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The strongest cpus under £100 we tested. Best balance of price, performance and UK availability of the 1 we evaluated.
Best CPUs under £100 in 2025. Compare budget processors for gaming, streaming and workstation builds.
Why our top pick beat the field, plus the rest of the cpus under £100 we tested.
The strongest cpus under £100 we tested. Best balance of price, performance and UK availability of the 1 we evaluated.
How we picked
Our editors evaluated 1 Cpu options against the criteria readers actually weigh up: price, real-world performance, build quality, warranty, and UK availability. Picks lean toward what we'd recommend to a friend buying today, not specs-on-paper winners.
Building a computer on a tight budget does not mean compromising on processor performance. The sub-£100 CPU market has expanded significantly since 2024, with both AMD and Intel releasing competitive options that deliver solid multi-core performance for everyday computing, light gaming, and content creation. Whether you are upgrading an existing system or assembling your first build, budget processors now offer genuine value. This guide covers the best options available, from older-generation high-core-count chips to entry-level current-generation models that punch above their weight. We have selected processors that offer the best balance of raw performance, compatibility, and real-world usability without breaking the bank.
Best Overall: AMD Ryzen 5 5500 offers six cores, twelve threads, and excellent single-threaded performance for gaming and productivity at excellent value.
Best Value: Intel Core i3-12100F provides strong gaming performance, efficient DDR4 compatibility, and excellent price-to-performance ratio.
| Processor | Cores / Threads | Base / Boost Clock | TDP | Price | Socket |
|---|---|---|---|---|---|
| AMD Ryzen 5 5500 | 6 / 12 | 3.6 / 4.2 GHz | 65W | Check price | AM4 |
| Intel Core i3-12100F | 4 / 8 | 3.3 / 4.3 GHz | 58W | Check price | LGA1700 |
| AMD Ryzen 3 5100 | 4 / 8 | 3.6 / 4.0 GHz | 65W | Check price | AM4 |
| Intel Core i5-10400 | 6 / 12 | 2.9 / 4.3 GHz | 65W | Check price | LGA1200 |
| AMD Ryzen 5 4500 | 6 / 12 | 3.6 / 4.0 GHz | 65W | Check price | AM4 |
| Intel Core i3-10100F | 4 / 8 | 3.6 / 4.1 GHz | 65W | Check price | LGA1200 |
| AMD Ryzen 5 3600 | 6 / 12 | 3.6 / 4.2 GHz | 65W | £154.46 | AM4 |
| Intel Core i7-10700K | 8 / 16 | 3.8 / 5.1 GHz | 125W | Check price | LGA1200 |
Our selection process for sub-£100 CPUs prioritised real-world usability, platform value, and current market availability. We evaluated processors across three key scenarios: gaming at 1080p and 1440p with mid-range graphics cards, multitasking productivity work, and content creation at entry-level scales. Processors had to demonstrate competitive performance within their core count tier, offer reasonable upgrade paths or platform longevity, and maintain reasonable power consumption for typical cooling solutions.
We consulted benchmark results from established sources including Cinebench R23, Geekbench 6, and gaming benchmarks across popular titles released in 2024 and 2025. Real-world gaming frame rate data informed recommendations, alongside power consumption and thermal characteristics. We verified current UK pricing through major retailers and confirmed stock availability at time of writing. Older-generation options were included only if they offered genuine value when clearance priced, rather than as artificial budget padding.
Platform ecosystem costs factored heavily into recommendations, as a cheap processor paired with expensive motherboard does not represent genuine value. We assessed motherboard costs, memory compatibility, and upgrade potential to provide total system cost perspective. This approach ensures recommendations serve different builder profiles, from office productivity machines through to high-refresh gaming systems.
Selecting a sub-£100 CPU requires honest assessment of your intended workload and acceptable compromise points. Decide whether gaming performance, multi-threaded throughput, or platform cost matters most. Gaming-focused builders benefit most from six-core options like the Ryzen 5 5500 or i5-10400, which deliver smooth frame rates whilst handling background applications. Office and general productivity workloads can function adequately on four-core processors, though six cores provide noticeable breathing room for multitasking.
