celeron 3855U

Intel Celeron 3855U
Intel Celeron 3855U processor review

Intel Celeron 3855U in 2026: Too Slow Even for Basic Tasks

The Intel Celeron 3855U was released at the end of 2015 as an inexpensive mobile processor for basic laptops. It has two cores, two threads, and a fixed clock speed of 1.6 GHz, with no Turbo Boost or Hyper-Threading. In 2026, that is no longer enough for comfortable everyday use: with several browser tabs and background applications open, two cores quickly become a limitation.

The processor belongs to the Skylake generation and is manufactured using a 14 nm process. Its TDP is 15 W, while a cTDP-down mode of up to 10 W is also available. Noticeably faster Core i3 processors from the same generation had the same power consumption level, so the 3855U’s low performance cannot be explained by an especially power-efficient operating mode.

Performance

To evaluate the Celeron 3855U, it is useful to compare it with the Pentium 4415U and Core i3-6100U. All three processors are 15 W mobile-class models, but the Pentium and Core i3 have four threads and operate at significantly higher clock speeds.

Processor Cores / Threads Geekbench 6 Single Geekbench 6 Multi PassMark CPU Mark
Celeron 3855U 2 / 2 312 550 1,218
Pentium 4415U 2 / 4 558 985 2,257
Core i3-6100U 2 / 4 771 1,612 2,619

The Pentium 4415U is almost twice as fast in PassMark, while the Core i3-6100U is more than twice as fast as the Celeron 3855U. The gap is especially noticeable in the multi-threaded Geekbench 6 test.

The reason is not just Hyper-Threading. The Celeron runs at 1.6 GHz, while the Pentium 4415U and Core i3-6100U have a clock speed of 2.3 GHz. For a dual-core processor, this difference has a noticeable impact on browser performance, software installation, updates, and switching between applications.

An SSD reduces system boot and application launch times, but it does not eliminate the processor’s own limitations.

Intel HD Graphics 510

The Celeron 3855U features integrated Intel HD Graphics 510 from the Skylake GT1 generation. It contains 12 execution units and operates at frequencies from 300 to 900 MHz. It has no dedicated video memory and uses system RAM instead.

HD Graphics 510 handles desktop output and video playback, including hardware decoding of H.265/HEVC. DisplayPort supports resolutions of up to 4K at 60 Hz.

This graphics solution is too slow for modern games. Even older titles generally require low settings and resolutions, while in more demanding games both the GPU and the weak dual-core CPU become limitations at the same time.

Laptops Featuring the Celeron 3855U

The processor was installed primarily in inexpensive business and education-oriented models. These include:

  • HP ProBook 430 G3
  • HP ProBook 11 G2
  • Dell Inspiron 13 5368 2-in-1
  • Dell Chromebook 3380
  • Dell Vostro 15 3568
  • Lenovo ThinkPad 13
  • Lenovo ThinkPad 13 Chromebook

The configuration of a particular laptop has a noticeable effect on its usability. A version with an SSD and 8 GB of RAM will be noticeably faster than a system with an HDD and 4 GB of RAM, but the processor will still remain the main limitation.

Is It Worth Using the Celeron 3855U in 2026?

The processor can still handle word processing, simple spreadsheets, video playback, and a few lightweight web pages. An SSD and at least 8 GB of RAM are recommended for these tasks.

Performance is no longer sufficient for videoconferencing, a large number of browser tabs, modern office applications, photo editing, or working in a demanding IDE.

Buying a laptop with a Celeron 3855U in 2026 is not worthwhile, except when it is being sold for a token amount and is needed for one simple task. Even Pentium and Core i3 processors from the same period are much faster, while significantly more powerful systems can be found among newer used laptops.

The age of these devices should also be taken into account. The battery, storage drive, cooling system, and display generally have the same service life as the processor itself.

Conclusion

The Intel Celeron 3855U was one of the entry-level mobile processors of the Skylake generation. Its two cores without Hyper-Threading, 1.6 GHz clock speed, and lack of Turbo Boost seriously limited it even when it was released.

In 2026, the 3855U no longer provides enough performance for comfortable everyday use. If you already have a laptop with this processor, it can still be used for simple tasks after installing an SSD and adding sufficient memory. For a purchase, it is better to look for a faster processor.

CPU Comparison

Compare Celeron 3855U with other CPUs

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Basic

Label Name
Intel
Platform
Mobile
Launch Date
October 2015
Model Name
?
The Intel processor number is just one of several factors - along with processor brand, system configurations, and system-level benchmarks - to be considered when choosing the right processor for your computing needs.
3855U
Code Name
SkyLake

