Can I Run Gemma 3 27B Instruct on NVIDIA GeForce RTX 5090?
Autor: Jakub Rusinowski · Ostatnia aktualizacja: 29 września 2026
Yes. Gemma 3 27B Instruct needs 25.4 GB at 8K context (16.3 GB weights + 9.1 GB KV cache/overhead) at Q4_K_M and the NVIDIA GeForce RTX 5090 has 32 GB, leaving about 6.6 GB of headroom, at roughly 64 tok/s (estimated) with room for up to 8K of context.
See what else this hardware can run →
The numbers
| Model | Gemma 3 27B Instruct |
| Parameters | 27B |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 25.4 GB |
| NVIDIA GeForce RTX 5090 VRAM | 32 GB |
| Verdict | Runs |
| Max context | 8K |
| Estimated speed | ~64 tok/s |
Gemma 3 27B Instruct on the NVIDIA GeForce RTX 5090: VRAM by quantization
| Quant | VRAM needed | Fits 32 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 63.1 GB | ✗ No | — | — |
| Q8_0 | 37.8 GB | ✗ No | — | — |
| Q6_K | 31.3 GB | ✓ Yes | 8K | — |
| Q5_K_M | 28.3 GB | ✓ Yes | 8K | — |
| Q4_K_M | 25.4 GB | ✓ Yes | 8K | — |
| Q3_K_M | 20.6 GB | ✓ Yes | 16K | — |
| Q2_K | 18 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 32 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 5090: 8K 25.4 GB · 32K 50.4 GB ✗ · 128K 150.2 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.
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? Gemma 3 27B Instruct on 32 GB of system RAM, CPU only: runs comfortably.
Running Gemma 3 27B Instruct on this card:
At 2 hrs/day, buying (~$1,999) beats renting at $0.55/hr after about 5.0 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 Gemma 3 sizes on the NVIDIA GeForce RTX 5090
- Gemma 3 12B Instruct — runs (11.1 GB)
- Gemma 3 4B Instruct — runs (4.4 GB)
- Gemma 3 1B Instruct — runs (2 GB)
Gemma 3 27B Instruct on nearby hardware
- AMD Radeon RX 7900 XTX (24 GB) — runs at a lower quant
- Apple M3 Pro (36 GB) — runs
All Gemma 3 sizes on the NVIDIA GeForce RTX 5090 | Gemma 3 27B Instruct model page | NVIDIA GeForce RTX 5090 GPU page | VRAM calculator | Check your hardware