Intel Core i5-8400 Buyer's Guide
Positioning and generation
The Intel Core i5-8400 is a desktop processor based on the Coffee Lake architecture, part of the 8th Gen lineup. On our site it sits in the older mainstream band. It is no longer new, but it remains a common choice in older builds.
This is the desktop version with integrated graphics, so it can display an image without a dedicated graphics card. The built-in graphics are limited, though, and demanding games still call for a separate graphics card.
In our ranking it lands between the lower and middle tiers, which makes it a useful reference when deciding whether an older platform can still handle current game requirements.
Key specs explained
The specs we hold for this chip are six cores, six threads, the Coffee Lake architecture, the 8th Gen label, and integrated graphics. Six cores and six threads give it enough parallel capacity for most games. It has no simultaneous multithreading, so heavy multitasking or workloads that need many threads at once will feel tighter.
Integrated graphics save the cost of a graphics card and are fine for office work, video playback, or light gaming. For demanding games, a dedicated graphics card is the better choice, since it removes the limits of the built-in graphics.
Clock speeds, cache sizes and power figures are not specified in our data, so we do not cover them here.
Suitable games and resolutions
Based on official requirements, our catalogue holds 439 games with published requirements, and this processor can be assessed against 416 of them. It meets the recommended requirements for 143 of those games and is well above the recommended level for 166 more. A further 92 games are met at the minimum level only, and 15 fall below the minimum. Overall, it clears the processor requirements for most titles.
Examples that reach the recommended level include Big Ambitions, Microsoft Flight Simulator (2020) 40th Anniversary Edition, Timberborn, Farthest Frontier and Dispatch. Titles met only at the minimum include Scrap Mechanic, Forza Horizon 6 and Fields of Mistria. Games below the minimum include Palworld, Dying Light: The Beast and ELDEN RING NIGHTREIGN, and for those a processor upgrade may be needed.
For resolution, 1080p is the practical target with this chip. Higher resolutions depend mainly on the graphics card, and the processor is rarely the only bottleneck.
Compared with similar hardware
In our ranking it sits alongside the AMD Ryzen 3 3100 and AMD Ryzen 7 1800X, just below the Intel Core i7-7700K. Compared with the slightly lower-tier AMD Ryzen 7 1700X, Intel Core i7-7700 and Intel Core i7-6800K, its position is roughly similar or a little higher.
These comparisons only reflect positions in our ranking, not real gaming gaps. When choosing, base your decision mainly on the official requirements of the games you play and your budget.
Buying new or used
This processor uses the LGA1151 socket and needs a motherboard with a 300-series chipset. Check socket and chipset compatibility before buying, since this is the most common mistake.
The boxed version includes a basic stock cooler; tray units do not. If you buy a tray unit, plan to buy a cooler separately.
This processor uses a land grid design: the pins are in the motherboard socket, so take care not to touch them when installing it.
When buying used, check the chip for physical damage and ask the seller for proof of purchase and warranty status. For new units, buy through a channel that offers a proper warranty.
Upgrade advice
If your current processor can no longer handle the games you want to play, upgrading is often cheaper than replacing the whole system. Candidates to look at include the Intel Core i5-10400, Intel Core i5-10400F and Intel Core i7-8700K, and the i7-8700K sits clearly higher.
Keep the graphics card and memory in balance too. A weak graphics card limits the gain from a faster processor, and too little memory holds back the whole system. Check both before deciding how far to go.