We have not tested these products. This comparison is reasoned from manufacturer specifications, documentation and warranty terms. How we test
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Upgrading well means finding the one component that is actually limiting you, which is usually not the one that feels old.
Measure before you buy
Run the thing that feels slow and watch utilisation while it happens. The component sitting near its limit is your constraint; the ones idling are not, whatever their age.
This takes ten minutes and routinely redirects an upgrade budget from the component someone assumed was the problem to the one that was.
The usual order, by value
A solid-state drive, if the machine still boots from a mechanical disk. This is the largest perceived improvement available for the money, and it is not close.
More memory, if the machine stutters and pauses rather than being uniformly slow. Cheap, and it fixes a symptom people routinely blame on the processor.
The graphics card, if games are the complaint and the card is the busy component.
The processor, last, and only if measurement points at it. It is the upgrade most likely to turn into a new board and new memory as well.
When to stop upgrading
When the next upgrade requires a new board and new memory as well, you are not upgrading, you are rebuilding one part at a time and paying more for the privilege. At that point plan a build instead. Short of that point, our roundup of the best upgrade parts for an old PC covers the individual components worth buying.
How we reached this
This ordering rests on where each component sits in the chain of work a machine does and on the observable symptoms of each bottleneck. No measurement campaign was run here.
Free tool PC Build Compatibility Checker — Will your GPU, PSU, cooler and case actually fit together?Questions people ask
How do I find out what is holding my machine back?
Watch utilisation while you do the thing that feels slow, rather than guessing from the specification sheet. If the graphics card sits near full utilisation and the processor does not, the card is your limit and upgrading anything else changes nothing. If the processor is pinned and the card is idling, the reverse. If neither is busy but the machine still stutters, you are almost certainly short of memory or waiting on a slow drive, which are the two cheapest problems to fix.
Is it worth upgrading a very old machine?
It depends entirely on the socket and the memory generation, because those are what decide whether an upgrade is a component purchase or a rebuild in instalments. If the platform can take a meaningfully faster processor and the memory is a generation that is still sold, targeted upgrades are excellent value. If a faster processor also requires a new board and new memory, you are building a new machine and should plan it as one rather than discovering it halfway through.
Will a new graphics card work in an old machine?
Usually, with three things to verify first. The power supply needs the capacity and the specific connectors the card requires, and an ageing supply deserves scrutiny even if its rating looks adequate. The case needs the physical length and slot clearance. And the processor needs to be fast enough not to hold the card back, which is a real effect at lower resolutions: pairing a current card with a very old processor produces less improvement than the card is capable of.