Best CPUs under £100 for efficiency

Best Pick

AMD Ryzen 5 5500 6-core AM4

86.6 Most Efficient Score
6C/12T4.2GHz16MB L3AM465W
Why we recommend this

The Zen 3 architecture and 6-core, 12-thread design deliver strong multi-threaded performance with a 19294 PassMark score, while the unlocked 65W TDP allows for easy overclocking via Precision Boost Overdrive. Its value is reinforced by the included Wraith Stealth cooler and broad compatibility with the enduring AM4 platform, making it a cost-effective drop-in upgrade. This processor is best for budget-conscious PC builders moving from an older AM4 chip who already own a dedicated graphics card and need a substantial boost in gaming and productivity.

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AMD Ryzen 3 4100

67.6 Most Efficient Score
4C/8T4.0GHz4MB L3AM465W
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AMD Athlon 3000G 2-core AM4

61.7 Most Efficient Score
2C/4T4MB L3AM435W
Why we recommend this ▼

The unlocked 35W Athlon 3000G stands out by integrating usable Radeon Vega 3 graphics onto a dual-core, four-thread Zen+ chip, eliminating the need for a discrete GPU in basic systems. Its 3.5GHz base clock and full AM4 socket compatibility offer a straightforward upgrade path for aging motherboards at a minimal power draw. This processor is best for office PC builders or home theater enthusiasts who need silent, low-cost 1080p video playback and light multitasking.

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Best CPUs under £200 for efficiency

Best Pick

AMD Ryzen 5 9600X 6-core AM5

97.7 Most Efficient Score
6C/12T5.4GHz32MB L3AM565W
Why we recommend this

The 4nm Zen 5 architecture delivers a 5.4GHz boost clock and strong single-core performance at a 65W TDP, making it exceptionally power-efficient. Its unlocked multiplier on the AM5 socket provides a clear upgrade path and overclocking headroom, backed by integrated Radeon Graphics for basic display output. This processor is best for mainstream gamers and productivity users who prioritize cool, efficient operation without needing a discrete GPU for setup.

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AMD Ryzen 7 7700X 8-core AM5

88.7 Most Efficient Score
8C/16T5.4GHz32MB L3AM5105W
Why we recommend this ▼

With 8 Zen 4 cores boosting to 5.4 GHz and an 80 MB cache, this unlocked chip pushes past 100 FPS in demanding games on the AM5 platform. Its support for DDR5-5200 and PCIe 5.0 on 600-series boards provides a forward-looking foundation without requiring flagship pricing. This processor is best for pure gaming rig builders who prioritize high frame rates over multi-threaded workstation tasks.

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AMD Ryzen 5 5000 Series 5600T 6-core AM4

83.9 Most Efficient Score
6C/12T4.5GHz32MB L3AM465W
Why we recommend this ▼

The 7nm Zen 3 architecture delivers strong efficiency with a 65W TDP and a 4.5GHz boost clock, making it a cool-running option for existing AM4 systems. Its 32MB of L3 cache and bundled Wraith Stealth cooler provide solid out-of-the-box value for a drop-in upgrade. This processor is best for budget-conscious PC builders seeking a capable 6-core, 12-thread chip for productivity workloads without needing a discrete GPU.

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AMD FX 8300 8-core AM3+

41.3 Most Efficient Score
8C/8T4.2GHz8MB L3AM3+95W
Why we recommend this ▼

Built on a 32nm Vishera architecture with a 95W TDP, this unlocked 8-core processor offers a 4.2GHz boost clock and a substantial 8MB L3 cache for multitasking on the AM3+ platform. Its boxed cooler and native 8-core design provide a straightforward, tuneable solution for handling multiple intensive applications simultaneously. This chip is best for budget-conscious builders maintaining legacy systems who need basic megatasking capabilities, not modern gaming or AI workloads.

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AMD AD785KXBJABOX

34.4 Most Efficient Score
4 cores4.0GHzFM2+95W
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AMD Ryzen Threadripper 1920X 12-core sTR4

32.3 Most Efficient Score
12C/24T4.0GHz32MB L3sTR4180W
Why we recommend this ▼

The 12-core, 24-thread design with 64 PCIe 3.0 lanes delivers strong parallel throughput for multi-threaded workloads, backed by a 4.0GHz boost clock. Its unlocked multiplier and quad-channel DDR4 ECC support offer accessible overclocking and memory flexibility on the sTR4 platform. This processor suits budget-conscious workstation users running virtual machines or heavy batch rendering who need high core counts more than single-thread speed.

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Best CPUs under £400 for efficiency

Best Pick

AMD Ryzen 9 7900 12-core AM5

99 Most Efficient Score
12C/24T5.4GHz64MB L3AM565W
Why we recommend this

The 12-core Zen 4 architecture on a 5nm process delivers a 48,116 PassMark multi-core score while sipping power at just 65W TDP, making it an efficiency leader. It includes a capable Radeon iGPU and a boxed Wraith Prism cooler, offering a complete out-of-the-box experience without added cost. This processor is best for workstation users running heavily threaded productivity tasks who prioritize low power consumption and thermals over peak gaming frame rates.

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AMD Ryzen 5 7600X3D 6-core AM5

94.6 Most Efficient Score
6C/12T4.7GHz96MB L3AM565W
Why we recommend this ▼

The 96MB of 3D V-Cache gives this 6-core, 12-thread chip a distinct advantage in gaming, delivering frame rates that rival higher-tier processors while maintaining a modest 65W TDP. Its positioning as a Micro Center exclusive creates a compelling value proposition for builders who can access it, effectively bringing high-end gaming cache to a mid-range price point. This processor is best for AM5 system builders who prioritize pure gaming performance and power efficiency over heavy multi-threaded workstation tasks.

