PC Build to Run Phi-4 (14B) Locally (Q8_0)

作者： Jakub Rusinowski · 最后更新： 2025年1月6日

A complete parts list — GPU, motherboard, RAM and PSU — worked backward from Phi-4 (14B)'s VRAM requirement at Q8_0. Prices are 2026 street estimates and vary.

Requirements

VRAM required~17 GB at Q8_0
System RAM32 GB
Estimated speed~47 tok/s
Complete build (est.)$1,749

Assumes an 8K-token context with an f16 KV cache. A longer window needs more; a quantized KV cache needs less.

购买此硬件 AMD Radeon RX 7900 XT 20GB — 20 GB VRAM · 315 W board power立即云端部署 RunPod 上的 RTX 4090 — 低至 $0.34/小时 · 价格核实于 2026-07

或在 Vast.ai 比较，低至 $0.35/小时 (typical low · varies)

作为亚马逊联盟成员，我们从符合条件的购买中获得收入。云 GPU 链接为推荐链接——我们可能获得佣金，您无需额外付费。

联盟营销声明: 本页部分链接为联盟推广链接——如果你通过它们购买，LLM Configurator 可能会获得佣金，而你无需支付任何额外费用。作为亚马逊联盟成员（Amazon Associate），LLM Configurator 会从符合条件的购买中获得收益。

GPU: AMD Radeon RX 7900 XT

AMD Radeon RX 7900 XT's 20 GB covers Phi-4 (14B) at Q8_0 (~17 GB needed), with headroom.

AMD Radeon RX 7900 XT 20GB
20 GB VRAM · 315 W board power
2026年价格波动较大——请以当前商品页价格为准。
在亚马逊查看价格

Motherboard: ASUS TUF Gaming B650-PLUS WIFI

B650 (AM5) — pairs with the AMD Ryzen 7 7700; DDR5, dual PCIe 4.0 x16 (x8/x8) for multi-GPU, 4 DIMM slots to 256 GB.

ASUS TUF Gaming B650-PLUS WIFI
2026年价格波动较大——请以当前商品页价格为准。
在亚马逊查看价格

RAM: Corsair Vengeance 32GB (2x16GB) DDR5-6000 C30 (AMD EXPO)

32 GB DDR5-6000 (2x16GB) meets Phi-4 (14B)'s 32 GB recommended system RAM.

Corsair Vengeance 32GB (2x16GB) DDR5-6000 C30
2026年价格波动较大——请以当前商品页价格为准。
在亚马逊查看价格

PSU: Corsair RM650e (ATX 3.1)

650 W 80+ Gold covers AMD Radeon RX 7900 XT (315 W) + CPU 65 W with 30% headroom (~494 W required).

Corsair RM650e (ATX 3.1)
2026年价格波动较大——请以当前商品页价格为准。
在亚马逊查看价格

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FAQ

What GPU do I need to run Phi-4 (14B) at Q8_0?

AMD Radeon RX 7900 XT's 20 GB covers Phi-4 (14B) at Q8_0 (~17 GB needed), with headroom.

How much VRAM does Phi-4 (14B) need at Q8_0?

About 17 GB of VRAM plus 32 GB of system RAM.

What power supply does a AMD Radeon RX 7900 XT build need?

650 W 80+ Gold covers AMD Radeon RX 7900 XT (315 W) + CPU 65 W with 30% headroom (~494 W required).

How much does a Phi-4 (14B) PC cost?

About $1,749 for a complete build (GPU, motherboard, RAM, PSU, CPU, case, SSD), at 2026 street-price estimates.

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← Budget-first build recommender | Phi-4 Family model page | AMD Radeon RX 7900 XT review