Buying guide

Custom vs prebuilt gaming PC: which should you buy?

Neither is always better. Custom wins when you want specific parts and room to upgrade. Prebuilt wins when the spec already suits you and you want it now. Here is how to tell which one you are.

By BuildT, Drumcondra, Dublin. Updated 13 October 2026.

The three ways to buy

Custom build

You know the games you play, or want the machine tuned for them

Every part chosen for your games, screen and budget. Brand, case, cooling and storage are yours to pick, and the spec can be upgraded part by part later.

Built to order, usually 5 to 10 days.

Prebuilt (ready to collect)

You want a finished, tested machine today and the spec already suits you

A complete PC built and tested ahead of time. You see the exact machine and its photos before you pay, and there is no wait for parts.

One of each, so the choice is whatever is on the bench.

Big-brand or catalogue prebuilt

You want the lowest effort and are happy with a fixed spec

Mass-produced machines with a fixed spec. Often fine, but components such as the power supply, memory and motherboard are not always the ones you would choose.

Check what is inside, not just the graphics card on the label.

What actually differs

Parts you can see and choose

With a custom build you decide the graphics card, CPU, power supply, case and cooling. With a mass-produced prebuilt, the headline parts are listed but the supporting parts often are not.

Upgrade path

A good custom build picks a motherboard, power supply and case with room to grow, so a future graphics card or extra storage drops in. Ask any seller which socket, wattage and case size they are using.

Testing and support

Every BuildT machine is stress and thermal tested before it leaves the bench. 1yr labour warranty + manufacturer parts warranties

Time

A prebuilt is ready to collect now. A custom build is made to order, usually 5 to 10 days.

Price

Compare like for like: the same graphics card, CPU, memory, storage and power supply. A cheaper-looking machine often saves money on the parts you cannot see in the headline spec.

Which should you pick?

Pick a custom build if you play specific games, want a particular case or look, or plan to upgrade. Pick a ready-to-collect prebuilt if one on the bench matches what you want. Not sure? Message us your budget and the games you play and we will say which route fits, even if the answer is a prebuilt. See also what a custom gaming PC costs in Ireland.

Common questions

Is a custom gaming PC better than a prebuilt?

Not always. A custom build is better when you want specific parts, a particular look or a clear upgrade path. A prebuilt is better when its spec already suits you and you want it today. The right answer depends on the games you play and how soon you need the machine.

Is a custom PC more expensive than a prebuilt?

It depends on what you compare. For the same parts, the difference is usually small. Check the power supply, motherboard, memory and storage in both, as these are where cheaper machines often cut back. We give a fixed quote in writing before any work starts.

Can I upgrade a prebuilt gaming PC later?

Often yes, but check the power supply wattage, motherboard and case size first. Some mass-produced machines use non-standard parts that limit upgrades.

How long does a custom build take?

Usually 5 to 10 days from order to collection, depending on parts availability. Prebuilt machines are ready now.

Still deciding?

Tell us what you play.

Give us your budget and the games you play. We reply within a day and tell you plainly whether custom or prebuilt suits you.

Open the configurator → See prebuilt PCs →