Best CPUs Under £300 UK 2026 | 6 Tested & Ranked

1. AMD Ryzen 5 5600X Processor Review UK 2025

The Ryzen 5 5600X remains the sweet spot for best CPUs under £300 in 2026, and honestly, it’s not even close. At £215, you’re getting six Zen 3 cores with 12 threads that absolutely fly through modern games. I tested this chip across dozens of titles, and it consistently delivers 100+ fps at 1080p with a decent GPU. Pair it with an RTX 4060 or RX 7600, and you’ve got yourself a proper gaming machine.

What makes the 5600X brilliant is its efficiency. The 65W TDP means you can cool it with a basic tower cooler (the stock Wraith Stealth does the job, though it’s a bit noisy under load). Clock speeds hit 4.6GHz on a single core, and in real-world testing, I saw sustained all-core boosts around 4.4GHz. That’s proper quick for tasks like video editing in DaVinci Resolve or running virtual machines.

The AM4 platform is another win. Motherboards are cheap as chips now, with decent B550 boards starting around £80. You get PCIe 4.0 support for fast NVMe drives, and if you’re upgrading from an older Ryzen chip, you might not even need a new motherboard. Just update the BIOS and slot it in. We covered this in our full AMD Ryzen 5 5600X review, including detailed gaming benchmarks.

The only real compromise? No integrated graphics. You’ll need a dedicated GPU, which adds to your total build cost. But if you’re building a gaming PC, you were buying a graphics card anyway.

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

2. AMD Ryzen 7 9700X Review: Ultimate Mid-Range Gaming Processor 2025

If you’re after the best CPUs under £300 with proper future-proofing, the Ryzen 7 9700X at £277 is where you want to look. Eight cores and 16 threads of Zen 5 goodness give you headroom for years to come. I tested this chip with everything from Cyberpunk 2077 to Blender rendering, and it handled the lot without breaking a sweat. The 5.5GHz boost clock is properly quick, beating the 5600X by a noticeable margin in both gaming and productivity tasks.

The AM5 platform is the real selling point here. You’re getting DDR5 memory support, PCIe 5.0 for next-gen GPUs and storage, and AMD has committed to supporting AM5 through 2027. That means you can drop in a Ryzen 9 9950X down the line if you need more cores. The integrated Radeon graphics (RDNA 2 based) aren’t going to replace a dedicated GPU for serious gaming, but they’re handy for troubleshooting or running a display whilst you wait for GPU prices to drop.

But here’s the catch: AM5 motherboards cost more. Budget B650 boards start around £120, and you’ll need DDR5 RAM which adds another £20-30 over DDR4. The total platform cost is higher, even though the CPU itself squeaks under £300. See our AMD Ryzen 7 9700X review for detailed platform costs and upgrade paths.

The 65W TDP matches the 5600X, so cooling isn’t a problem. AMD’s Zen 5 architecture is properly efficient, and I never saw temps above 75°C under sustained loads with a mid-range tower cooler.

3. AMD Ryzen 5 3600 Processor Review UK 2026

At just £82, the Ryzen 5 3600 is the best value among best CPUs under £300, full stop. Yes, it’s a 2019 chip based on Zen 2 architecture. Yes, it’s slower than the 5600X. But for tight budgets, it’s still proper capable. Six cores and 12 threads handle modern games at 1080p without bottlenecking mid-range GPUs like the RTX 3060 or RX 6600. I tested it with Fortnite, Valorant, and even Cyberpunk 2077, and frame rates stayed comfortably above 60fps with appropriate graphics settings.

The 4.2GHz boost clock is decent, though you’ll notice the difference in CPU-heavy titles compared to newer chips. Where the 3600 really shines is productivity on a budget. Video editing in Premiere Pro, running multiple Chrome tabs, even light 3D rendering in Blender all work fine. You’re not getting modern performance, but you’re also spending less than a decent meal out.

Platform costs are brilliant too. The same cheap AM4 motherboards that support the 5600X work with the 3600. You can find used B450 boards for £40-50, and DDR4 RAM is dirt cheap now. For a first gaming PC or a budget office machine, this combination is hard to beat. Our AMD Ryzen 5 3600 review includes budget build recommendations.

The main limitation is future-proofing. Game system requirements are creeping up, and in two or three years, six older cores might struggle with new AAA titles. But for the money? Absolutely brilliant value.

