Best AMD CPUs Under £400

1. AMD Ryzen 5 5600X Processor (6 Cores/12Threads, 65W TDP, AM4 Socket, 35MB Cache, up to 4.6 GHz Max Boost, Wraith Stealth Cooler)

Price: £145.00 | Rating: ★★★★½ (4.8)

Here's the thing: when you're hunting the best AMD CPUs under £400, the Ryzen 5 5600X keeps coming up for a reason. It's not the newest chip on this list. It's not the fastest. But it hits a sweet spot that very few processors manage at any price. Six cores, twelve threads, a 4.6 GHz boost clock, and AMD's Zen 3 architecture underneath. That combination still handles modern games brilliantly, and it won't bottleneck a mid-range GPU like an RTX 4070 or RX 7800 XT.

The 35MB of total cache is generous for a chip at this price, and it shows in gaming. Frame times are consistent, 1% lows are solid, and the chip doesn't break a sweat in everyday tasks. Productivity work like video editing and streaming is fine too, though if you're doing heavy rendering regularly, you'd want more cores.

It runs on AM4, which means cheap, mature motherboards are everywhere. You can pair this with a decent B550 board for under £80 and still have money left for RAM and storage. The Wraith Stealth cooler is included, which saves you another £20 to £30. Total platform cost is genuinely low.

The only honest caveat: AM4 is a dead-end platform. There's no upgrade path beyond Ryzen 5000. If you're planning to upgrade your CPU in two or three years, AM5 makes more sense long-term. But if you want the best performance per pound right now on a proven platform, the 5600X is hard to argue with. It's our top pick among the best AMD CPUs under £400 for good reason.

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2. AMD RYZEN ™ 7 9800X 3D Desktop Processor (8-core/16-thread, 104MB cache, up to 5.2 GHz max boost)

Price: £332.49 | Rating: ★★★★½ (4.8)

If gaming is your priority and you have the budget, stop reading here. The Ryzen 7 9800X 3D is the best gaming CPU AMD has ever made, and it sits just under the £400 ceiling. The headline spec is that 104MB of total cache, courtesy of AMD's 3D V-Cache technology. That stacked cache dramatically reduces the latency between the CPU and game data, and the result is measurably better frame rates in CPU-limited scenarios.

Real-world gaming benchmarks put it ahead of everything else on this list in titles like Cyberpunk 2077, Hogwarts Legacy, and Baldur's Gate 3. The 5.2 GHz boost clock is strong, and the Zen 5 architecture underneath is AMD's most efficient yet. Eight cores and sixteen threads also mean it handles streaming, Discord, and background tasks without any drama.

It does need an AM5 platform, so factor in the cost of a 600 or 800-series board and DDR5 RAM. No cooler is included either, which is a bit cheeky at this price. Budget around £30 to £50 for a decent air cooler. But if you're building a proper gaming PC and want the best AMD processor under £400, this is it. No contest.

For context, AMD's own Ryzen desktop processor page positions the 9800X 3D as their flagship gaming chip, and the independent testing at Tom's Hardware backs that up consistently.

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3. AMD Ryzen 7 5800 XT Processor (8 Cores/16 Threads, 105W DTP, AM4 Socket, 36MB Cache, Up to 4.8 GHz max boost frequency, Wraith Prism Cooler)

Price: £206.54 | Rating: ★★★★½ (4.7)

The Ryzen 7 5800 XT is a proper eight-core chip on AM4, and it comes with the Wraith Prism cooler, which is genuinely one of the better stock coolers AMD has ever shipped. RGB lighting, solid copper heatpipes, and enough thermal headroom to keep the 5800 XT comfortable even under sustained load. That cooler alone is worth £40 to £50 if you bought it separately.

Performance-wise, eight Zen 3 cores at up to 4.8 GHz handles gaming, content creation, and multitasking without complaint. It's not quite as fast as the newer AM5 chips in raw single-core performance, but the gap is smaller than you'd expect. For gaming on an existing AM4 platform, this is one of the best upgrades you can make.

