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Mac Studio vs DGX Spark vs RTX 5090
The Model You Want Decides Which Computer to Buy
15 min readOct 28, 2026
Pick the model before the computer. A Mac Studio, a DGX Spark and an RTX 5090 desktop each run a model only as big as their memory. So the model’s file size decides which of the 3 can run it at all. Among the ones that can, memory speed sets how fast it answers, and price settles the rest.
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TL;DR
- Your model picks the computer: one too big for a computer’s memory crawls there, whatever else that computer does well.
- Among the computers that hold it, memory speed sets the pace, and price decides whether the faster one is worth it.
- The Mac Studio is the buy for models over 32GB: it holds them for less, unless your code must run on NVIDIA servers.
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The Product Page That Sells You the Wrong Computer
You have 3 product pages open and 5,000 to 12,000 dollars to spend, and each page shows a different kind of number. The RTX 5090’s spec table shows speed: its memory moves 1,792 gigabytes a second. NVIDIA’s DGX Spark page headlines compute: a petaFLOP…
