Intel Core i5 8400T 6-core LGA 1150

The Core i5-8400T is a six-core, 35W efficiency champ that's perfect for home servers and quiet builds. It scores 7393 in PassMark multi-core, which is solid for the power draw, but gaming performance is weak at 36.1 out of 100. At $105 in the US or EUR 139 to EUR 205 in Europe, it's a budget-friendly option if you shop around. Buy it for efficiency and always-on workloads, not for gaming.

Let's talk numbers. The PassMark multi-core score comes in at 7393, which lands this chip right around the middle of the pack for multi-threaded work. That's solid for a 35W part, but it's not going to blow anyone away. The single-core score of 1899 is a bit more modest, sitting just below average. What this means in practice is that everyday tasks like web browsing, file transfers, and running a Plex server will feel snappy enough, but heavy single-threaded workloads will show the age of this architecture.

The CPU-Z numbers from a customer review tell a similar story. Single core hits 380, all cores reach 2030. Compare that to the non-T i5-8400 at 470 single and 2680 all-core, and you can see the trade-off clearly. You're giving up roughly 20 to 25 percent raw performance for that lower power envelope. The 9MB of L3 cache helps keep things moving, and DDR4 support up to 128GB means memory won't be your bottleneck. But if you're expecting this to feel like a modern desktop chip, you'll notice the difference in anything latency-sensitive.

The obvious comparison is the non-T i5-8400. Same core count, same cache, but a 65W TDP and noticeably higher clocks. The 8400 scores 470 single-core and 2680 all-core in CPU-Z, versus 380 and 2030 for the T version. If you have the cooling headroom and don't care about power draw, the regular 8400 is the better performer. But if you're building in a tiny case or running 24/7, the T version's efficiency wins out.

Against AMD's Ryzen 7 7800X3D, well, that's not really a fair fight. The 7800X3D is a modern gaming monster with 3D V-Cache, and it costs several times more. The i5-8400T isn't trying to compete there. The Dell Xeon E5-2637 V2 is a more interesting comparison for server use, but it's an older platform with different trade-offs. The Phenom II X6 is ancient history at this point. For the money, the i5-8400T carves out a niche as the efficient budget option that won't heat up your room or your power bill.

Here's where things get interesting. The US listing sits at $105, which is genuinely cheap for a six-core chip with this kind of efficiency. But the European pricing is all over the place. We're seeing EUR 139 to EUR 205 across four listings in Germany, Spain, France, and Italy. That's a EUR 66 spread for the exact same processor. If you're in Europe, shop around. The lower end of that range is a fair deal, the upper end is someone hoping you won't check other stores.

At $105 or EUR 139, this chip makes a lot of sense for the right build. You're getting six cores, a 35W power envelope, and enough performance to run a home server or media box without breaking a sweat. At EUR 205, you're getting into territory where newer, faster options start looking tempting. The affordability percentile of 81 means this is priced well below most CPUs in our database, but that's partly because it's an older tray part with no retail packaging. You're trading polish for price.

The Core i5-8400T is one of those chips that flies under the radar until you realize what it's actually for. It's a 35W TDP part from Intel's 8th gen lineup, which means it sips power while still packing six physical cores. That's a combo you don't see every day, especially at this price point. We're looking at a tray processor here, so no fancy box or stock cooler, just the chip itself. And that's fine, because the people buying this thing usually have a plan.

Who's it for? Home server builders, small form factor enthusiasts, and anyone running a NAS or media box that needs real multi-core grunt without turning their closet into a sauna. The 2.3GHz base clock with a 3.3GHz boost isn't going to set any speed records, but six cores at 35W is a genuinely useful tool. You can stuff this into a tiny case with a passive cooler and forget about it for years.

The interesting bit is the efficiency story. Our database puts this chip at the 78th percentile for efficiency, which is well above average. That's the whole point of the T-series. Intel bins these to run cool and quiet, and the customer reviews back that up. One owner reports all six cores idling around 20 degrees Celsius with a Noctua D9L. That's chilly enough to make a penguin reach for a sweater.

Gamers should absolutely skip this one. The gaming score of 36.1 out of 100 is a clear signal that this chip will hold back any modern graphics card. The low base clock and modest single-thread performance mean you'll see stuttering and frame drops in CPU-intensive titles. If you want to game on a budget, look at a used Ryzen 5 3600 or a non-T i5-8400 instead. You'll get much better frame rates for similar money.

Also skip it if you need strong single-threaded performance for tasks like photo editing, software compilation, or anything latency-sensitive. The single-thread score sits at the 48th percentile, which is below average. And if you're not comfortable with tray processors, meaning no retail box, no stock cooler, and no warranty from Intel, you might want to look at boxed retail chips instead. The tray format is fine for system builders, but it's not for everyone.

If you're building a home server, a NAS, or a quiet always-on machine, the i5-8400T is a genuinely good pick. Six cores at 35W is a sweet spot for that kind of workload. You can run Plex, Nextcloud, a few Docker containers, and still have headroom. The low idle temps mean you can use a cheap cooler or even go passive in the right case. And at $105, it's hard to argue with the price.

But if you're thinking about gaming, stop. The gaming score of 36.1 out of 100 tells you everything you need to know. One customer review put it bluntly, saying the i5-8400T is not suitable for gaming because it only has E3 v3 performance. That's a fair assessment. The low base clock and modest single-thread performance will hold back any modern GPU. For a budget gaming rig, look at a used Ryzen 5 or a non-T Intel chip instead. This processor knows what it is, and gaming isn't it.