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Intel Celeron B815

Intel Celeron B815: a humble worker for basic tasks in the miniaturization era

An analysis of the capabilities of an outdated processor in 2025 and its place in the market

Architecture and Technology Process: The Legacy of Sandy Bridge

The Intel Celeron B815, released in 2012, is built on Sandy Bridge architecture (32 nm). This dual-core processor lacks Hyper-Threading support, which limits it to two threads. The base clock speed is 1.6 GHz, and there is no turbo mode, which is typical for the budget Celeron line. The integrated graphics are Intel HD Graphics (Sandy Bridge generation) with a base clock of 650 MHz and dynamic boosting up to 1050 MHz. It supports basic video decoding (H.264, VC-1) and can output resolutions up to 2560x1600 pixels.

Key architectural features:

- No Turbo Boost — fixed frequency even under load.

- 2 MB of L3 cache — minimal for the 2010s era.

- Support for DDR3-1333 MHz — an outdated standard by 2025.

Power Consumption and TDP: A Compromise Between Power and Battery Life

The processor's TDP is 35 W. For modern ultrabooks, this is a high figure (for example, the Intel Core i5-1235U from 2023 has a TDP of 15 W), but at the time, the B815 was positioned as a solution for budget laptops with passive cooling or compact coolers. In practice, this meant:

- Noise under load (for example, when launching a browser with 10 tabs).

- Limited performance in multitasking.

Performance: What Can the Celeron B815 Do in 2025?

Geekbench 6 results (Single-Core: 246, Multi-Core: 439) show that the processor falls behind even budget smartphones from 2025 (for example, the Snapdragon 7 Gen 3 scores around 1200 points in Single-Core). However, it is still relevant for niche tasks:

1. Office Work:

- Microsoft Office, Google Workspace — document handling without issues, but slowdowns occur when simultaneously running Zoom and 10 Chrome tabs.

- It is recommended to use lightweight OS: Linux Mint, Windows 10 LTSC.

2. Multimedia:

- 1080p video playback (YouTube, local files) — manageable, but 4K is not supported.

- Photo editing in Paint.NET — acceptable for basic retouching.

3. Gaming:

- Older games (Half-Life 2, Minecraft on minimum settings) — 20-30 FPS.

- Modern projects (even Among Us) — lags and low frame rates.

Usage Scenarios: Who is the B815 Suitable for in 2025?

- Students: For text and presentation work.

- Seniors: Simple tasks: email, news, Skype.

- Offices: Terminals for data entry or cash registers.

Important! The processor is not suitable for:

- Video editing.

- Running virtual machines.

- Modern browsers with active scripts.

Battery Life: How Long Will the Laptop Last?

With a TDP of 35 W and no modern energy-saving technologies (such as those found in Intel's 7nm chips), the battery life of a laptop with the B815 depends on the battery capacity:

- With a 40 W·h battery — 3-4 hours in PDF viewing mode.

- Energy-saving technologies: only Intel SpeedStep (dynamic frequency change) and C-states (turning off cores during idle).

Tip: Reduce screen brightness and turn off Wi-Fi to save battery.

Comparison with Competitors: Who Was Stronger?

1. AMD E2-1800 (2012):

- Similar scores in Geekbench 6 (Single-Core ~230), but better graphics with Radeon HD 7340.

- Downside: higher heat generation.

2. Intel Pentium 2020T (Ivy Bridge, 2013):

- 15% faster in multi-threading, with Turbo Boost up to 2.5 GHz.

3. Apple A10 Fusion (2016):

- Single-Core ~750 in Geekbench 6 — three times faster than B815.

In 2025: Even budget processors (Intel N100, AMD Athlon Silver 7120U) outperform the B815 by 4-5 times in performance with a TDP of 6-10 W.

Pros and Cons of the Celeron B815

Strengths:

- Low cost of laptops (new devices, if still available, — $200-250).

- Sufficient performance for Linux and lightweight operating systems.

- Repairability — CPU and RAM replacement is possible.

Weaknesses:

- No support for NVMe, USB 3.0, Wi-Fi 6.

- Outdated graphics without AV1 decoding.

- Limited multitasking.

