This article covers Intel CPU Core i5-6400 2.7GHz 6Mキャッシュ 4コア.

Overview

The Intel Core i5-6400 is a 6th-generation Skylake CPU launched in July 2015, designed for entry-level desktop builds. It features 4 cores and 4 threads, a base clock of 2.7 GHz (turbo up to 3.3 GHz), 6 MB of L3 cache, and a 65W TDP. Built on Intel's 14nm process, it includes integrated HD Graphics 530 and supports both DDR4-2133 and DDR3L-1600 memory through the LGA1151 socket. This processor remains a viable option for budget-conscious users who need a reliable workhorse for everyday computing. Office tasks, web browsing, video streaming, and light multitasking run smoothly. The integrated GPU handles 4K display output and basic multimedia, making it a practical choice for a no-frills home PC or a file server. You can still find new units on for around ¥13,000–15,000, and used units are even cheaper. However, its age shows in demanding workloads. Four cores without Hyper-Threading limit performance in modern AAA gaming, video editing, or any heavily multithreaded application. This is strictly a budget entry-level CPU for light duties, not a gaming powerhouse.

Compatibility Guide

The Core i5-6400 uses the LGA1151 socket (Socket H4) and works with Intel 100-series chipsets (H110, B150, H170, Z170). It is also compatible with 200-series chipsets (B250, Z270) after a BIOS update. Make sure your motherboard has the correct BIOS version for Skylake support—most boards released in 2015–2016 are ready out of the box. Memory choices: DDR4-2133 or DDR3L-1600, but not both simultaneously. Check your motherboard's specifications; most modern LGA1151 boards are DDR4-only. The CPU's memory controller can handle up to 64 GB of DDR4 (dual-channel). The included stock cooler is adequate for the 65W TDP. The CPU does not require an aftermarket cooler unless you prioritize noise reduction. For a system with a discrete GPU, we recommend a 400–500W power supply from a reputable brand. With integrated graphics only, 300W is sufficient.

Product Info

The Core i5-6400 was positioned as a mid-range entry model in the Skylake lineup, originally priced around $182. Today it sits firmly in the entry-level segment, often undercut in price by newer budget CPUs but still available as an inexpensive option for legacy platform builds. The integrated HD Graphics 530 supports DisplayPort 1.2, HDMI 1.4, and DVI, with a maximum resolution of 4096×2304@60Hz. Memory bandwidth reaches 34.1 GB/s with DDR4-2133. Warranty coverage depends on the retailer, but Intel's standard boxed processor warranty is three years (check the exact terms with your seller). Given its age, many units sold today are from clearance stock or third-party sellers, so verify warranty details before purchase.

Best Use Cases

  1. Budget Office PC For Microsoft Office, Zoom calls, and web-based workflows, the i5-6400 paired with an SSD and 8–16 GB of RAM delivers a snappy experience. The integrated GPU eliminates the need for a discrete card, keeping power consumption low. 2. Light E-Sports Gaming Rig Pair this CPU with an entry-level GPU like a GeForce GTX 1650 or Radeon RX 6400 to play titles like Valorant, CS2, or Fortnite at 1080p low-med settings. You'll hit 60–100 fps in most e-sports titles, though CPU bottlenecks will occur in CPU-heavy scenes. 3. Home Server / NAS The 65W TDP and stable platform make it ideal for a 24/7 file server, Plex media server, or home automation hub. The iGPU can handle transcoding of one or two 1080p streams without a dedicated GPU. 4. Who Should NOT Buy Skip this CPU if you want to play modern AAA titles at high settings, edit 4K video, or run virtual machines. Also, if you are building a new system from scratch, consider a modern entry-level CPU like the Intel Core i3-12100 or AMD Ryzen 5 5600G for better performance and future upgrade paths.

Things to Consider

The Core i5-6400 is a 10-year-old design. Its single-threaded performance is roughly 30% lower than a modern Core i3-12100, and its multi-threaded performance is less than half. For the same budget (~¥13,000), you could buy a used Ryzen 5 3600 with a compatible motherboard, which would offer dramatically better performance and upgrade potential. Upgrade path within the LGA1151 platform is limited: you can only go up to a Core i7-7700K on the same socket, but those CPUs are often expensive second-hand and still lag behind modern chips. Motherboard VRM quality may also limit higher-end CPU upgrades, especially on H110/B150 boards. The integrated HD Graphics 530 is fine for display output and basic tasks, but it cannot run modern 3D games at playable frame rates. A discrete GPU is mandatory for any gaming. Also, Windows 11 is not officially supported; security updates for Windows 10 end in October 2025, so long-term viability is a concern. ## FAQ
Q: Can I overclock the Core i5-6400? A: The CPU is locked (non-K), so official overclocking is not supported. However, some Z170/Z270 motherboards allow base

Product Disclosure (Amazon)

  • Manufacturer: インテル
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B010T6CG7E
  • Note: This article covers a manufacturer-made product based on Amazon listing details.