The 36MB of cache is solid, and the 105W TDP means it runs a bit warmer than the 65W chips on this list. The included Wraith Prism handles it fine, but if you're planning to overclock, a beefier aftermarket cooler would help. No integrated graphics, so a discrete GPU is required.

If you've already got an AM4 board and want a meaningful upgrade without switching platforms, the 5800 XT is a very strong choice. It earns its Best Build Quality badge partly for that Wraith Prism cooler, but also because the chip itself feels well-sorted and reliable in long-term use.

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4. AMD Ryzen 5 7600 Processor (radeon graphics integrated, 6 cores/12 threads, 65W TDP, AM5 Socket, 38MB cache, up to 5.1 GHz max boost, Wraith Stealth Cooler)

Price: £138.00 | Rating: ★★★★½ (4.8)

The Ryzen 5 7600 is AMD's most affordable AM5 entry point, and it's a proper decent chip. Six cores, twelve threads, a 5.1 GHz boost clock, and integrated Radeon graphics. That last bit matters more than people give it credit for. If your discrete GPU dies or you're building a system before your graphics card arrives, the iGPU keeps you going.

The AM5 platform is the big selling point here. Unlike AM4, AM5 has a longer upgrade runway. You can drop in a Ryzen 9000 series chip down the line without changing your motherboard. That future-proofing has real value when you're budgeting carefully.

Gaming performance is strong for the price. The 5.1 GHz boost and Zen 4 architecture mean it keeps up with more expensive chips in most titles. It won't match the 9800X 3D in CPU-limited games, but paired with a good GPU, you'd struggle to tell the difference in most scenarios.

The Wraith Stealth cooler is included, which is a nice touch. The 38MB of cache is generous. And at this price, it's genuinely hard to find a better AM5 chip. If you're starting a new build and want a future-proof platform without spending a fortune, the Ryzen 5 7600 is a smart pick among the best AMD CPUs under £400.

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5. AMD Ryzen 5 8600G processor (integrated Radeon Graphics, Ryzen AI, 6 cores/12 threads, 65W TDP, AM5 Socket, Cache 22MB, up to 5.0 GHz max boost, with wraith stealth cooler)

Price: £147.00 | Rating: ★★★★½ (4.8)

The Ryzen 5 8600G earns its Best for Beginners badge because it removes the biggest headache in budget PC building: the need for a discrete GPU. The integrated Radeon 760M graphics are the best you'll find in any AM5 APU at this price. Light gaming at 1080p is genuinely possible, esports titles run well, and everyday tasks like video playback and photo editing are handled without breaking a sweat.

Six Zen 4 cores, a 5.0 GHz boost clock, and the Wraith Stealth cooler in the box. It's a complete package. You can build a functional PC with this chip, a B650 board, and 16GB of DDR5 RAM without touching a graphics card. That's a significant saving for someone just getting started.

The 22MB of cache is lower than some rivals, which does affect performance in cache-sensitive workloads. And the integrated graphics, while impressive for an APU, won't compete with even a budget discrete GPU like an RX 6600. But for a first build, a home office machine, or a compact PC that needs to handle light gaming, the 8600G is a genuinely smart choice.

Ryzen AI features are included too, though their practical impact in everyday use is still limited. Think of it as a bonus rather than a headline feature.

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6. AMD Ryzen 7 9700X Processor (8 Cores/16 Threads) 65W DTP, AM5 socket, 40MB Cache, Up to 5.5 GHz max boost frequency, no cooler

Price: £244.99 | Rating: ★★★★½ (4.8)

Eight Zen 5 cores at 5.5 GHz boost, 40MB of cache, and a remarkably low 65W TDP. The Ryzen 7 9700X is a chip that punches well above its thermal weight. AMD managed to squeeze serious performance out of a very efficient power envelope, which means it runs cool, stays quiet, and doesn't demand a beefy cooler to behave itself.

