Quick Verdict
A power-efficient quad-core chip that is now strictly relegated to keeping legacy small form factor office PCs operational.
Overview
Launch
2011
Status
DiscontinuedGeneration
2nd Gen
Market
Desktop
The Intel Core i5-2400S is a quad-core processor tailored for small form factor desktops that cannot accommodate standard 95W cooling solutions. By maintaining four physical cores but lowering the base and turbo frequencies compared to the standard i5-2400, Intel achieved a 65W thermal envelope. It lacks Hyper-Threading, a defining characteristic of non-K Sandy Bridge i5 processors, meaning it handles four threads natively. Equipped with 6 MB of shared L3 cache and Intel HD 2000 graphics, it provided a balanced blend of multi-core productivity and low-power operation for home and office PCs during its prime.
The Core i5-2400S sacrifices clock speed to fit into a 65W power limit, offering 4 cores at 2.5 GHz with Intel HD 2000 graphics.
Specifications
Performance
Handles basic office tasks but struggles with heavy spreadsheets or modern web apps.
Can run a basic NAS OS or light VM, but limited by 4 threads.
Cannot handle modern AAA games, even at lowest settings.
Good power-to-core ratio for the 32nm era.
- •HD 2000 graphics lack driver support for modern titles
- •Even with a discrete GPU, CPU bottlenecks severely
- •Playable only in legacy esports like CS 1.6
- •No AI hardware capabilities
- •Too slow for practical machine learning inference
Architecture
32nm
Process Node
Sandy Bridge
Codename
4C / 4T
Core Config
6 MB
L3 Cache
65 W
TDP
Architecture Overview
The i5-2400S is fabricated on Intel's 32nm process node, utilizing the full 216 mm² Sandy Bridge die with 1.16 billion transistors. It features a full 6 MB L3 cache shared across its four cores. To meet the 65W TDP requirement, Intel statically configured the base clock at 2.5 GHz with a maximum turbo of 3.3 GHz, lower than its 95W counterpart. The processor integrates a dual-channel DDR3 memory controller and 16 PCIe 2.0 lanes, alongside the HD 2000 integrated graphics silicon, which features 6 Execution Units for basic display and video decoding tasks.
CPU Design
4 physical cores without Hyper-Threading, connected via a high-speed ring bus.
Memory Subsystem
Dual-channel DDR3-1333 integrated memory controller.
PCIe & I/O
16 lanes of PCIe 2.0 for discrete graphics.
Overclocking
Multiplier is locked; BCLK tuning is possible but affects system clocks.
- On-die GPU
- Massive IPC gains over Lynnfield
- Lower idle power consumption
Key Highlights
- True quad-core CPU
- Low 65W power draw
- Cool and quiet operation
- Full 6 MB L3 cache
- No Hyper-Threading
- Low clock speeds
- Outdated HD 2000 graphics
- Not Windows 11 compatible
- Locked multiplier
History
Launched in January 2011 alongside the flagship Sandy Bridge processors, the 'S' variant played a crucial role in the emerging market of sleek, miniaturized desktop towers. At a time when OEMs like HP, Dell, and Lenovo were transitioning away from bulky tower PCs, the 65W quad-core chips provided the necessary thermal headroom for proprietary low-profile cooling solutions. This processor helped bridge the gap between power-hungry standard desktops and underpowered laptop hardware in the small form factor space, ensuring that businesses could have capable machines that fit neatly under monitors or in lockable cabinets.
Improvements over Previous Generation
- On-die GPU
- Massive IPC gains over Lynnfield
- Lower idle power consumption
Alternatives & Competitors
Should You Buy It?
Not Recommended for the right buyer
Direct replacement for a failed CPU in a Dell Optiplex SFF
Avoid if…
- Building a new PC
- Upgrading an existing standard-tower PC
- Doing any video editing
Use Cases
Interesting Facts
The 'S' series was heavily favored by Dell for their Optiplex micro and small form factor business PCs.
It uses the exact same silicon die as the 95W i5-2400, just binned for lower voltage and clocks.
It lacks VT-d (Virtualization for Directed I/O) according to Intel ARK, though it features VT-x.
The lower clock speed means it draws significantly less power than the 95W part under full load.
It was released on the exact same day as the standard i5-2400 (January 9, 2011).
The Intel HD 2000 graphics lack OpenCL support, limiting GPGPU tasks.
It was commonly found in early HP Compaq Elite desktops.
It features a DMI 2.0 connection to the motherboard chipset, offering 20 Gbit/s bandwidth.
The 65W TDP made it a popular choice for home theater PCs (HTPCs) of the era.
Because of the locked multiplier, achieving high overclocks required dangerous base clock adjustments.
People Also Ask
Is the i5-2400S better than the i5-2400?
No, the standard i5-2400 has higher clock speeds and better performance.
What is the difference between i5-2400S and i5-2405S?
The 2405S has Intel HD 3000 graphics instead of HD 2000.
Can I upgrade from i5-2400S to i7-2600S?
Yes, they share the same 65W TDP and LGA 1155 socket.
How many PCIe lanes does the i5-2400S have?
It has 16 PCIe 2.0 lanes.
Is the i5-2400S compatible with Windows 11?
No, it does not meet the minimum system requirements.
What RAM speed does the i5-2400S support?
It natively supports DDR3-1333.
Does the i5-2400S run hot?
No, the 65W TDP keeps temperatures very manageable.
Can the i5-2400S be overclocked?
No, Intel locked the multiplier on non-K CPUs.
What cooler comes with the i5-2400S?
OEMs typically used custom low-profile coolers, not standard retail box coolers.
Is i5-2400S good for Minecraft?
It can run vanilla Minecraft, but heavily modded versions will struggle.
Frequently Asked Questions
What does the 'S' mean in Core i5-2400S?
It indicates a lower-power, 65W thermal design.
Can I put an i5-2400S in a standard desktop motherboard?
Yes, as long as it features the LGA 1155 socket.
Does the i5-2400S support Hyper-Threading?
No, it has 4 cores and 4 threads.
What is the base clock speed of the i5-2400S?
2.5 GHz.
Can I use a 95W cooler on an i5-2400S?
Yes, a larger cooler will work perfectly and run quieter.
Does the i5-2400S have integrated graphics?
Yes, Intel HD 2000.
Is the i5-2400S good for Windows 10?
It runs Windows 10 adequately for basic office tasks.
What is the boost clock of the i5-2400S?
Up to 3.3 GHz.
How much L3 cache does the i5-2400S have?
6 MB of shared L3 cache.
Can the i5-2400S run dual monitors?
Yes, through the Intel HD 2000 graphics.