Can I Run Phi-4 Family on AMD Radeon RX 7800 XT?
作者： Jakub Rusinowski · 最后更新： 2026年11月11日
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 ~4.4 GB of the AMD Radeon RX 7800 XT's 16 GB, at ~36 tok/s (est.), with room for up to 16K context.
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AMD Radeon RX 7800 XT Specs
| VRAM | 16 GB |
| Memory Bandwidth | 624 GB/s |
Phi-4 Reasoning Vision 15B on the AMD Radeon RX 7800 XT: VRAM by quantization
| Quant | VRAM needed | Fits 16 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 32.7 GB | ✗ No | — | — |
| Q8_0 | 18.5 GB | ✗ No | — | — |
| Q6_K | 14.9 GB | ✓ Yes | 8K | — |
| 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 16 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 7800 XT: 8K 11.6 GB · 16K 13.3 GB. Every window this model publishes still fits 16 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 7800 XT (at 8K context)
| Phi-4 Reasoning Vision 15B | Q4_K_M · 11.6 GB at 8K context · ~36 tok/s (est.) |
| Phi-4 (14B) | Q4_K_M · 10.9 GB at 8K context · ~38 tok/s (est.) |
At 2 hrs/day, buying (~$499) beats renting at $0.34/hr after about 2.0 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.
FAQ
Can I run Phi-4 Family on the AMD Radeon RX 7800 XT?
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 ~4.4 GB of the AMD Radeon RX 7800 XT's 16 GB, at ~36 tok/s (est.), with room for up to 16K context.
What's the best Phi-4 Family size for the AMD Radeon RX 7800 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 ~36 tokens/sec, up to 16K context.
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