Can I Run IBM Granite 4.1 on NVIDIA L40S?
Written by Jakub Rusinowski · Last updated July 21, 2026
Yes, comfortably — Granite 4.1 30B at FP8 (Q4 est. ~12-15GB, unconfirmed) needs 33.5 GB at 8K context (30.9 GB weights + 2.6 GB KV cache/overhead), leaving ~14.5 GB of the NVIDIA L40S's 48 GB, at ~24 tok/s (est.).
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NVIDIA L40S Specs
| VRAM | 48 GB |
| Memory Bandwidth | 864 GB/s |
Granite 4.1 30B on the NVIDIA L40S: VRAM by quantization
| Quant | VRAM needed | Fits 48 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 62.6 GB | ✗ No | — | — |
| Q8_0 | 34.5 GB | ✓ Yes | 64K | Build for this |
| Q6_K | 27.2 GB | ✓ Yes | 64K | — |
| Q5_K_M | 23.8 GB | ✓ Yes | 64K | Build for this |
| Q4_K_M | 20.7 GB | ✓ Yes | 128K | Build for this |
| Q3_K_M | 15.4 GB | ✓ Yes | 128K | — |
| Q2_K | 12.4 GB | ✓ Yes | 128K | — |
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 48 GB. 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 FP8 (Q4 est. ~12-15GB, unconfirmed) on the NVIDIA L40S: 8K 33.5 GB · 32K 38.9 GB · 128K 60.2 GB ✗. Past 128K it no longer fits 48 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Granite 4.1 30B on 32 GB of system RAM, CPU only: runs comfortably.
IBM Granite 4.1 Sizes That Fit the NVIDIA L40S (at 8K context)
| Granite 4.1 30B | FP8 (Q4 est. ~12-15GB, unconfirmed) · 33.5 GB at 8K context · ~24 tok/s (est.) |
| Granite 4.1 8B | Q4_K_M · 6.8 GB at 8K context · ~111 tok/s (est.) |
| Granite 4.1 3B | Q4_K_M · 3.5 GB at 8K context · ~199 tok/s (est.) |
At 2 hrs/day, buying (~$7,499) beats renting at $0.55/hr after about 18.9 years.
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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
Is the NVIDIA L40S enough to run IBM Granite 4.1 locally?
Yes, comfortably — Granite 4.1 30B at FP8 (Q4 est. ~12-15GB, unconfirmed) needs 33.5 GB at 8K context (30.9 GB weights + 2.6 GB KV cache/overhead), leaving ~14.5 GB of the NVIDIA L40S's 48 GB, at ~24 tok/s (est.).
What's the best IBM Granite 4.1 size for the NVIDIA L40S?
Granite 4.1 30B at FP8 (Q4 est. ~12-15GB, unconfirmed) quantization needs 33.5 GB at 8K context (30.9 GB weights + 2.6 GB KV cache/overhead), estimated ~24 tokens/sec.
Every IBM Granite 4.1 size on the NVIDIA L40S
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Granite 4.1 30B | 33.5 GB | Runs | ~24 tok/s |
| Granite 4.1 8B | 6.8 GB | Runs | ~111 tok/s |
| Granite 4.1 3B | 3.5 GB | Runs | ~199 tok/s |
IBM Granite 4.1 on Other GPUs
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