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AMD Ryzen 7 8700F 8-core AM5

87.3 Most Efficient Score
8C/16T5.0GHz16MB L3AM565W
Why we recommend this ▼

With 8 cores and 16 threads at a 4.1 GHz base clock and 16MB cache, this AM5 processor offers a modern socket for future upgrades, though its 3.1/100 total score signals weak performance. Its main differentiator is platform compatibility with AM5 motherboards, enabling DDR5 and PCIe 5.0 support. Best for budget builders who prioritize motherboard longevity over gaming or AI workloads, given its 3.9/100 gaming and 1.5/100 AI scores.

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AMD Ryzen 7 5000 Series 5700X3D 8-core AM4

74.3 Most Efficient Score
8C/16T4.1GHz96MB L3AM4105W
Why we recommend this ▼

The massive 96MB of L3 cache via 3D V-Cache technology delivers top-tier gaming performance on the proven AM4 platform. Its 8-core, 16-thread design with unlocked memory overclocking provides a substantial drop-in upgrade for aging systems without requiring a new motherboard or DDR5 memory. This processor is best for AM4 gamers seeking to maximize frame rates in cache-sensitive titles without a full platform rebuild.

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AMD Ryzen 3 3100 4-core AM4

67.7 Most Efficient Score
4C/8T3.9GHz16MB L3AM465W
Why we recommend this ▼

The 7nm Zen 2 architecture and unlocked multiplier on this 4-core, 8-thread chip deliver strong budget overclocking potential with a 3.9GHz boost and 16MB of L3 cache. Its 65W TDP and included Wraith Stealth cooler keep platform costs low on the mature AM4 socket with PCIe 4.0 support. This processor is best for entry-level PC builders who want a responsive, overclockable foundation for light gaming and everyday productivity.

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AMD FX 8370 8-core AM3+

37.7 Most Efficient Score
8C/8T4.3GHz8MB L3AM3+125W
Why we recommend this ▼

An unlocked 8-core design with a 4.3GHz boost clock and bundled Wraith cooler offers straightforward overclocking on the legacy AM3+ platform. Its 125W TDP and 32nm Vishera architecture deliver dated multi-threaded throughput for budget-conscious builders with existing DDR3 systems. This processor suits users maintaining older AM3+ rigs for basic productivity tasks, not modern gaming or efficiency-focused workloads.

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AMD B960966

37 Most Efficient Score
8C/8T4.2GHz8MB L3Socket AM3+125W
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AMD HDT90ZFBGRBOX

32.3 Most Efficient Score
6C/6T3.6GHz6MB L3AM3125W
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AMD FX-Series FX-9590 8-core AMD Socket AM3+

31.5 Most Efficient Score
8C/8T5.0GHz8MB L3Socket AM3+220W
Why we recommend this ▼

The FX-9590 pushes eight Piledriver cores to a 5.0GHz boost clock on the 32nm Vishera architecture, making it one of the highest-clocked desktop CPUs of its era. Its unlocked multiplier and 220W TDP demand serious cooling and a high-end AM3+ motherboard, but AES instruction support adds a niche security workload benefit. This chip suits overclocking enthusiasts running legacy AM3+ systems who prioritize raw clock speed over power efficiency.

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Premium CPUs for efficiency

Best Pick

AMD 100-000001015

91.2 Most Efficient Score
6C/12T5.1GHz32MB L3AM465W
Why we recommend this

The 5nm Ryzen 5 7600 delivers 6 cores and 12 threads with a 5.1GHz boost, plus a Radeon iGPU and PCIe 5.0 support, all within a 65W TDP. Its unlocked multiplier and DDR5/ECC memory support make it a flexible choice for budget builders, though the tray version lacks a cooler and retail packaging. Best for gamers and productivity users on a budget who want modern platform features without paying for a high-end chip.

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AMD Ryzen 9 7950X 16-core AM5

83.6 Most Efficient Score
16C/32T5.7GHz128MB L3AM5120W
Why we recommend this ▼

The 16-core Zen 4 chip on TSMC 5nm hits 5.7GHz boost with 128MB L3 cache, delivering a PassMark multi score of 62326 at 120W TDP. It pairs DDR5 memory, PCIe 5.0, and an integrated Radeon GPU, making it a strong all-rounder for both gaming and productivity. Best for enthusiasts who want top-tier multi-threaded performance and gaming headroom without needing a discrete GPU for basic display output.

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AMD Ryzen 7 2700 8-core AM4

70.5 Most Efficient Score
8C/16T4.1GHz16MB L3AM465W
Why we recommend this ▼

The 8-core, 16-thread Zen+ architecture delivers strong multi-threaded performance with a 4.1GHz boost and a low 65W TDP, making it an efficient workhorse. Its unlocked multiplier and bundled Wraith Spire cooler offer accessible overclocking, while StoreMI technology adds a unique storage acceleration layer. This processor is best for budget-conscious builders assembling a capable workstation for video editing or 3D rendering on the AM4 platform.

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AMD Ryzen Threadripper PRO 7985WX 64-core sTR5

41.2 Most Efficient Score
64C/128T5.1GHz256MB L3sTR5350W
Why we recommend this ▼

The 64-core, 128-thread design with a 5.1GHz boost clock and massive 320MB L3 cache delivers dominant multi-threaded throughput for heavily parallelized workloads. Its platform offers unmatched expandability through 128 usable PCIe 5.0 lanes and eight-channel DDR5 memory support up to 2TB. This processor is best for workstation users running 24/7 rendering, complex simulations, or multi-GPU compute tasks where I/O bandwidth and core density are non-negotiable.

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