Recommendations for Laptop Selection

If you consider a device with the B815 in 2025:

1. Device Type: Budget laptop for education (e.g., Acer Aspire E1-531).

2. Mandatory Parameters:

- SSD instead of HDD (even SATA III will speed things up).

- 8 GB DDR3 (4 GB is insufficient for Windows 10).

- Screen resolution of 1366x768 — higher is pointless.

3. Avoid:

- Gaming laptops with this CPU — it’s a deception.

- Devices without a warranty — high risk of failure.

Final Conclusion: Is It Worth Buying?

The Intel Celeron B815 in 2025 is a choice for those who need a very cheap laptop for:

- Text typing.

- Viewing lectures in 720p format.

- Working with office applications from ten years ago.

Key Benefits:

- Price under $250 for new devices (if such devices still exist).

- Ease of repair.

- Compatibility with lightweight operating systems.

However, even budget Chromebooks with ARM processors ($300) will offer better battery life and speed. The Celeron B815 is a "workhorse" of the past that may still have use in niche scenarios, but no more than that.

Basic

Label Name

Intel

Platform

Mobile

Launch Date

January 2012

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.

B815

Code Name

Sandy Bridge

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).

Total Threads

Where applicable, Intel® Hyper-Threading Technology is only available on Performance-cores.

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.

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.

CPU Socket

The socket is the component that provides the mechanical and electrical connections between the processor and motherboard.

FCPGA988 | PGA988

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.

32 nm

Max. Operating Temperature

Junction Temperature is the maximum temperature allowed at the processor die.

100C

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

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.

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

PCI Express Configurations

PCI Express (PCIe) Configurations describe the available PCIe lane configurations that can be used to link to PCIe devices.

1x16 | 2x8 | 1x8 2x4

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.

DDR3 1066/1333

Max Memory Size

Max memory size refers to the maximum memory capacity supported by the processor.

16 GB

Memory Channels

The number of memory channels refers to the bandwidth operation for real world application.

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).

21.3 GB/s

ECC Memory Supported

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.

GPU Specifications

GPU Name

Intel® HD Graphics for 2nd Generation Intel® Processors

Graphics Base Frequency

Graphics Base frequency refers to the rated/guaranteed graphics render clock frequency in MHz.

650 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.

1.05 GHz

Number of Displays Supported

Graphics Output

Graphics Output defines the interfaces available to communicate with display devices.

eDP/DP/HDMI/SDVO/CRT

Miscellaneous

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.

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

Instruction Set Extensions

Intel® SSE4.1 | Intel® SSE4.2

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

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 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.

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.

Intel InTru 3D Technology

Intel Flex Memory Access

Yes

Intel Quick Sync Video

Intel® Quick Sync Video delivers fast conversion of video for portable media players, online sharing, and video editing and authoring.

Benchmarks

Geekbench 6

Single Core Score

246

Geekbench 6

Multi Core Score

439

Geekbench 5

Single Core Score

200

Geekbench 5

Multi Core Score

312

Passmark CPU

Single Core Score

699

Passmark CPU

Multi Core Score

723

Compared to Other CPU

Geekbench 6 Single Core

Pentium B980

357 +45.1%

A4-4300M

313 +27.2%

A8-3520M

257 +4.5%

Celeron B815

246

Xeon E7-4809 v2

32 -87%

Geekbench 6 Multi Core

Celeron 3865U

693 +57.9%

Pentium B980

601 +36.9%

Core i3-2377M

500 +13.9%

Celeron B815

439

Xeon E7-4809 v2

58 -86.8%

Geekbench 5 Single Core

Pentium N4200

335 +67.5%

E2-3200

298 +49%

E-240

243 +21.5%

Celeron B815

200

Atom Z2520

59 -70.5%

Geekbench 5 Multi Core

A6-5400B

688 +120.5%

A4-6320

588 +88.5%

Pentium U5600

471 +51%

Celeron G465

332 +6.4%

Celeron B815

312

Passmark CPU Single Core

A8-4500M

917 +31.2%

A4-4355M

813 +16.3%

Celeron B815

699

Celeron N2930

581 -16.9%

E2-3800

434 -37.9%

Passmark CPU Multi Core

Celeron G530

1117 +54.5%

Celeron 3205U

946 +30.8%

Celeron B815

723

E-350

486 -32.8%

E-240

195 -73%