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Intel Core i5-2405S

Intel Core i5-2405S

Intel Core i5-2405S: A Retrospective and Relevance in 2025

Introduction

Even 14 years after its release, Intel Sandy Bridge processors continue to find applications in budget systems. The Intel Core i5-2405S is one such "veteran." In this article, we will explore who might be interested in this CPU in 2025, its strengths and weaknesses, and how to build a functional PC around it.

1. Key Specifications: Architecture and Performance

Sandy Bridge Architecture

Released in 2011, the i5-2405S belongs to the Sandy Bridge generation-a revolutionary architecture for its time. It offered a 10-15% improvement in IPC (Instructions Per Cycle) compared to its predecessor, Nehalem. However, by 2025, it is noticeably outdated due to the lack of support for PCIe 3.0, modern AVX2/AVX-512 instructions, and energy-efficient modes.

32nm Process Technology

The 32nm technology appears archaic in 2025 compared to 5-7nm chips (like Intel Alder Lake or AMD Ryzen 7000). This results in higher heat output and limited miniaturization opportunities.

Performance

- Geekbench 6: Single-Core - 557, Multi-Core - 1480. For comparison, the budget Intel Celeron G6900 (2023) scores around 1500/3000.

- 4 Cores/4 Threads: Limited parallel processing, which is critical for multitasking.

Key Features

- Support for AES-NI for encryption.

- No Hyper-Threading technology-only 4 threads.

- Integrated Intel HD Graphics 2000: adequate for display output but not for gaming.

2. Compatible Motherboards

LGA1155 Socket

The processor requires motherboards with the LGA1155 socket. In 2025, new boards are no longer being produced-only used options are available.

Chipsets

- H61, B65: Budget solutions without overclocking and some features.

- H67, P67, Z68: Overclocking support (only for CPUs with a K multiplier, such as i5-2500K), SATA III, and USB 3.0 (on some models).

Selection Tips

- Look for boards with USB 3.0 and SATA III (e.g., ASUS P8H67) to enhance performance with SSDs and external drives.

- Check the condition of capacitors and the socket when buying used.

3. Supported Memory

Memory Type

The i5-2405S only works with DDR3:

- Frequencies: 1066/1333 MHz.

- Maximum capacity: up to 32 GB (depends on the motherboard).

Limitations

DDR4/DDR5 is not supported. Even inexpensive DDR3-1600 modules will operate at the reduced frequency of 1333 MHz.

Recommendations

- Use dual-channel configuration (2x8 GB) to enhance performance.

- An SSD is essential: even a SATA III drive will "revive" the system.

4. Power Supply: Power Calculation

TDP 65W

The processor is energy-efficient, but it's important to consider other components:

- Graphics card: For example, GTX 1650 (TDP 75W)-requires 300-350W.

- Drives and peripherals: +50W.

Recommended PSUs

- Without a discrete graphics card: 300W (e.g., be quiet! SFX Power 3).

- With a graphics card: 450-500W (Corsair CX450).

Important

- Choose power supplies with an 80+ Bronze certification or higher.

- Avoid no-name brands-a higher risk of failure.

5. Pros and Cons

Advantages

- Low price: A used processor costs around $15-25.

- Reliability: Sandy Bridge CPUs are known for their long lifespan.

- Suitable for basic tasks: office use, browsing, HD video.

Disadvantages

- No support for modern technologies: PCIe 3.0, USB 3.1, NVMe.

- Poor performance in multi-threaded applications.

- Limited upgradability: replacing it with a more powerful CPU would require a platform change.

6. Use Cases

Office Tasks

- Example: PC with 8GB DDR3, 240GB SSD, and HD Graphics 2000.

- Document editing, Zoom conferences, working in 10+ browser tabs (with light websites).

Multimedia

- Playing 1080p/60fps: manageable, but 4K or HDR is not supported.

- Connecting to a TV via HDMI: possible, but without hardware decoding for modern codecs (AV1, VP9).

Gaming

- Older titles: Half-Life 2, CS:GO (at low settings - ~40-60 fps).

- Emulators: PlayStation 2 - acceptable performance.

7. Comparison with Competitors

AMD Phenom II X4 965

- Pros: Cheaper (~$10), unlocked multiplier.

- Cons: Higher TDP (125W), weaker in single-threaded tasks.

Intel Core i3-10100 (2020)

- Pros: 4 cores/8 threads, supports DDR4, PCIe 3.0.

- Cons: New platform is more expensive (motherboard + $70).

