Best CPUs under £400 for server

Best Pick

Intel Core Ultra 7 270K Plus 24-core LGA1851

84 Servers Score
24C/24T5.5GHz36MB L3LGA1851125W
Why we recommend this

The 24-core Arrow Lake Refresh architecture on a 3nm process delivers a 64,360 PassMark multi-core score, making it a standout for heavily threaded workloads. Its unlocked multiplier and support for PCIe 5.0 and DDR5 memory on the new LGA1851 socket provide a strong foundation for future upgrades. This processor is best for AI/LLM developers and productivity users who need high parallel processing power but don't prioritize top-tier gaming frame rates.

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Intel Core i7 14700K 20-core LGA1700

81.1 Servers Score
20C/28T5.6GHz33MB L3LGA1700125W
Why we recommend this ▼

The 20-core hybrid architecture with 8 P-cores boosting to 5.6GHz delivers a 51,966 PassMark multi-core score, making it a strong upgrade for mixed workloads on the LGA1700 platform. Its unlocked multiplier and broad DDR5/DDR4 support offer flexible overclocking and platform compatibility across 600 and 700 series chipsets. This processor is best for gamers and streamers who need high frame rates alongside multi-threaded productivity like video rendering.

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Intel ULTRA 5 250K

80.9 Servers Score
18C/18T5.3GHz30MB L3LGA 1851125W
Why we recommend this ▼

The 3nm Arrow Lake Refresh architecture and 18-core hybrid design deliver a 37,558 PassMark multi-core score, making it a strong productivity engine with PCIe 5.0 and DDR5 support. Its unlocked multiplier on the LGA 1851 socket provides straightforward overclocking headroom, while the 30MB L2 cache reduces latency in cache-sensitive workloads. This processor is best for AI developers and multitasking professionals who need high parallel throughput but do not rely on discrete-level integrated graphics.

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Intel BX8071513900F

79.8 Servers Score
24C/32T5.6GHz36MB L3LGA170065W
Why we recommend this ▼

The 24-core Raptor Lake-S chip with 32 threads and a 5.6GHz boost delivers strong multi-threaded performance, scoring 48246 in PassMark, while its 65W base power keeps efficiency high. It lacks an iGPU, so a discrete graphics card is required, but it supports both DDR5 and DDR4 memory and PCIe 5.0. Best for budget-conscious productivity users who need heavy multi-core work without integrated graphics.

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Intel Core i5 14600KF 14-core LGA1700

77.9 Servers Score
14C/20T5.3GHz24MB L3LGA 1700125W
Why we recommend this ▼

The 14-core hybrid architecture with a 5.3GHz boost clock and unlocked multiplier delivers strong gaming and multi-threaded performance on the LGA 1700 platform. Its support for both DDR4 and DDR5 memory provides flexible build options without forcing a costly RAM upgrade. This processor is best for budget-conscious gamers and streamers who pair it with a discrete GPU and want high frame rates without overspending.

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Intel Xeon Gold 6132

74.8 Servers Score
16C/32T3.4GHz64MB L3LGA 3647140W
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Intel LF80537GF0484M

69.5 Servers Score
2C/12T4.3GHz16MB L3Socket 47865W
Why we recommend this ▼

The 2.16GHz Core 2 Duo T7400 pairs dual cores with 4MB L2 cache and a 667MHz FSB, a dated but functional pairing for legacy Socket 478 boards. Its 65W TDP and tray packaging make it a low-cost drop-in upgrade for older desktops, though it lacks modern features like DDR5 or PCIe 5.0. Best for hobbyists maintaining vintage systems who need a cheap, reliable CPU for basic office tasks or retro computing.

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Intel BX8071514100F

68.8 Servers Score
4C/8T4.7GHz12MB L3LGA170058W
Why we recommend this ▼

The 4-core, 8-thread Raptor Lake chip boosts to 4.7GHz with a 58W base power, delivering solid everyday performance without integrated graphics. It supports both DDR5 and DDR4 memory plus PCIe 5.0, giving budget builders flexibility in component choice. Best for office workers and casual gamers who already own a discrete GPU and want a low-cost, efficient upgrade for web browsing and light productivity.

