Can I Run Yi 1.5 9B Chat on NVIDIA GeForce RTX 4090?
Written by Jakub Rusinowski · Last updated September 29, 2026
Yes. Yi 1.5 9B Chat needs 6.9 GB at 8K context (5.3 GB weights + 1.6 GB KV cache/overhead) at Q4_K_M and the NVIDIA GeForce RTX 4090 has 24 GB, leaving about 17.1 GB of headroom, at roughly 119 tok/s (estimated) with room for up to 16K of context.
See what else this hardware can run →
The numbers
| Model | Yi 1.5 9B Chat |
| Parameters | 9B |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 6.9 GB |
| NVIDIA GeForce RTX 4090 VRAM | 24 GB |
| Verdict | Runs |
| Max context | 16K |
| Estimated speed | ~119 tok/s |
Yi 1.5 9B Chat on the NVIDIA GeForce RTX 4090: VRAM by quantization
| Quant | VRAM needed | Fits 24 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 19.3 GB | ✓ Yes | 16K | — |
| Q8_0 | 11 GB | ✓ Yes | 16K | — |
| Q6_K | 8.8 GB | ✓ Yes | 16K | — |
| Q5_K_M | 7.9 GB | ✓ Yes | 16K | — |
| Q4_K_M | 6.9 GB | ✓ Yes | 16K | — |
| Q3_K_M | 5.4 GB | ✓ Yes | 16K | — |
| Q2_K | 4.5 GB | ✓ Yes | 16K | — |
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 24 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 Q4_K_M on the NVIDIA GeForce RTX 4090: 8K 6.9 GB · 31K 9.3 GB. Every window this model publishes still fits 24 GB.
What to do next
Nothing to change — run it at Q4_K_M. If you want more capability, check whether the next size up also fits.
No compatible GPU? Yi 1.5 9B Chat on 8 GB of system RAM, CPU only: runs.
Running Yi 1.5 9B Chat on this card:
At 2 hrs/day, buying (~$1,599) beats renting at $0.34/hr after about 6.5 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.
Other Yi 1.5 Family sizes on the NVIDIA GeForce RTX 4090
- Yi 1.5 34B Chat — runs (23.6 GB)
Yi 1.5 9B Chat on nearby hardware
- Intel Arc B580 (12 GB) — runs
- NVIDIA GeForce RTX 5090 (32 GB) — runs
All Yi 1.5 Family sizes on the NVIDIA GeForce RTX 4090 | Yi 1.5 9B Chat model page | NVIDIA GeForce RTX 4090 GPU page | VRAM calculator | Check your hardware