Free PC building tools

Planning a new PC? Start in the Gaming PC Builder — pick a preset near your budget, then swap parts with live compatibility checks and current UK pricing. Before you commit, run your chosen CPU and graphics card through the FPS Calculator to see the frame rates you can expect in the games you actually play, and through the PSU Calculator to size the power supply properly. An underpowered PSU is the most common mistake we see on the bench — and the cheapest one to avoid.

Upgrading the PC you already own? Go straight to the Bottleneck Calculator. It shows whether your CPU or your graphics card is holding you back in each game, and simulates both upgrades so you can see which one genuinely buys you more frames before spending anything. Then let the Upgrade Advisor turn that into a ranked plan for your budget — it prices motherboard and RAM changes in automatically. Use the CPU database and GPU database to shortlist the replacement — and remember we buy your old parts, which takes a decent chunk off the upgrade cost.

Already got the machine sorted? Grab our technician-approved free software toolkit — the same diagnostics we use in the workshop — to monitor temperatures, check clock speeds and keep everything healthy. Every tool on this page is free, works in your browser, and is maintained by the same TechSavant technicians who build and repair PCs in Harrow every day. If a result surprises you, message us — we’ll tell you what it means and what we’d honestly do in your position.