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Intel Xeon Silver 4110 8-core FCLGA3647

60.3 Servers Score
8C/16T3.0GHz11MB L3FCLGA364785W
Why we recommend this ▼

Built on a 7nm process with 8 cores and 16 threads, this Xeon Silver processor delivers reliable server performance with a 3.0GHz boost clock and support for up to 768GB of ECC DDR4 memory. Its 85W TDP and PCIe 4.0 connectivity provide a balanced foundation for midsized data center deployments without excessive power draw. This chip is best for IT administrators managing network, storage, and compute tasks in growing organizations.

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Intel BX80673I99900X

56.2 Servers Score
10C/20T4.4GHz19.25MB L3LGA 2066165W
Why we recommend this ▼

The 10-core, 20-thread Skylake X chip hits a 4.4 GHz boost and 19.25 MB cache, with quad-channel DDR4-2666 support and a 165W TDP on LGA 2066. It is unlocked for overclocking and supports Intel Optane Memory, but only works with X299 motherboards. Best for enthusiasts building a high-core-count workstation for rendering or video editing who already own or plan to buy an X299 platform.

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Intel Xeon W 2225 4-core LGA2066

55.7 Servers Score
4C/8T4.6GHz8.25MB L3LGA 2066105W
Why we recommend this ▼

The 4-core, 8-thread Xeon W-2225 delivers a 4.6GHz boost clock and ECC memory support on the LGA 2066 socket, making it a stable entry-level workstation chip. Its 105W TDP and 14nm architecture provide reliable, validated performance for single-socket server boards. This processor is best for IT administrators building a basic file server or running light, mission-critical applications that require error-correcting memory.

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Intel Core i7 X-Series 7800X 6-core LGA2066

55.3 Servers Score
6C/12T4.0GHz8.25MB L3LGA 2066140W
Why we recommend this ▼

The 6-core, 12-thread Skylake-X architecture on the LGA 2066 socket provides 28 PCI Express lanes and Intel Optane Memory readiness, making it a capable platform for high-bandwidth storage and multi-GPU setups. Its positioning on the X299 chipset offers quad-channel DDR4 memory support, which was a differentiator for memory-intensive tasks at its release. This processor is best for budget-conscious system builders seeking a used entry point into the HEDT platform for older rendering workstations or multi-card configurations, not modern gaming or AI workloads.

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Intel BX80634E52470V2

47.7 Servers Score
10C/20T3.2GHz25MB L3LGA 135695W
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Intel CD8067303561900

45.9 Servers Score
8C/8T3.4GHz11MB L3LGA 364785W
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Intel INTBX80715G6900

41.1 Servers Score
2C/2T3.4GHz4MB L3LGA170046W
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Intel Core i5 X-Series 7640X 4-core LGA2066

38.8 Servers Score
4C/4T4.2GHz6MB L3LGA 2066112W
Why we recommend this ▼

The unlocked 4.0GHz base clock and LGA 2066 socket on the Kaby Lake-X chip provide a direct entry point to the X299 platform’s overclocking headroom and quad-channel memory potential. Its single-core PassMark score of 2541 delivers competent VR-ready performance when paired with a discrete GPU, though the 112W TDP and lack of included cooler demand robust aftermarket cooling. This processor is best for budget-conscious system builders who prioritize future scalability to higher core-count X-Series CPUs over immediate multi-threaded productivity.

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Best CPUs under £1,000 for server

Best Pick

Intel Core Ultra 9 285K 24-core LGA1851

84.2 Servers Score
24C/24T5.7GHz36MB L3LGA 1851125W
Why we recommend this

The 24-core, 5.7GHz Intel Core Ultra 9 285K combines eight performance and sixteen efficiency cores on the 3nm Arrow Lake-S architecture with a dedicated 13 TOPS NPU for local AI acceleration. Its unlocked multiplier, PCIe 5.0 support, and 125W base power target enthusiast overclocking and high-bandwidth workflows on the new LGA 1851 platform. This processor is best for content creators and gamers who need top-tier multi-threaded productivity and AI-enhanced tasks without stepping up to a workstation-class chip.

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Intel Core i9 14900KS 24-core Intel Socket 1700

81.2 Servers Score
24C/32T6.2GHz36MB L3LGA 1700150W
Why we recommend this ▼

A 5.9GHz boost clock across 24 cores and Thermal Velocity Boost deliver the highest single-threaded speed available on the LGA 1700 socket for latency-sensitive tasks. Its unlocked multiplier and support for both DDR4 and DDR5 memory offer flexible overclocking headroom without forcing a full platform rebuild. This processor is best for extreme overclockers and single-threaded application users who prioritize peak frequency over multi-core efficiency.

