Can I Run Phi-4 Family on AMD Radeon RX 7900 XT?
Autor: Jakub Rusinowski · Ostatnia aktualizacja: 11 listopada 2026
Yes, comfortably — Phi-4 Reasoning Vision 15B at Q4_K_M needs 11.6 GB at 8K context (9.1 GB weights + 2.5 GB KV cache/overhead), leaving ~8.4 GB of the AMD Radeon RX 7900 XT's 20 GB, at ~44 tok/s (est.), with room for up to 16K context.
See what else this hardware can run →
lub porównaj w Vast.ai od $0.35/godz. (typical low · varies)
Jako partner Amazon zarabiamy na kwalifikujących się zakupach. Linki do chmurowych GPU są linkami polecającymi — możemy otrzymać prowizję bez dodatkowych kosztów dla Ciebie.
AMD Radeon RX 7900 XT Specs
| VRAM | 20 GB |
| Memory Bandwidth | 800 GB/s |
Phi-4 Reasoning Vision 15B on the AMD Radeon RX 7900 XT: VRAM by quantization
| Quant | VRAM needed | Fits 20 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 32.7 GB | ✗ No | — | — |
| Q8_0 | 18.5 GB | ✓ Yes | 8K | — |
| Q6_K | 14.9 GB | ✓ Yes | 16K | — |
| Q5_K_M | 13.2 GB | ✓ Yes | 16K | — |
| Q4_K_M | 11.6 GB | ✓ Yes | 16K | — |
| Q3_K_M | 8.9 GB | ✓ Yes | 16K | — |
| Q2_K | 7.4 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 20 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 AMD Radeon RX 7900 XT: 8K 11.6 GB · 16K 13.3 GB. Every window this model publishes still fits 20 GB.
No compatible GPU? Phi-4 Reasoning Vision 15B on 16 GB of system RAM, CPU only: runs, but it is tight.
Phi-4 Family Sizes That Fit the AMD Radeon RX 7900 XT (at 8K context)
| Phi-4 Reasoning Vision 15B | Q4_K_M · 11.6 GB at 8K context · ~44 tok/s (est.) |
| Phi-4 (14B) | Q4_K_M · 10.9 GB at 8K context · ~47 tok/s (est.) |
At 2 hrs/day, buying (~$899) beats renting at $0.34/hr after about 3.7 years.
Affiliate links — we may earn a commission if you sign up, at no extra cost to you.
Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Does the AMD Radeon RX 7900 XT have enough VRAM for Phi-4 Family?
Yes, comfortably — Phi-4 Reasoning Vision 15B at Q4_K_M needs 11.6 GB at 8K context (9.1 GB weights + 2.5 GB KV cache/overhead), leaving ~8.4 GB of the AMD Radeon RX 7900 XT's 20 GB, at ~44 tok/s (est.), with room for up to 16K context.
Which quantization of Phi-4 Family should I use on the AMD Radeon RX 7900 XT?
Phi-4 Reasoning Vision 15B at Q4_K_M quantization needs 11.6 GB at 8K context (9.1 GB weights + 2.5 GB KV cache/overhead), estimated ~44 tokens/sec, up to 16K context.
Phi-4 Family on Other GPUs
- Phi-4 Family on NVIDIA GeForce RTX 5080
- Phi-4 Family on NVIDIA GeForce RTX 5070 Ti
- Phi-4 Family on NVIDIA GeForce RTX 5060 Ti 16GB
- Phi-4 Family on NVIDIA GeForce RTX 4080 Super
Popular Models on the AMD Radeon RX 7900 XT
- DeepSeek R1 on AMD Radeon RX 7900 XT
- Qwen 3 on AMD Radeon RX 7900 XT
- Qwen 2.5 Family on AMD Radeon RX 7900 XT
VRAM Tier
Troubleshooting
Buying Guide
← Can I Run It? | Phi-4 Family Model Page | AMD Radeon RX 7900 XT GPU Page | VRAM calculator | Check Your Hardware