CPU Specifications

Total Cores
?
Cores is a hardware term that describes the number of independent central processing units in a single computing component (die or chip).
2
Total Threads
?
Where applicable, Intel® Hyper-Threading Technology is only available on Performance-cores.
2
Basic Frequency
1.60 GHz
Intel Virtualization Technology (VT-x)
?
Intel® Virtualization Technology (VT-x) allows one hardware platform to function as multiple “virtual” platforms. It offers improved manageability by limiting downtime and maintaining productivity by isolating computing activities into separate partitions.
Yes
Intel Virtualization Technology for Directed I/O (VT-d)
?
Intel® Virtualization Technology for Directed I/O (VT-d) continues from the existing support for IA-32 (VT-x) and Itanium® processor (VT-i) virtualization adding new support for I/O-device virtualization. Intel VT-d can help end users improve security and reliability of the systems and also improve performance of I/O devices in virtualized environments.
Yes
Enhanced Intel SpeedStep Technology
?
Enhanced Intel SpeedStep® Technology is an advanced means of enabling high performance while meeting the power-conservation needs of mobile systems. Conventional Intel SpeedStep® Technology switches both voltage and frequency in tandem between high and low levels in response to processor load. Enhanced Intel SpeedStep® Technology builds upon that architecture using design strategies such as Separation between Voltage and Frequency Changes, and Clock Partitioning and Recovery.
Yes
Intel Hyper-Threading Technology
?
Intel® Hyper-Threading Technology (Intel® HT Technology) delivers two processing threads per physical core. Highly threaded applications can get more work done in parallel, completing tasks sooner.
No
Intel Turbo Boost Technology
?
Intel® Turbo Boost Technology dynamically increases the processor's frequency as needed by taking advantage of thermal and power headroom to give you a burst of speed when you need it, and increased energy efficiency when you don’t.
No
Cache
?
CPU Cache is an area of fast memory located on the processor. Intel® Smart Cache refers to the architecture that allows all cores to dynamically share access to the last level cache.
2 MB Intel® Smart Cache
CPU Socket
?
The socket is the component that provides the mechanical and electrical connections between the processor and motherboard.
FCBGA1356
Intel AES New Instructions
?
Intel® AES New Instructions (Intel® AES-NI) are a set of instructions that enable fast and secure data encryption and decryption. AES-NI are valuable for a wide range of cryptographic applications, for example: applications that perform bulk encryption/decryption, authentication, random number generation, and authenticated encryption.
Yes
Technology
?
Lithography refers to the semiconductor technology used to manufacture an integrated circuit, and is reported in nanometer (nm), indicative of the size of features built on the semiconductor.
14 nm
TDP
15 W
Max. Operating Temperature
?
Junction Temperature is the maximum temperature allowed at the processor die.
100°C
PCI Express Version
?
PCI Express Revision is the supported version of the PCI Express standard. Peripheral Component Interconnect Express (or PCIe) is a high-speed serial computer expansion bus standard for attaching hardware devices to a computer. The different PCI Express versions support different data rates.
2.0
Max Number of PCI Express Lanes
?
A PCI Express (PCIe) lane consists of two differential signaling pairs, one for receiving data, one for transmitting data, and is the basic unit of the PCIe bus. Max # of PCI Express Lanes is the total number of supported lanes.
10
Instruction Set
?
The instruction set is a hard program stored inside the CPU that guides and optimizes CPU operations. With these instruction sets, the CPU can run more efficiently. There are many manufacturers that design CPUs, which results in different instruction sets, such as the 8086 instruction set for the Intel camp and the RISC instruction set for the ARM camp. x86, ARM v8, and MIPS are all codes for instruction sets. Instruction sets can be extended; for example, x86 added 64-bit support to create x86-64. Manufacturers developing CPUs that are compatible with a certain instruction set need authorization from the instruction set patent holder. A typical example is Intel authorizing AMD, enabling the latter to develop CPUs compatible with the x86 instruction set.
64-bit
Intel 64
?
Intel® 64 architecture delivers 64-bit computing on server, workstation, desktop and mobile platforms when combined with supporting software.¹ Intel 64 architecture improves performance by allowing systems to address more than 4 GB of both virtual and physical memory.
Yes
Intel VT-x with Extended Page Tables (EPT)
?
Intel® VT-x with Extended Page Tables (EPT), also known as Second Level Address Translation (SLAT), provides acceleration for memory intensive virtualized applications. Extended Page Tables in Intel® Virtualization Technology platforms reduces the memory and power overhead costs and increases battery life through hardware optimization of page table management.
Yes
PCI Express Configurations
?
PCI Express (PCIe) Configurations describe the available PCIe lane configurations that can be used to link to PCIe devices.
1x4 | 2x2 | 1x2+2x1 and 4x1

Memory Specifications

Memory Type
?
Intel® processors come in four different types: Single Channel, Dual Channel, Triple Channel, and Flex Mode. Maximum supported memory speed may be lower when populating multiple DIMMs per channel on products that support multiple memory channels.
DDR4-1866/2133 | LPDDR3-1600/1866 | DDR3L-1333/1600
Max Memory Size
?
Max memory size refers to the maximum memory capacity supported by the processor.
32 GB
Memory Channels
?
The number of memory channels refers to the bandwidth operation for real world application.
2
Bus Speed
4 GT/s
Max Memory Bandwidth
?
Max Memory bandwidth is the maximum rate at which data can be read from or stored into a semiconductor memory by the processor (in GB/s).
34.1 GB/s
ECC Memory Support
?
ECC Memory Supported indicates processor support for Error-Correcting Code memory. ECC memory is a type of system memory that can detect and correct common kinds of internal data corruption. Note that ECC memory support requires both processor and chipset support.
No
Intel Flex Memory Access
Yes