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Intel Core i7 13700K 16-core LGA1700

79.3 Servers Score
16C/24T5.4GHz30MB L3LGA 1700125W
Why we recommend this ▼

The hybrid 8 P-core and 8 E-core design with a 5.4GHz boost clock delivers strong multi-threaded throughput, evidenced by a 45,759 PassMark score, while the unlocked multiplier allows for overclocking. Its 30MB of L3 and 24MB of L2 cache significantly reduce latency in complex workloads, and the integrated UHD Graphics 770 provides display functionality without a discrete GPU. This processor is best for content creators and productivity users who need high core counts for rendering and multitasking but can accept mid-range gaming performance.

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Intel 6821889

67.2 Servers Score
6C/12T4.8GHz12MB L3LGA1465W
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Intel Core i5 12600 6-core LGA1700

67 Servers Score
6C/12T4.8GHz18MB L3LGA170065W
Why we recommend this ▼

The hybrid 6-core, 12-thread Alder Lake architecture delivers strong productivity at a 65W base power, with a 4.8GHz boost and 18MB of L3 cache driving a 21,382 PassMark score. It includes a capable Intel UHD Graphics 770 iGPU and a boxed Laminar RM1 cooler, offering a complete, cost-effective platform with PCIe 5.0 support. This processor is best for budget-conscious PC builders needing reliable performance for office multitasking, light content creation, and home server duties.

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Intel CM8068403654221

55.9 Servers Score
4C/8T4.7GHz8MB L3LGA 115171W
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Intel Core i7 X-Series 7820X 8-core LGA2066

53.6 Servers Score
8C/16T4.3GHz11MB L3LGA 2066140W
Why we recommend this ▼

The 8-core, 16-thread design with a 4.3GHz boost clock and quad-channel DDR4-2666 memory support provides strong multi-threaded throughput for its era. Its unlocked multiplier on the LGA 2066 socket allows for overclocking headroom, paired with a high 4.7-star refurbished rating that signals reliable used availability. This processor is best for budget-conscious builders upgrading an X299 system for moderate 1080p gaming and threaded productivity tasks.

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Intel CM8067702870650

52.9 Servers Score
4C/8T3.9GHz8MB L3LGA115172W
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Intel BX80619I73960X

43.9 Servers Score
6C/12T3.9GHz15MB L3LGA 2011130W
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BX80646I34350

32.5 Servers Score
2C/4T3.6GHz4MB L3LGA 115054W
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Best CPUs under £2,500 for server

Best Pick

Intel Xeon Gold 6526Y 16-core LGA4677

85 Servers Score
16C/32T3.9GHz37.5MB L3LGA 4677195W
Why we recommend this

With 16 cores and 32 threads reaching a 3.9GHz boost, this Xeon Gold processor delivers consistent throughput for multi-threaded server tasks, backed by a substantial 37.5MB L3 cache. Support for up to 4TB of DDR5 memory and PCIe 5.0 connectivity ensures it can handle dense virtualization and memory-intensive workloads without bottlenecking. This chip is best for data center operators running large-scale database and containerized application servers.

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Intel Xeon w5-2455X 12-core LGA4677

71.4 Servers Score
12C/24T4.6GHz30MB L3LGA 4677200W
Why we recommend this ▼

The unlocked 12-core, 24-thread design with a 4.6GHz boost clock on the Sapphire Rapids architecture provides strong single and multi-threaded throughput for workstation tasks. Support for 4-channel DDR5 ECC memory up to 2TB and PCIe 5.0 ensures data integrity and high-bandwidth connectivity for professional environments. This processor is best for entry-level workstation users running 3D rendering or simulation software who require platform stability over peak gaming performance.

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Intel CD8069504393600

66 Servers Score
10C/20T4.7GHz19.25MB L3LGA 2066165W
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Intel Xeon Silver 4215R 8-core LGA1156

50.1 Servers Score
8C/16T4.0GHz11MB L3LGA 1156130W
Why we recommend this ▼

The 8-core Cascade Lake architecture delivers a 3.2GHz base clock and 130W TDP, providing stable multi-threaded throughput for entry-level server deployments. Its 11MB L3 cache and dual-socket scalability offer a cost-effective path for memory-intensive virtualization tasks. This processor is best for IT administrators building basic file servers or running lightweight virtualized environments on a budget.

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