Can I Run Phi-4 Family on NVIDIA GeForce RTX 4070 Ti?
Written by Jakub Rusinowski · Last updated September 29, 2026
Yes, but it's tight — Phi-4 (14B) at Q4_K_M needs 10.9 GB at 8K context (8.5 GB weights + 2.4 GB KV cache/overhead), leaving ~1.1 GB of the NVIDIA GeForce RTX 4070 Ti's 12 GB, at ~45 tok/s (est.), with room for up to 8K context.
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NVIDIA GeForce RTX 4070 Ti Specs
| VRAM | 12 GB |
| Memory Bandwidth | 504 GB/s |
Phi-4 (14B) on the NVIDIA GeForce RTX 4070 Ti: VRAM by quantization
| Quant | VRAM needed | Fits 12 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 30.5 GB | ✗ No | — | — |
| Q8_0 | 17.4 GB | ✗ No | — | Build for this |
| Q6_K | 14 GB | ✗ No | — | — |
| Q5_K_M | 12.4 GB | ✗ No | — | Build for this |
| Q4_K_M | 10.9 GB | ✓ Yes | 8K | Build for this |
| Q3_K_M | 8.4 GB | ✓ Yes | 16K | — |
| Q2_K | 7.1 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 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 Q4_K_M on the NVIDIA GeForce RTX 4070 Ti: 8K 10.9 GB · 16K 12.6 GB ✗. Past 16K it no longer fits 12 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Phi-4 (14B) on 16 GB of system RAM, CPU only: runs, but it is tight.
Phi-4 Family Sizes That Fit the NVIDIA GeForce RTX 4070 Ti (at 8K context)
| Phi-4 (14B) | Q4_K_M · 10.9 GB at 8K context · ~45 tok/s (est.) |
At 2 hrs/day, buying (~$799) beats renting at $0.34/hr after about 3.3 years.
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FAQ
Phi-4 Family on the NVIDIA GeForce RTX 4070 Ti — does it fit?
Yes, but it's tight — Phi-4 (14B) at Q4_K_M needs 10.9 GB at 8K context (8.5 GB weights + 2.4 GB KV cache/overhead), leaving ~1.1 GB of the NVIDIA GeForce RTX 4070 Ti's 12 GB, at ~45 tok/s (est.), with room for up to 8K context.
Which Phi-4 Family variant fits best on the NVIDIA GeForce RTX 4070 Ti?
Phi-4 (14B) at Q4_K_M quantization needs 10.9 GB at 8K context (8.5 GB weights + 2.4 GB KV cache/overhead), estimated ~45 tokens/sec, up to 8K context.
Phi-4 Family on Other GPUs
- Phi-4 Family on NVIDIA GeForce RTX 5070
- Phi-4 Family on NVIDIA GeForce RTX 4070 Super
- Phi-4 Family on NVIDIA GeForce RTX 4070
- Phi-4 Family on NVIDIA GeForce RTX 3060 (12GB)
- Phi-4 Family on Intel Arc B580
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VRAM Tier
Troubleshooting
- CUDA out of memory — why it happens and how to fix it
- Which GGUF quant should I download? (Q4 vs Q5 vs Q8)
Buying Guide
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