Upgrade calculator

Work out which component to replace first in a machine that is not keeping up. The planner suggests an order based on what you describe, and explains the reasoning so you can disagree with it where you know more than it does.

Measure before you buy

The single most useful thing you can do before an upgrade costs nothing. Open your operating system task manager, or a monitoring tool, and run whatever feels slow while watching which resource hits its limit first.

If memory is full and the system is writing to disk, more memory is your answer. If the graphics card sits at or near 100 percent utilisation while gaming, the card is the limit. If the card sits well below that while the processor is pinned, the processor is the limit and a new card will disappoint you.

This measurement is worth more than any general recommendation, including the one this tool just gave you. It looks at your actual machine running your actual workload.

Why a solid state drive comes first on older machines

On any machine still booting from a mechanical hard drive, replacing that drive is the upgrade that changes the experience most, regardless of what else is in the machine.

The reason is that most of what feels like slowness on an older PC is waiting for a disk. Start-up, application launches, file browsing and updates are all dominated by the time a mechanical drive takes to find data. Moving to any solid state drive removes that wait. A faster processor does nothing for it.

The bottleneck question

People worry about whether a processor will “bottleneck” a graphics card, usually framed as a yes-or-no question. It is not one.

Every system is limited by something, and which component that is changes with what you are doing. At 4K the graphics card does far more work per frame, so the processor matters less. At 1080p the same pairing shifts the limit towards the processor. The same two components can be perfectly balanced for one game and badly matched for another.

The useful question is not “will this bottleneck” but “at the resolution and settings I actually use, which component reaches its limit first, and how much does that cost me”. That is measurable on your own machine in about five minutes.

When to stop upgrading

On a machine more than about five years old, a processor upgrade usually means a new motherboard and new memory too, because sockets and memory generations have moved on. At that point you are buying most of a new computer and reusing a case and a power supply.

That is worth knowing before you start, because the incremental path can cost more in total than a clean replacement while delivering less. Storage and memory upgrades on an old machine remain excellent value. Processor upgrades on an old platform frequently are not.

Check compatibility before ordering

Three things catch people upgrading an existing machine. A graphics card that is longer than the case allows. A power supply without the connectors the new card needs, or without the capacity. And a processor that the motherboard will not start without a firmware update, which may require a working processor to apply.

Selecting your existing parts alongside the intended new one in the PC Builder checks all three.