For a mixed-use build covering gaming, productivity, and content creation, the 9700X is one of the most balanced chips on this list. It handles video editing, 3D rendering, and gaming without needing to compromise. The 5.5 GHz boost is the highest on any non-3D chip in this roundup, and it shows in single-threaded workloads.

The catch? No cooler included. At this price, that's a bit disappointing. Budget an extra £30 to £50 for a decent air cooler. And you'll need an AM5 board with DDR5 RAM, so the total platform cost is higher than AM4 alternatives. But if you're building a new system and want a chip that'll stay relevant for years, the 9700X is a proper strong choice.

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7. AMD Ryzensets 9 9900X Processor (radeon graphics integrated, 12 Cores/24 Threads, 120W DTP, AM5 Socket, 76MB Cache, Up to 5.6 GHz max boost frequency, No Cooler)

Price: £299.99 | Rating: ★★★★½ (4.8)

Twelve cores, twenty-four threads, 76MB of cache, and a 5.6 GHz boost clock. The Ryzen 9 9900X is the most powerful chip on this list in terms of raw multi-threaded grunt, and it's the obvious choice if you're doing serious content creation work. Video rendering, 3D modelling, compiling code, running virtual machines. These are the workloads where twelve cores make a real difference.

Gaming performance is strong but not exceptional. The 9800X 3D beats it in games thanks to that 3D V-Cache advantage. For pure gaming, the 9900X is overkill and you'd be better served by a cheaper chip. But if your PC needs to handle both gaming and heavy creative work, the 9900X covers both bases without compromise.

The 120W TDP is the highest on this list. You'll need a decent cooler (not included) and a motherboard with solid VRM cooling. Budget accordingly. Integrated Radeon graphics are present, which is handy for troubleshooting. No cooler in the box is frustrating at this price point, but it's par for the course with high-end Ryzen chips.

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8. AMD Ryzen 5 9600X Processor (radeon graphics included, 6 Cores/12 Threads, 65W TDP, Socket AM5, Cache 38MB, up to 5.4 GHz max boost Frequency, no cooler)

Price: £176.00 | Rating: ★★★★½ (4.8)

The Ryzen 5 9600X is a fast, efficient six-core chip on AM5 with Zen 5 architecture and a 5.4 GHz boost clock. It's genuinely quick in single-threaded tasks and handles gaming well. The 38MB of cache is solid, and the integrated Radeon graphics mean you're not completely stuck if your GPU has a problem.

So why is it ranked eighth? Honestly, the Ryzen 5 7600 undercuts it on price while offering competitive performance. The 9600X is faster, but not dramatically so for most users. And it doesn't include a cooler, which the 7600 does. You're paying a premium for Zen 5 architecture and a slightly higher boost clock, and whether that's worth it depends on your priorities.

If you specifically want the latest Zen 5 architecture in a six-core package and you're building on AM5, the 9600X makes sense. It's a proper chip. But as a value proposition within the best AMD CPUs under £400 category, the 7600 edges it out for most buyers.

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9. AMD Ryzen 5 5600GT processor (integrated Radeon Graphics, 6 cores/12 threads, 65W DTP, AM4 Socket, Cache 19MB, up to 4.6 GHz max boost, with wraith stealth cooler)

Price: £142.99 | Rating: ★★★★½ (4.8)

The Ryzen 5 5600GT is a bit of a hidden gem. It combines the Zen 3 CPU cores of the 5600X with integrated Radeon graphics on AM4. That's a combination that didn't exist for a long time on this platform, and it fills a genuine gap. If you're building or upgrading an AM4 system and can't afford a discrete GPU right now, the 5600GT keeps you going.

The integrated graphics aren't as capable as the 8600G's Radeon 760M, but they're functional. Light gaming at 1080p low settings is possible. Esports titles like Valorant and CS2 run at playable frame rates. It's not a gaming GPU replacement, but it's a proper stopgap.

