Running dual RX 7900 XTX on X570/X870 Taichi for local LLM inference: is x8/x8 enough?
espece-de-bon · reddit · 2026-09-08
发帖人计划在 AMD 平台搭建本地推理机,询问 X570/X870E Taichi 主板搭配合适 CPU 实现 PCIe x8/x8 双卡是否可行。目标负载为 Qwen3 系列的 27B Dense 与 30B-A3B MoE 模型(用于编程),候选显卡组合为 2×7900 XT(共 40GB)或 2×7900 XTX(共 48GB),希望模型加上下文全部装进 VRAM。配套计划包括 1200W 以上电源、大机箱与充足散热。作者明确回避 NVIDIA(同显存价格更高),并给出备选方案:笔记本 + eGPU 扩展坞 + 单张 7900 XTX(知晓 USB4 带宽限制),征求有实际经验者的反馈。
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