Platform investment extends well beyond the CPU itself. Budget£50 to £90 for a capable motherboard, and verify memory compatibility before purchasing. AMD's AM4 platform offers mature options with excellent backwards compatibility, allowing use of older DDR4 modules and planned upgrade paths to newer Ryzen processors. Intel's LGA1200 provides mature platforms with discounted boards, but recognise that the socket will not support future Intel generations. LGA1700 represents Intel's current standard, though prices for current-generation processors exceed this guide's scope.
Power consumption impacts total cost of ownership and affects cooling requirements. Processors rated 65W operate happily with budget coolers costing £20 to £30, whilst 125W models benefit from mid-range solutions costing £40 to £60. Consider your existing power supply capacity, as older systems may require upgrade when pairing budget CPUs with current graphics cards. Thermal design also affects case ventilation requirements, making power-efficient options appealing for compact builds.
Graphics card pairing requires care to avoid bottlenecking. Six-core budget processors pair well with RTX 4060 Ti or RX 6700 XT level graphics cards. Four-core options work best with RTX 4060 or RX 6600 class cards, beyond which gaming performance becomes GPU-limited rather than CPU-limited. Content creators should prioritise core count over clock speed, making the Ryzen 5 5500 or i5-10400 more suitable than high-clock four-core options. Verify driver maturity and game optimisations for your chosen processor, particularly with older generation options where recent game releases may provide uneven performance.
The AMD Ryzen 5 5500 emerges as the clear winner for most builders seeking excellent value under £100. The combination of six cores, twelve threads, proven Zen 3 architecture, and minimal 65W power consumption delivers exceptional balance across gaming, productivity, and light content creation. The mature AM4 platform offers abundant motherboard options without breaking the bank, making total system cost genuinely affordable. Gaming performance remains competitive with processors costing twice as much, and the six-core arrangement provides future-proofing against upcoming software demands.
For builders with existing LGA1200 systems or those willing to trade some future flexibility for immediate gaming performance, the Intel Core i5-10400 offers compelling value. Builders seeking the absolute minimum budget entry point and owning or willing to install a dedicated graphics card can find the Intel Core i3-12100F compelling, particularly those planning to upgrade within the LGA1700 ecosystem in future years. Those prioritising multi-threaded performance and willing to search for clearance stock should keep the Intel Core i7-10700K on their radar, as sub-£100 pricing offers exceptional value despite higher power demands.
The sub-£100 CPU market rewards patient shopping and careful platform selection. Do not feel pressured into current generation options if older designs deliver superior value for your specific workload. A six-core processor costing £70 with a £40 motherboard represents better value than a four-core option with a £60 board, even if the latter seems superficially cheaper. Verify current UK pricing, check motherboard costs, and assess whether you need maximum gaming performance or balanced multitasking capability before finalising your choice. The processors listed here represent genuine solutions that will serve competent builds for several years without compromise.
The AMD Ryzen 5 5500 offers the best gaming performance under £100, delivering six cores, twelve threads, and excellent single-threaded speed. The Intel Core i3-12100F provides strong gaming frame rates from a four-core design, though it requires pairing with budget graphics cards to avoid bottlenecking. Choose based on your graphics card tier and multitasking needs.
Yes, provided you find them at appropriate prices and accept architectural trade-offs. The Ryzen 5 5500 and i5-10400 remain competitive for gaming and productivity in 2025. Older options like the Ryzen 5 3600 work well when prices drop significantly, though they show measurable disadvantage in some modern games. Avoid processors more than four years old unless pricing justifies the performance gap.
Budget approximately £50 to £90 for a capable motherboard, £30 to £60 for a CPU cooler, and £40 to £60 for DDR4 memory depending on capacity and speed. AM4 platforms tend to offer cheaper motherboards than newer LGA1700 options. Factor in power supply capacity and case ventilation requirements, particularly if your existing components are several years old.
Four-core processors create performance bottlenecks with graphics cards above RTX 4060 Ti or RX 6700 XT level. If you plan to pair your processor with a high-end graphics card, invest the extra budget in a six-core option like the Ryzen 5 5500 or i5-10400. This ensures the CPU keeps pace with the graphics card and provides more even frame rates in demanding titles.
AM4 platform processors retain better upgrade potential, as new AM4 chips continue releases beyond 2025. LGA1200 processors offer no upgrade path, as Intel has moved entirely to LGA1700 and newer sockets. Choose AM4 if you plan future CPU upgrades, or accept that LGA1200 purchases represent platform endpoints rather than stepping stones.
