Best CPUs under €100 for efficiency

Best Pick

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 €300 for efficiency

Best Pick

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 A Series AD6700OKHLBOX 4-core Socket FM2

57.7 Most Efficient Score
4C/4T4.2GHz8MB L3Socket FM265W
Why we recommend this ▼

Combining four CPU cores with an integrated Radeon HD8670D GPU on the FM2 socket, this unlocked 65W APU supports Dual Graphics for a budget-friendly hybrid setup. Its 4.2GHz base clock and DDR3/DDR4 flexibility up to 64GB provide a straightforward upgrade path for aging systems. This processor suits cost-conscious builders assembling basic home theater PCs or handling light esports titles without a discrete graphics card.

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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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Best CPUs under €500 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 4600G

75.7 Most Efficient Score
6C/12T4.2GHz8MB L3AM465W
Why we recommend this ▼

The 7nm Zen 2 architecture delivers 6 cores and 12 threads with a 4.2 GHz boost, plus integrated Radeon graphics that eliminate the need for a separate GPU in basic builds. Its 65W TDP and unlocked multiplier make it a power-efficient choice for compact systems, while the bundled Wraith Stealth cooler keeps setup costs low. Best for budget-conscious builders assembling entry-level gaming or office PCs who want solid integrated graphics and upgrade headroom on the AM4 platform.

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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 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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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 Ryzen Threadripper PRO 5995WX 64-core sWRX8

61.5 Most Efficient Score
64C/128T4.5GHz256MB L3sWRX8280W
Why we recommend this

The 64-core, 128-thread Zen 3 architecture delivers a 94,945 PassMark score and 256MB of L3 cache, making it a dominant force for heavily threaded workloads. Its 8-channel DDR4 ECC memory support and 128 PCIe 4.0 lanes provide massive expansion and data integrity for professional chassis builds. This processor is best for AI researchers and data scientists running large language models locally who need maximum parallel compute without scaling to a multi-socket server.

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AMD Ryzen Threadripper 9980X 64-core sTR5

41.9 Most Efficient Score
64C/128T5.4GHz256MB L3sTR5350W
Why we recommend this ▼

The 64-core, 128-thread Threadripper 9980X leverages a 4nm process and 5.4GHz boost to deliver a 142,812 PassMark multi-core score for heavy rendering and simulation. Its quad-channel ECC DDR5 support and 88 PCIe 5.0 lanes provide uncompromised memory bandwidth and expansion for multi-GPU setups. This processor is best for AI developers and 3D artists running parallelized workloads who need workstation-class throughput without moving to a server platform.

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AMD B960966

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