8. Assembly Tips

Components

- Motherboard: ASUS P8Z68-V LX (used, ~$30-50).

- RAM: 2x8 GB DDR3-1333 (~$25).

- Storage: Kingston A400 480GB ($35).

Optimization

- Install Linux (Lubuntu) to speed up performance on weak hardware.

- Disable unnecessary services in Windows 10/11.

9. Conclusion: Who is the i5-2405S Suitable for in 2025?

This processor is suitable for:

1. Retro computer enthusiasts: Building a PC for old games or experiments.

2. Budget office systems: If you need a PC for $100-150 (considering used components).

3. Backup solutions: Media center, file storage server.

Why Not?

- Insufficient performance for modern gaming, video editing, or AI tasks.

- New processors (like AMD Ryzen 3 5300G) offer better price/performance ratios.

Conclusion

The Intel Core i5-2405S is an example of a "workhorse" CPU that remains useful in niche scenarios after many years. However, in 2025, it should only be considered as a temporary or specialized solution. For most users, investing in modern platforms that support current technologies makes more sense.

CPU Comparison

Compare Core i5-2405S with other CPUs

Please select CPU from the dropdown list.

Basic

Label Name
Intel
Platform
Desktop
Launch Date
May 2011
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.
i5-2405S
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).
4
Total Threads
?
Where applicable, Intel® Hyper-Threading Technology is only available on Performance-cores.
4
Basic Frequency
2.50 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.
No
Max Turbo Frequency
?
Max Turbo Frequency is the maximum single-core frequency at which the processor is capable of operating using Intel® Turbo Boost Technology and, if present, Intel® Turbo Boost Max Technology 3.0 and Intel® Thermal Velocity Boost. Frequency is typically measured in gigahertz (GHz), or billion cycles per second.
3.30 GHz
Instruction Set Extensions
Intel® SSE4.1 | Intel® SSE4.2 | Intel® AVX
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.
2.0
Intel Turbo Boost Technology 2.0 Frequency
3.30 GHz
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.
6 MB Intel® Smart Cache
CPU Socket
?
The socket is the component that provides the mechanical and electrical connections between the processor and motherboard.
FCLGA1155 | LGA1155
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.
32 nm
TDP
65 W
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.
16
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

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.
32 GB
Memory Channels
?
The number of memory channels refers to the bandwidth operation for real world application.
2
Bus Speed
5 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).
21 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

GPU Name
Intel® HD Graphics 3000
Graphics Base Frequency
?
Graphics Base frequency refers to the rated/guaranteed graphics render clock frequency in MHz.
850 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.
1.10 GHz
Number of Displays Supported
2
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
Intel InTru 3D Technology
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.
Yes

Miscellaneous

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

Benchmarks

Geekbench 6
Single Core Score
557
Geekbench 6
Multi Core Score
1480
Geekbench 5
Single Core Score
593
Geekbench 5
Multi Core Score
1711
Passmark CPU
Single Core Score
1434
Passmark CPU
Multi Core Score
3157

Compared to Other CPU

Geekbench 6 Single Core
Core i7-3540M
634 +13.8%
Pentium G4560T
593 +6.5%
Core i5-2405S
557
Core i7-2620M
516 -7.4%
A10-6800K
486 -12.7%
Geekbench 6 Multi Core
Core i7-2820QM
1763 +19.1%
Pentium G4620
1603 +8.3%
Core i5-2405S
1480
Celeron J6413
1321 -10.7%
A10 PRO-7850B
1171 -20.9%
Geekbench 5 Single Core
Xeon E3-1265L v3
642 +8.3%
Xeon E7-8880 v2
616 +3.9%
Core i5-2405S
593
Celeron G4930E
574 -3.2%
Xeon E5-4620
557 -6.1%
Geekbench 5 Multi Core
Core i3-1115GRE
1980 +15.7%
Athlon 3000G
1867 +9.1%
Core i5-2405S
1711
Core i3-9100HL
1607 -6.1%
Core m3-7Y32
1506 -12%
Passmark CPU Single Core
Athlon X4 840
1488 +3.8%
FX-4150
1465 +2.2%
Core i5-2405S
1434
Celeron G3900TE
1402 -2.2%
Celeron J6412
1375 -4.1%
Passmark CPU Multi Core
A12-9800E
3471 +9.9%
Celeron N5100
3306 +4.7%
Core i5-2405S
3157
Xeon L5630
3018 -4.4%
Core i7-3520M
2865 -9.2%