Can I run it?
Can I run granite 4.2 8b on GeForce RTX 4090?
Runs
Runs fully on your GeForce RTX 4090 at BF16, 8K context, about 29–40 tok/s. Weights 16.4 GB plus 1.25 GB of KV cache — 18.1 GB of 22.3 GB usable. Up to 32K context still fits.
Best quantBF16
Working context8K
Max that fits32K
Speed29–40 tok/s
Weights16.4 GB
KV cache1.25 GB
Total18.1 GB
Usable22.3 GB
granite 4.2 8b details · GeForce RTX 4090 page · How this estimate is made
Run commands
llama.cpp
llama-server -hf ibm-granite/granite-4.2-8b-GGUF:BF16 -c 8192 -ngl 40
No matching name in the Ollama library snapshot.
LM Studio
lms get ibm-granite/granite-4.2-8b-GGUF # Then load quant BF16
Assumptions
- Estimate, not a benchmark. Decode speed uses a memory-bandwidth model at 55–75% of peak.
- KV cache is FP16. Engine overhead assumes llama.cpp (0.3 GB + 1% of the weights). Ollama is closer to 0.9 GB + 3%, LM Studio closer to 1 GB + 3%.
- BF16 size is the real GGUF file size from Hugging Face.
- 0.5 GB is reserved because this GPU also drives a display, then 5% of the rest is left free.
- Speed is quoted at 8K context, not at the maximum context that still fits.
Larger models that also fit
- Can I run Qwen3.8 27B on GeForce RTX 4090? — Tight fit, UD-Q6_K, 25–34 tok/s
- Can I run gemma 4 12b it on GeForce RTX 4090? — Runs, UD-Q8_K_XL, 33–45 tok/s
- Can I run Qwen3.5 9B on GeForce RTX 4090? — Runs, BF16, 30–42 tok/s
Updated 2026-10-24. Profile on this page is the device default plus 32 GB of DDR5-5600 system RAM.