Can I Run IBM Granite 4.2 on Apple M4?
作者： Jakub Rusinowski · 最后更新： 2026年9月11日
Yes, comfortably — Granite 4.2 30B at Q4_K_M needs 20.7 GB at 8K context (18.1 GB weights + 2.6 GB KV cache/overhead), leaving ~3.3 GB of the Apple M4's 24 GB usable memory, at ~3 tok/s (est.), with room for up to 16K context.
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Apple M4 Specs
| VRAM | 32 GB unified memory |
| Memory Bandwidth | 120 GB/s |
Granite 4.2 30B on the Apple M4: VRAM by quantization
| Quant | VRAM needed | Fits 32 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 62.6 GB | ✗ No | — | — |
| Q8_0 | 34.5 GB | ✗ No | — | — |
| Q6_K | 27.2 GB | ✗ No | — | — |
| Q5_K_M | 23.8 GB | ✓ Yes | 8K | — |
| Q4_K_M | 20.7 GB | ✓ Yes | 16K | — |
| Q3_K_M | 15.4 GB | ✓ Yes | 32K | — |
| Q2_K | 12.4 GB | ✓ Yes | 32K | — |
Assumes an 8K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 32 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 M4: 8K 20.7 GB · 32K 26 GB ✗ · 128K 47.4 GB ✗. Past 32K it no longer fits 32 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Granite 4.2 30B on 32 GB of system RAM, CPU only: runs comfortably.
IBM Granite 4.2 Sizes That Fit the Apple M4 (at 8K context)
| Granite 4.2 30B | Q4_K_M · 20.7 GB at 8K context · ~3 tok/s (est.) |
| Granite 4.2 8B | Q4_K_M · 6.8 GB at 8K context · ~12 tok/s (est.) |
| Granite 4.2 3B | Q4_K_M · 3.5 GB at 8K context · ~27 tok/s (est.) |
IBM Granite 4.2 needs ~21 GB but this GPU has 32 GB. Rent a RTX 4090 (24 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
IBM Granite 4.2 on the Apple M4 — does it fit?
Yes, comfortably — Granite 4.2 30B at Q4_K_M needs 20.7 GB at 8K context (18.1 GB weights + 2.6 GB KV cache/overhead), leaving ~3.3 GB of the Apple M4's 24 GB usable memory, at ~3 tok/s (est.), with room for up to 16K context.
Which IBM Granite 4.2 variant fits best on the Apple M4?
Granite 4.2 30B at Q4_K_M quantization needs 20.7 GB at 8K context (18.1 GB weights + 2.6 GB KV cache/overhead), estimated ~3 tokens/sec, up to 16K context.
Every IBM Granite 4.2 size on the Apple M4
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Granite 4.2 30B | 20.7 GB | Runs | ~3 tok/s |
| Granite 4.2 8B | 6.8 GB | Runs | ~12 tok/s |
| Granite 4.2 3B | 3.5 GB | Runs | ~27 tok/s |
IBM Granite 4.2 on Other GPUs
- IBM Granite 4.2 on NVIDIA GeForce RTX 5090
- IBM Granite 4.2 on Apple M2 Pro
- IBM Granite 4.2 on Apple M1 Pro
- IBM Granite 4.2 on Apple M5
- IBM Granite 4.2 on Apple M3 Pro
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