Best CPU Under £100
The processors you can buy new for £100 or less, ranked by estimated performance. Each price is the cheapest in-stock price we found among the UK shops we check, as of 21 October 2026. Delivery is extra at some shops.
Most performance per pound on this list: AMD Ryzen 5 4500 CPU Six Core 3.6GHz Processor Socket AM4 - Retail, 4.92 points per £10 at £64.99.
- 1
AMD Ryzen 5 5500F Six Core Socket AM4 4.4GHz Processor - Retail
Estimated score 34 of 100, 3.82 per £10
£88.99 at Scan; also AWD-IT £89.99, Novatech £89.99
- 2
AMD Ryzen 5 5500 CPU Six Core 3.6GHz Processor Socket AM4 - Retail
Estimated score 33 of 100, 4.13 per £10
£79.99 at Scan; also CCL Computers £79.99, Novatech £83.99, AWD-IT £87.99
- 3
AMD Ryzen 5 4500 CPU Six Core 3.6GHz Processor Socket AM4 - Retail
Estimated score 32 of 100, 4.92 per £10
£64.99 at AWD-IT; also Scan £67.99, Box £67.99, CCL Computers £67.99 and 1 more
- 4
Intel Core i3-14100F Raptor Lake Refresh 4 Core LGA 1700 Processor - Retail
Estimated score 26 of 100, 2.92 per £10
£88.99 at Novatech; also CCL Computers £89.99, Overclockers UK £89.99, AWD-IT £94.99
- 5
Intel Core i3-12100F
Estimated score 24 of 100, 2.67 per £10
£89.99 at CCL Computers; also Overclockers UK £89.99
- 6
AMD Ryzen 3 4100 CPU Quad Core 3.8GHz Processor Socket AM4 - Retail
Estimated score 22 of 100, 4.23 per £10
£51.98 at Box; also AWD-IT £51.99, Scan £59.99, Overclockers UK £59.99
How we rank
Highest estimated performance score first, the cheaper processor winning a tie. The score is worked out from core count and boost clock, with a small allowance for L3 cache; it is an estimate from specifications, not a benchmark we ran, and it tops out at 100, so several fast processors can share that score.
Only processors with a photo, a full spec table and a new, in-stock price read in the last two weeks are considered, so a part that is sold out everywhere drops off until a shop has it again. Refurbished and used stock is left out. Prices change through the day: check the shop before you buy. We may earn commission when you buy through a link on a product page; it never changes the order here.