Picking your first CPU, GPU and RAM can feel like the hardest part of building a PC, mostly because these three parts decide almost everything else about the build: which motherboard you need, how much cooling matters, and even which case will fit. This guide walks through what each component actually does, how to match them to your budget and use case, and where first-time builders in NZ usually get tripped up.

Why CPU, GPU and RAM Matter Most

Every other part of a PC build, from the motherboard to the power supply, gets chosen around these three components. The CPU (processor) handles general computing tasks and sets which motherboard socket you need. The GPU (graphics card) handles anything visual, from everyday display output to gaming and video rendering. RAM (memory) determines how many programs, browser tabs and background tasks your system can juggle smoothly at once. Get these three right for your budget and use case, and the rest of the build tends to fall into place.

Choosing Your CPU

Start with how many cores and threads you actually need. A budget quad-core CPU is fine for web browsing, office work and light gaming, while content creators, streamers and heavier multitaskers benefit from higher core counts. Intel's current desktop range spans from entry-level Core i3 chips up to Core i7 and i9, all built for the LGA1700 or newer LGA1851 socket depending on generation, so it's worth checking which socket your chosen motherboard supports before buying.

Also check whether the CPU includes integrated graphics or not. Models with an "F" suffix, like the Core i5-14400F, drop the integrated GPU to save on cost, which is a good option if you're already planning to add a discrete graphics card.

Browse the full range in our CPUs & Processors collection.

Choosing Your GPU

If your build is mostly for browsing, office work or everyday streaming, integrated graphics (built into many CPUs) will handle it fine. Once gaming, video editing or 3D work comes into the picture, a dedicated graphics card with its own VRAM makes the biggest difference to performance of any single component.

As a rough guide, 8GB of VRAM is a sensible minimum for 1080p gaming today, with 12GB or more preferred if you're targeting 1440p or higher refresh rates. If you'd rather skip sourcing a card separately, a prebuilt with a dedicated GPU already fitted, tested and warrantied is a solid shortcut for a first system.

See what's currently in stock in our Graphics Cards collection.

Choosing Your RAM

16GB is the realistic minimum for a comfortable Windows experience in 2026, and 32GB is worth the extra spend if you multitask heavily, stream while gaming, or run creative software alongside a browser full of tabs. Always install RAM in matched pairs across dual-channel slots where possible, since dual-channel configurations noticeably improve performance over a single stick of the same total capacity.

Check your motherboard's supported memory type before buying, since DDR4 and DDR5 modules are not interchangeable. Newer LGA1851 and recent AM5 boards use DDR5, which runs at higher speeds (5600MHz and up is common) than DDR4.

Browse options in our RAM & Memory collection.

Quick Comparison: Entry, Mid-range and High-performance Builds

Making Sure Everything Fits Together

A few compatibility checks save a lot of frustration later. Your CPU's socket (LGA1700, LGA1851, or AM5 for AMD) must match your motherboard exactly. Your motherboard's chipset also fixes whether you need DDR4 or DDR5 RAM, so confirm that before ordering memory. If you're adding a full-length discrete GPU, check both the card's length against your case's internal clearance and that your power supply has enough headroom and the right PCIe power connectors.

Cooling is worth planning for too, especially with higher-core CPUs under sustained load. Browse PC Cases and PC Cooling & Fans once you've settled on your core components, and check case dimensions against your chosen GPU length before buying either.

Frequently Asked Questions

What CPU do I need for a first gaming PC build?
A 6-core or higher CPU, such as an Intel Core i5, is a solid starting point for gaming. Pair it with a discrete GPU rather than relying on integrated graphics for anything beyond light or older titles.

How much RAM do I need for gaming and everyday use?
16GB covers most everyday and light gaming use. 32GB is the better choice if you game while streaming, run multiple heavy applications at once, or do creative work alongside gaming.

Do I need a dedicated graphics card for basic tasks?
No. Integrated graphics, built into many current CPUs, handle browsing, office work, and everyday video playback without any extra cost.

Should I choose DDR4 or DDR5 RAM?
This is decided by your motherboard, not personal preference. Check your motherboard's supported memory type first, since DDR4 and DDR5 modules aren't interchangeable.

Ready to Start Your Build?

The short version: match your CPU's socket to your motherboard, pick a GPU sized to your resolution and workload (or start with integrated graphics if you don't need one yet), and don't skimp on RAM if you multitask. Browse our full range of computer components to start putting your build together.