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For Qwen 3.8 27B, a 16 GB Apple silicon Mac is enough with the Bonsai 2 27B build (7.8 GB), and 32 GB runs the full 4-bit download. Off Grid AI Desktop runs both for free. For DeepSeek V4.1 Flash you need 128 GB for the smallest 1-bit build and 256 GB for 3-bit, which means a Mac Studio or a maxed-out MacBook Pro costing $5,000 to $9,500. Most people should check what their current Mac runs before they buy one.
Download Off Grid AI Desktop for Mac (free, Apple silicon)
The short answer by model
| Model | Mac memory you need | Mac that fits |
|---|---|---|
| Qwen 3.8 27B, Bonsai 2 build (7.8 GB with vision) | 16 GB | Any Apple silicon Mac with 16 GB+ |
| Qwen 3.8 27B, 4-bit (16.5 GB file) | 32 GB | Mac mini, MacBook Pro or Mac Studio with 32 GB+ |
| Qwen 3.8 27B, 8-bit (29 GB file) | 48 to 64 GB | Mac mini M5 Pro or Mac Studio M5 Max |
| DeepSeek V4.1 Flash, 1-bit | 128 GB | MacBook Pro M5 Max or Mac Studio M5 Max, 128 GB |
| DeepSeek V4.1 Flash, 3-bit | 256 GB | Mac Studio M5 Ultra, 256 GB |
| DeepSeek V4.1 Flash, 4-bit | about 300 GB | Mac Studio M5 Ultra, 512 GB |
The Qwen figures are Off Grid AI Desktop’s own fit rule applied to Prism ML’s Bonsai 2 27B and the standard 4-bit download. See how to run Qwen 3.8 27B on your Mac for every size. The DeepSeek figures are from Unsloth’s run guide, which names “256GB RAM setups like a Mac Studio” for 3-bit and 128 GB machines “like a Macbook” for 1-bit. The 48 to 64 GB row for Qwen 8-bit is our estimate from the 29 GB file size plus room for macOS and context.
Why DeepSeek needs so much memory
DeepSeek V4.1 Flash has 552B backbone parameters plus a 196B “Engram” lookup table, per its model card. It’s a mixture-of-experts model that uses only 8B to 16B parameters per token, so it can be quick once loaded. Loading it is the problem.
Unsloth’s guide says the Engram table can stay on your SSD and load on demand. That’s why 128 GB is enough for 1-bit. You still need the disk space, about 233 GB for the 1-bit download and 501 GB for 4-bit (file list).
Unified memory helps here. On Apple silicon the GPU uses the same memory pool as the CPU, so a 128 GB Mac gives the model far more room than a PC with a 32 GB graphics card.
What these Macs cost
Apple’s US prices for the 2026 models, as reported by Daring Fireball and MacRumors, checked 16 November 2026.
| Mac | Unified memory | Price (US) | Runs |
|---|---|---|---|
| Mac mini M6 | 32 GB | about $1,300 | Qwen 3.8 27B, 4-bit |
| Mac mini M5 Pro | 64 GB | about $2,700 | Qwen 3.8 27B, 8-bit |
| Mac Studio M5 Max | 128 GB | about $5,100 | DeepSeek V4.1 Flash, 1-bit |
| MacBook Pro 14” M5 Max | 128 GB | from $3,599 with 36 GB; about $5,100 with 128 GB | DeepSeek V4.1 Flash, 1-bit |
| Mac Studio M5 Ultra | 256 GB | about $9,500 | DeepSeek V4.1 Flash, 3-bit |
| Mac Studio M5 Ultra (36-core) | 512 GB | $22,299 | DeepSeek V4.1 Flash, 4-bit |
Memory can’t be added later on any Mac, so you pick it at checkout. Reports say high-memory Mac Studios have long delivery times. Check Apple’s store for today’s price and ship date.
What can your current Mac run?
Off Grid AI Desktop shows a fit badge on every model in Models, sized to your Mac. Here’s what to expect by memory.
| Your Mac | What to run in Off Grid AI Desktop |
|---|---|
| 8 GB | Small models up to about 4B, such as Qwen 3.5 4B |
| 16 GB | Qwen 3.8 27B as Bonsai 2 27B, or Qwen 3.5 9B |
| 24 GB | Qwen 3.8 27B as a smaller 4-bit file (about 15 GB) |
| 32 GB or more | The full 4-bit Qwen 3.8 27B download, with vision |
| 128 GB or more | Qwen 3.8 27B at 8-bit with long context, or several models loaded at once |
These follow the minimum memory in the app’s catalog. Qwen 3.8 has no official small sizes. The 4B and 9B “Qwen 3.8” files on Hugging Face are community distills, and the app points you to Qwen 3.5 4B and 9B instead.
Set it up
- Install Off Grid AI Desktop and open it.
- Open Models and search for Qwen 3.8 27B, or pick a model the app marks as a fit.
- If you see Tight on RAM or Won’t fit, go one size down. Loading anyway doesn’t add memory.
- Start a chat, pick the model and send a short prompt.
The app runs models through llama.cpp on Metal, so your Mac’s GPU does the work. Chats stay on your Mac, and the model keeps working offline after the download.
What goes wrong, and the fix
| Symptom | Check | Fix |
|---|---|---|
| Model won’t load | Fit badge in Models | Pick a smaller quant or model |
| Mac slows down while it answers | Other apps holding memory | Close heavy apps, or use a smaller model |
| Long chats get slow | Context window in Model settings | Lower it, or start a new chat |
| Download fails | Free disk space | Qwen 3.8 27B needs about 17.5 GB |
Need the full-size model?
If you want DeepSeek V4.1 Flash without a $5,000 to $9,500 Mac, Off Grid AI Boost is a flat-price API for open models on our GPUs, with DeepSeek V4.1 Flash and Qwen 3.8 on the list. It starts at $4.99 a month for the first cohort, with regular prices from $9.99 to $199.99. We don’t store your prompts or train on them. That’s our promise today, and the full policy comes with launch.
A 256 GB Mac Studio is about $9,500. Boost’s lowest plan is $4.99 a month. That’s a price comparison only. Boost’s usage limits aren’t published yet, so we’re not claiming it matches a Mac Studio on speed or volume.
Boost starts in January; pre-order to lock in half price. API keys arrive by January 2027.
FAQ
Can a 16 GB MacBook run Qwen 3.8?
Yes, as Bonsai 2 27B. It’s Prism ML’s 7.2 GB build of Qwen 3.8 27B, plus a 0.63 GB vision file, and Off Grid AI Desktop lists it for 16 GB. The standard 4-bit file is 16.5 GB and is too big for a 16 GB Mac.
Can a 64 GB Mac run DeepSeek V4.1 Flash?
Unsloth says the 1-bit build runs on 64 GB but slower. 128 GB is the size it recommends.
Is a Mac better than a PC for big models?
For models that need a lot of memory, yes, because the GPU uses all of the unified memory. A PC graphics card tops out at 32 GB on the RTX 5090.
Does Off Grid AI Desktop run DeepSeek V4.1 Flash?
We haven’t confirmed it loads in the app yet. Unsloth’s guide uses llama.cpp with settings that keep the Engram table on your SSD.
Is Off Grid AI Desktop free on Mac?
Yes. It’s free and open source, with no account.
See what your Mac runs today before you configure a new one. Download Off Grid AI Desktop.