GPU Specifications

Integrated Graphics Model
?
An integrated GPU refers to the graphics core that is integrated into the CPU processor. Leveraging the processor's powerful computational capabilities and intelligent power efficiency management, it delivers outstanding graphics performance and a smooth application experience at a lower power consumption.
Intel® HD Graphics 510
Graphics Base Frequency
?
Graphics Base frequency refers to the rated/guaranteed graphics render clock frequency in MHz.
300 MHz
Graphics Frequency
?
Graphics max dynamic frequency refers to the maximum opportunistic graphics render clock frequency (in MHz) that can be supported using Intel® HD Graphics with Dynamic Frequency feature.
900 MHz
4K Support
Yes | at 60Hz
Graphics Video Max Memory
32 GB
DirectX Support
?
DirectX* Support indicates support for a specific version of Microsoft’s collection of APIs (Application Programming Interfaces) for handling multimedia compute tasks.
12
Max Resolution (DP)
?
Max Resolution (DP) is the maximum resolution supported by the processor via the DP interface (24bits per pixel & 60Hz). System or device display resolution is dependent on multiple system design factors; actual resolution may be lower on your system.
4096x2304@60Hz
Max Resolution (eDP - Integrated Flat Panel)
?
Max Resolution (Integrated Flat Panel) is the maximum resolution supported by the processor for a device with an integrated flat panel (24bits per pixel & 60Hz). System or device display resolution is dependent on multiple system design factors; actual resolution may be lower on your device.
4096x2304@60Hz
Max Resolution (HDMI)
?
Max Resolution (HDMI) is the maximum resolution supported by the processor via the HDMI interface (24bits per pixel & 60Hz). System or device display resolution is dependent on multiple system design factors; actual resolution may be lower on your system.
4096x2304@24Hz
Number of Displays Supported
3
Graphics Output
?
Graphics Output defines the interfaces available to communicate with display devices.
eDP/DP/HDMI/DVI
Intel Clear Video HD Technology
?
Intel® Clear Video HD Technology, like its predecessor, Intel® Clear Video Technology, is a suite of image decode and processing technologies built into the integrated processor graphics that improve video playback, delivering cleaner, sharper images, more natural, accurate, and vivid colors, and a clear and stable video picture. Intel® Clear Video HD Technology adds video quality enhancements for richer color and more realistic skin tones.
Yes
OpenGL Support
?
OpenGL (Open Graphics Library) is a cross-language, multi-platform API (Application Programming Interface) for rendering 2D and 3D vector graphics.
4.4
Intel Quick Sync Video
?
Intel® Quick Sync Video delivers fast conversion of video for portable media players, online sharing, and video editing and authoring.
Yes

Miscellaneous

Intel Standard Manageability (ISM)
?
Intel® Standard Manageability is the manageability solution for Intel vPro® Essentials platforms and is a subset of Intel® AMT with out-of-band management over Ethernet and Wi-Fi, but no KVM or new life cycle management features.
Intel® SSE4.1 | Intel® SSE4.2
Execute Disable Bit
?
Execute Disable Bit is a hardware-based security feature that can reduce exposure to viruses and malicious-code attacks and prevent harmful software from executing and propagating on the server or network.
Yes
Intel OS Guard
No

Benchmarks

Geekbench 6
Single Core Score
340
Geekbench 6
Multi Core Score
525
Geekbench 5
Single Core Score
327
Geekbench 5
Multi Core Score
554
Passmark CPU
Single Core Score
956
Passmark CPU
Multi Core Score
1274

Compared to Other CPU

Geekbench 6 Single Core
Core i7-4770TE
408 +20%
Celeron 5205U
376 +10.6%
Celeron 3855U
340
A8-3800
290 -14.7%
Atom x7-E3950
238 -30%
Geekbench 6 Multi Core
Atom x7-E3950
734 +39.8%
Core i3-2310M
640 +21.9%
Celeron 3855U
525
A4-3300M
393 -25.1%
A4-1250
188 -64.2%
Geekbench 5 Single Core
Athlon X4 840
394 +20.5%
A4-4000
363 +11%
Celeron 3855U
327
Opteron 2222
287 -12.2%
Pentium N3710
232 -29.1%
Geekbench 5 Multi Core
PRO A4-8350B
762 +37.5%
Xeon E5-2658 v4
661 +19.3%
Celeron 3855U
554
Xeon E5-2623 v4
417 -24.7%
E2-1800
262 -52.7%
Passmark CPU Single Core
Core i3-6102E
1068 +11.7%
Atom x6427FE
1016 +6.3%
Celeron 3855U
956
Opteron 6274
871 -8.9%
Pentium P6300
772 -19.2%
Passmark CPU Multi Core
A4 PRO-7350B
1544 +21.2%
Celeron G555
1388 +8.9%
Celeron 3855U
1274
Atom x5-Z8550
1151 -9.7%
A6-4400M
1006 -21%

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