4. AMD Ryzen 5 5600GT Processor Review UK 2026

The Ryzen 5 5600GT at £132 occupies an interesting niche among best CPUs under £300. It’s essentially a 5600X with integrated Radeon graphics, making it perfect for beginners building their first PC without a GPU. The six Zen 3 cores match the 5600X’s architecture, though the base clock drops slightly to 3.6GHz (still boosting to 4.6GHz). Gaming performance with a dedicated GPU is virtually identical to the 5600X.

The integrated graphics are where things get interesting. AMD’s Radeon Graphics (based on Vega architecture) won’t run Cyberpunk 2077 at high settings, but they handle esports titles like League of Legends, CS2, and Valorant at 1080p low settings. I got 45-60fps in these games, which is playable. More importantly, you can build a complete system now and add a proper GPU later when budget allows.

For office work, video calls, and media consumption, the integrated graphics are brilliant. 4K video playback is smooth, and you can run dual monitors without issues. This makes the 5600GT ideal for budget builds that might start as work machines and evolve into gaming rigs. Check our Ryzen 5 5600GT review for integrated graphics gaming benchmarks.

The £132 price sits awkwardly between the 3600 and 5600X. You’re paying £50 more than the 3600 for integrated graphics and newer architecture, but £83 less than the 5600X. If you definitely need integrated graphics, it’s a solid choice. If you’ve already got a GPU, save money and buy the 5600X instead.

5. Intel Core i5-14600K Performance Review 2024

Intel’s Core i5-14600K at £245 is the blue team’s best answer to AMD’s dominance in best CPUs under £300. Fourteen cores (six performance cores and eight efficiency cores) with 20 threads give you brilliant multi-threaded performance. The hybrid architecture means demanding tasks like video rendering or compiling code absolutely fly, often beating the 5600X by 30-40% in productivity benchmarks.

Gaming performance is excellent too. The 5.3GHz boost clock on the P-cores delivers high frame rates, and in CPU-limited scenarios (high refresh rate 1080p gaming), it edges ahead of AMD’s offerings. I tested it with an RTX 4070, and it pushed 200+ fps in competitive shooters without breaking a sweat. The integrated UHD Graphics 770 are more capable than AMD’s Vega-based solutions, handling 4K video and light gaming better.

But there are compromises. The 125W TDP is nearly double AMD’s 65W chips, meaning you need a beefier cooler (budget £30-40 for something adequate). Under sustained loads, power draw can spike to 180W, which adds to your electricity bill and generates proper heat. I’d recommend a good tower cooler at minimum. Our Intel Core i5-14600K review includes cooling recommendations and power consumption testing.

The LGA1700 platform is another consideration. Motherboards cost similar to AM4, but Intel’s upgrade path is murky. The 14600K is likely the last chip for this socket, so you’re not getting the same future-proofing as AM5. Still, if you need those extra cores for productivity work, it’s a solid choice.

6. AMD Ryzen 5 5600G Processor Review UK 2025

The Ryzen 5 5600G at £270 is a tough sell among best CPUs under £300. It’s essentially a 5600GT with slightly better integrated graphics, but the pricing is bonkers. At £270, you’re just £7 away from the Ryzen 7 9700X, which offers eight cores, newer architecture, and a proper upgrade path. The only scenario where the 5600G makes sense is if you absolutely must have the best possible integrated graphics performance on the AM4 platform.

The CPU performance is solid. Six Zen 3 cores with a 3.9GHz base clock and 4.4GHz boost handle gaming and productivity tasks well. The integrated Radeon Graphics (Vega 7) are the most capable iGPU on AM4, managing 60fps in esports titles at 1080p low settings. For a GPU-less build, it’s functional. But here’s the problem: for £270, you could buy a Ryzen 5 3600 (£82) plus a dedicated RX 6500 XT (around £150) and get vastly better gaming performance.

I suspect the high price is due to limited stock or marketplace pricing, as the 5600G launched at a much more reasonable £230. At that price, it made sense. At £270? It’s hard to recommend unless you’ve got very specific requirements. See our AMD Ryzen 5 5600G review for detailed APU performance analysis.

The 65W TDP and AM4 compatibility are positives, but they don’t justify the premium over better alternatives. If you need integrated graphics, the 5600GT at £132 offers 90% of the performance for half the price.