Six cores, twelve threads, 4.6 GHz boost, and the Wraith Stealth cooler included. The 19MB of cache is lower than the 5600X's 35MB, which does affect performance in some scenarios. But for a GPU-free AM4 build, this is the best option on the list. Ranked ninth because the 5600X is a better pure CPU, but the 5600GT has a specific use case it handles very well.

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10. AMD Ryzen 5 4500 Processor (6 Cores/12 Threads, 65W DTP, AM4 Socket, 11 MB Cache, Up to 4.1 GHz Max Boost, wraith stealth cooler)

Price: £172.94 | Rating: ★★★★½ (4.8)

The Ryzen 5 4500 is a Zen 2 chip, and that matters. It's a generation behind the 5600X in architecture, and the 11MB of cache is noticeably lower than most competitors on this list. In cache-sensitive workloads and games, that gap shows up in benchmarks. It's not a bad chip, but it's hard to recommend when the 5600X exists at a lower price.

The 4.1 GHz boost clock is modest by current standards, and the Zen 2 architecture is starting to show its age in 2026. The Wraith Stealth cooler is included, which helps. And it does work fine for basic tasks, office applications, and light gaming. But within the best AMD CPUs under £400 category, it's outclassed by several cheaper options.

The main scenario where the 4500 makes sense is if you find it at a significant discount or you specifically need an AM4 chip for an older board that won't support Ryzen 5000. Otherwise, spend a little more for the 5600X and don't look back.

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11. AMD Ryzen 5 3600 Processor (6 Cores/12Threads, 65W DTP, AM4 Socket, 35 MB Cache, up to 4.1 GHz Max Boost frequency, Wraith stealth cooler)

Price: £93.99 | Rating: ★★★★½ (4.8)

Look, the Ryzen 5 3600 was a legendary chip when it launched. It genuinely changed what budget PC building looked like. Six cores, twelve threads, 35MB of cache, and a price that made Intel sweat. But that was then. In 2026, the 3600 is a Zen 2 chip that's been overtaken by multiple cheaper alternatives.

The 4.1 GHz boost clock is the same as the Ryzen 5 4500, but the Zen 2 architecture underneath is now two generations old. The 5600X offers Zen 3 architecture, a higher boost clock, and better IPC for less money. There's really no scenario where the 3600 at its current price makes more sense than the 5600X.

It's ranked eleventh because it still works. The Wraith Stealth cooler is included, the 35MB cache is generous, and it'll handle everyday tasks and older games without complaint. But as a recommendation within the best AMD CPUs under £400, it's hard to justify. Only buy this if you find it heavily discounted or you're upgrading a very old AM4 board that won't support Ryzen 5000.

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12. AMD Ryzen 3 3200G processor (Radeon Vega 8 integrated GPU, 4 cores/4 threads, 65W TDP, AM4 socket, 6MB Cache, up to 4.0 GHz max boost frequency, wraith stealth cooler)

Price: £62.47 | Rating: ★★★★½ (4.7)

The Ryzen 3 3200G is the most affordable chip on this list, and it earns its Best Under £100 badge by being the only option here that combines a sub-£100 price with integrated graphics. Four cores, four threads, Radeon Vega 8 graphics, and the Wraith Stealth cooler in the box. For an absolute budget build or a basic home office PC, it gets the job done.

But be honest with yourself about the limitations. Four threads is genuinely restrictive in 2026. Modern browsers, background apps, and even basic multitasking can push a four-thread chip to its limits. Gaming is possible in light titles at low settings, but don't expect smooth performance in anything demanding.

The 6MB of cache is the lowest on this list, and the Zen+ architecture is old. This chip is best suited to a very specific use case: a cheap, functional PC for someone who needs basic computing without spending much. Think media centre, kids' homework machine, or a secondary PC. For anything more demanding, save up for the 5600X or the 5600GT.

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