The 128 GB Local AI Cheat Sheet
Every way to get 128 GB, what each one costs, how fast it runs, and what to buy at each budget
For: Anyone pricing a computer to run big open models at home: gaming PC owners, Mac buyers, and anyone weighing a DGX Spark.
Hardware for local AI got a lot more expensive this year. A 64 GB DDR5 kit cost $208 in May 2025 and $1,388 in October 2026, so most buying guides you’ll find are already out of date.
This sheet puts every way to get 128 GB on one page, with US prices from 19 October 2026 and the speeds owners and testers have published:
- What to buy at each budget, from the gaming PC you already own to $10,000 and up.
- Every option side by side: price, memory speed, how fast it writes, and how long it takes to read a 50-page document. Our estimates are marked as estimates.
- How fast is fast: the speed bands, so a number like 20 tokens a second tells you something.
- Six things to know before you buy, from why the same 128 GB can move seven times faster on one box than on another to why the app you run matters as much as the box.
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