Can I Run 1-bit Bonsai 27B on NVIDIA GeForce RTX 5070?
Written by Jakub Rusinowski · Last updated July 15, 2026
Yes. 1-bit Bonsai 27B needs 6.3 GB at 8K context (3.8 GB weights + 2.5 GB KV cache/overhead) at 1-bit (binary, ~1.125 bpw) and the NVIDIA GeForce RTX 5070 has 12 GB, leaving about 5.7 GB of headroom, at roughly 96 tok/s (estimated) with room for up to 32K of context.
See what else this hardware can run →
The numbers
| Model | 1-bit Bonsai 27B |
| Parameters | 27B |
| Quantization | 1-bit (binary, ~1.125 bpw) |
| VRAM needed (8K context) | 6.3 GB |
| NVIDIA GeForce RTX 5070 VRAM | 12 GB |
| Verdict | Runs |
| Max context | 32K |
| Estimated speed | ~96 tok/s |
1-bit Bonsai 27B on the NVIDIA GeForce RTX 5070: VRAM by quantization
| Quant | VRAM needed | Fits 12 GB? | Max context | Whole PC |
|---|---|---|---|---|
| 1-bit (binary, ~1.125 bpw) | 6.3 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 12 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 1-bit (binary, ~1.125 bpw) on the NVIDIA GeForce RTX 5070: 8K 6.3 GB · 32K 11.6 GB · 128K 32.5 GB ✗. Past 128K it no longer fits 12 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 1-bit (binary, ~1.125 bpw). If you want more capability, check whether the next size up also fits.
No compatible GPU? 1-bit Bonsai 27B on 16 GB of system RAM, CPU only: runs comfortably.
Running 1-bit Bonsai 27B on this card:
At 2 hrs/day, buying (~$549) beats renting at $0.34/hr after about 2.2 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 Bonsai 27B sizes on the NVIDIA GeForce RTX 5070
- Ternary Bonsai 27B — runs (8.3 GB)
1-bit Bonsai 27B on nearby hardware
- Intel Arc B570 (10 GB) — runs
All Bonsai 27B sizes on the NVIDIA GeForce RTX 5070 | 1-bit Bonsai 27B model page | NVIDIA GeForce RTX 5070 GPU page | VRAM calculator | Check your hardware