Hardware pick

DDR5 RAM Upgrade Kit (32GB)

The single biggest lever on a CPU-only setup, and still worth getting right on a GPU build - what to check before buying a kit.

Typical price: $375-475+ (see note on pricing below)

Why RAM matters more here than on a normal PC

On a CPU-only setup like the mini PC, system RAM isn't just for the OS and background apps - it's the actual memory a model loads into and runs from. There's no separate VRAM to fall back on, so RAM is the real ceiling on what size model you can run at all, not just how fast it runs.

On a GPU build, the model itself lives in VRAM, not system RAM - see Building a Full PC for Local AI for that math. But system RAM still matters there too: it's what Ollama and everything else running on the machine uses, and running short causes the same kind of slowdown-from-swapping problem, just for a different reason.

Check before you buy, if you already own a mini PC. A meaningful number of mini PCs ship with RAM soldered directly to the board - not a slot you can open and upgrade. If you bought a mini PC expecting to add RAM later, look up your exact model's specs first. This kit is for machines that actually support it, and for full PC builds, where standard DIMM slots are the norm.

What to check before buying a kit

DDR generation - DDR5 and DDR4 are not interchangeable and don't fit the same slots. Check your motherboard or mini PC's exact spec before ordering
Speed and CL timing - match what your motherboard actually supports; buying faster RAM than your board can run doesn't help, it just runs at the board's ceiling
32GB is the practical baseline this site recommends, whether that's a single 32GB kit or two 16GB sticks in dual-channel - check which your specific board/mini PC expects

Where 32GB stops mattering: once a CPU-only setup has enough RAM to comfortably hold a 7-8B model, and a GPU build has enough system RAM to run smoothly alongside VRAM, more RAM doesn't meaningfully speed up inference. Don't overspend chasing a number past the point it's actually solving anything.

A heads-up on price, not just spec: DDR5 is in the middle of a real, well-documented shortage as of 2026 - the same 32GB kit that cost $80-100 in mid-2025 is running $375-475+ now, driven by AI data centers buying up memory supply. This isn't a markup on this specific link; it's the actual current market. If your setup already has enough RAM, this is a good year to leave it alone rather than upgrade for the sake of it.

I don't pin this to one specific kit - DDR5 pricing and available speeds shift constantly, and the exact kit that fits your board depends on your specific motherboard or mini PC model. This search link goes straight to current 32GB DDR5 kits on Amazon:

See current DDR5 RAM kits on Amazon →

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