The Best PC Components & Upgrades
The top-rated pc components and upgrades on Amazon UK right now: ARCTIC MX-7 (best overall), MSI MAG A650BN Gaming Power Supply Unit: (runner-up), Epson 405 Suitcase Genuine Multipack (best value). All are ranked by genuine customer ratings and review volume, with live Amazon prices.
Some of the highest-impact PC upgrades are also the cheapest. A tube of quality thermal paste can drop CPU temperatures noticeably for a few pounds, and extra storage keeps a system from filling up. These are the small, well-reviewed parts that enthusiasts rebuy, so buy on proven performance and reviews, and match any component to your exact hardware before ordering.
How often this category is on offer: we record Amazon's price once a day. Of the 40 products here with at least two weeks of checks since 4 Sept, 2 showed a discount of 10% or more at every check, 23 never did, and 15 dipped in and out. How we count this
📖 New to components & replacement parts? Read our guides
Top Components & Replacement Parts products
42 products 
Frequently asked questions
Which thermal paste should I buy?
Well-reviewed pastes like ARCTIC MX-4 and Thermal Grizzly Kryonaut are the enthusiast favourites, offering excellent cooling and easy application at a low price. MX-4 is a great non-conductive all-rounder, while Kryonaut targets the lowest temperatures for high-performance or overclocked systems.
How often should I replace thermal paste?
For most PCs, every few years is plenty, or whenever you remove the cooler or notice rising temperatures. A fresh application can meaningfully lower CPU temperatures if the old paste has dried out, and a single small tube is enough for several applications.
Is it worth upgrading PC components yourself?
For simple upgrades like adding storage, reapplying thermal paste or adding RAM, yes. They are inexpensive, well documented online, and deliver a real improvement for little money. Always check compatibility with your specific motherboard and system before buying any component.