CPU Comparison
Intel Core i5-2400 vs Intel Core i5-2405S
A side-by-side comparison of specs, performance and value. The Intel Core i5-2400 served as the baseline standard-power quad-core processor for the Sandy Bridge generation. Operating at a 95W TDP, it removed the power constraints of the 'S' series, allowing for a higher 3.1 GHz base clock and a 3.4 GHz turbo boost. Like other non-K i5s of its era, it operates without Hyper-Threading, strictly limiting it to four concurrent threads. It features the full 6 MB L3 cache and Intel HD 2000 integrated graphics. This chip was the quintessential mainstream desktop CPU of early 2011, offering a significant leap in IPC (Instructions Per Clock) over the previous Lynnfield architecture.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Handles legacy Office suites well, but slow for modern web apps.
CPU performance is identical to the i5-2400S, adequate for legacy apps.
Gaming
Bottlenecks modern GPUs heavily, but great for pre-2015 games.
HD 3000 can handle very old games, but nothing modern.
Virtualization
Adequate for a basic pfSense router or NAS OS.
VM performance is constrained by the 4-thread limit.
Efficiency
Consumes more power per percentage of performance than modern chips.
Excellent power metrics for a quad-core chip of its era.
Specialized Performance
AI / ML
- No AI acceleration
- Cannot run modern local LLMs at usable speeds
- No AI acceleration capabilities
Content Creation
Gaming
- Paired with a GTX 1060, it can run Skyrim and Fallout 3 excellently
- Will severely bottleneck anything above an RTX 2060
- Single-core speed is too low for modern eSports titles like Valorant
- HD 3000 is noticeably faster than HD 2000 in legacy titles
- Still lacks DirectX 12 support
- Not viable for 3D gaming past 2012 standards
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- Very cheap on the used market
- Excellent upgrade path to i7-3770
- Good retro-gaming performance
- Easy to cool
Cons
- No Hyper-Threading
- No modern instruction set support
- High power draw relative to performance
- Locked multiplier
- Weak HD 2000 graphics
Pros
- Intel HD 3000 integrated graphics
- Quick Sync Video support
- Low 65W power draw
- Full 6 MB L3 cache
Cons
- Rare and potentially expensive on the used market
- No Hyper-Threading
- Lower clocks than standard 95W parts
- Lacks AVX2
- Not Windows 11 compatible
Competitors & Alternatives
Intel Core i5-2400
- AMD Phenom II X4 970Rival
Desktop
- AMD FX-4150Rival
Desktop
- AMD A8-3870KRival
Desktop APU
- Compare head-to-headIntel Core i5-760Rival
Desktop
- Intel Xeon E3-1230Rival
Server/Workstation
Better clocks for nearly the same used price.
Compare head-to-head- Intel Core i5-3450Alt
Ivy Bridge upgrade with PCIe 3.0 and lower power.
- AMD FX-6300Alt
More threads for heavily multi-threaded legacy tasks.
- Intel Xeon E3-1245Alt
Better integrated graphics and similar performance.
- Intel Core i7-2600Alt
Adds Hyper-Threading for a significant multi-thread boost.
Intel Core i5-2405S
- AMD A8-3850Rival
Desktop APU
- AMD A6-3670Rival
Desktop APU
- Compare head-to-headIntel Core i5-2400SRival
Desktop
- Intel Core i3-2125Rival
Desktop
- AMD Phenom II X4 860TRival
Desktop
Better CPU clocks and better graphics within the same 65W TDP.
Compare head-to-head- AMD A10-5700Alt
Newer APU platform with significantly better graphics.
- Intel Core i7-2600SAlt
Adds Hyper-Threading for better multi-tasking.
- Intel Xeon E3-1245Alt
Similar HD 3000 graphics but in an 80W standard-power package.
Our Verdict on Each
An iconic processor that dominated the 2011 market, now best suited for retro gaming builds and lightweight server tasks.
Best for: Building a cheap retro-gaming PC or home server using recycled parts
Read the full reviewA niche OEM processor that offered better integrated graphics in a low-power package, now mostly useful for exact-match legacy repairs.
Best for: Replacing a failed CPU in a 2011 Apple iMac or premium AIO
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-2400 or Intel Core i5-2405S?
Based on our editorial ratings, the Intel Core i5-2400 comes out ahead with a score of 5/10. That said, the best choice depends on your workload — check the spec and performance breakdown above for gaming, productivity and efficiency differences.
Which is faster for gaming, Intel Core i5-2400 or Intel Core i5-2405S?
For gaming, the Intel Core i5-2400 leads with a gaming performance score of 20/100 among Intel Core i5-2400 and Intel Core i5-2405S.
Which uses less power?
The Intel Core i5-2405S has the lowest rated TDP. Power draw across these chips: Intel Core i5-2400 (95 W), Intel Core i5-2405S (65 W).
Do Intel Core i5-2400 and Intel Core i5-2405S use the same socket?
Yes — all of these CPUs use the LGA 1155 socket, so they share compatible motherboards.
Which is faster in multi-core benchmarks?
The Intel Core i5-2400 posts the highest multi-core benchmark score. Multi-core results: Intel Core i5-2400 (2,800), Intel Core i5-2405S (2,400). Benchmark figures are approximate and workload-dependent.