Can I Run Command R Family on Apple M1 Ultra?
Written by Jakub Rusinowski · Last updated July 12, 2026
Yes, comfortably — Command R+ (104B) at Q4_K_M needs 65.7 GB at 8K context (62.8 GB weights + 2.9 GB KV cache/overhead), leaving ~30.3 GB of the Apple M1 Ultra's 96 GB usable memory, at ~7 tok/s (est.), with room for up to 64K context.
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Apple M1 Ultra Specs
| VRAM | 128 GB unified memory |
| Memory Bandwidth | 800 GB/s |
Command R+ (104B) on the Apple M1 Ultra: VRAM by quantization
| Quant | VRAM needed | Fits 128 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 210.9 GB | ✗ No | — | — |
| Q8_0 | 113.4 GB | ✗ No | — | — |
| Q6_K | 88.2 GB | ✓ Yes | 32K | — |
| Q5_K_M | 76.7 GB | ✓ Yes | 64K | — |
| Q4_K_M | 65.7 GB | ✓ Yes | 64K | — |
| Q3_K_M | 47.3 GB | ✓ Yes | 64K | — |
| Q2_K | 37.1 GB | ✓ Yes | 64K | — |
Assumes an 8K-token context with an f16 KV cache. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 128 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the Apple M1 Ultra: 8K 65.7 GB · 32K 72.2 GB · 125K 97.1 GB ✗. Past 125K it no longer fits 128 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Command R+ (104B) on 256 GB of system RAM, CPU only: runs, but too slowly to be worth it.
Command R Family Sizes That Fit the Apple M1 Ultra (at 8K context)
| Command R+ (104B) | Q4_K_M · 65.7 GB at 8K context · ~7 tok/s (est.) |
| Command R (35B) | Q4_K_M · 32.7 GB at 8K context · ~16 tok/s (est.) |
Command R Family needs ~66 GB but this GPU has 128 GB. Rent a A100 (80 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Command R Family on the Apple M1 Ultra — does it fit?
Yes, comfortably — Command R+ (104B) at Q4_K_M needs 65.7 GB at 8K context (62.8 GB weights + 2.9 GB KV cache/overhead), leaving ~30.3 GB of the Apple M1 Ultra's 96 GB usable memory, at ~7 tok/s (est.), with room for up to 64K context.
Which Command R Family variant fits best on the Apple M1 Ultra?
Command R+ (104B) at Q4_K_M quantization needs 65.7 GB at 8K context (62.8 GB weights + 2.9 GB KV cache/overhead), estimated ~7 tokens/sec, up to 64K context.
Every Command R Family size on the Apple M1 Ultra
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Command R+ (104B) | 65.7 GB | Runs | ~7 tok/s |
| Command R (35B) | 32.7 GB | Runs | ~16 tok/s |
Command R Family on Other GPUs
- Command R Family on Apple M4 Max
- Command R Family on Apple M5 Max
- Command R Family on NVIDIA DGX Spark
- Command R Family on AMD Ryzen AI Max+ 395
Popular Models on the Apple M1 Ultra
VRAM Tier
Troubleshooting
Buying Guide
← Can I Run It? | Command R Family Model Page | Apple M1 Ultra GPU Page | VRAM calculator | Check Your Hardware