请问HN：最好的二手服务器市场有哪些？
二手服务器市场活跃吗？<p>最近在人工智能/高性能计算硬件领域发生了很多事情，我想知道当资金充足的公司进行升级时，上一代服务器最终会去哪里。我有兴趣购买一台配备GPU且具有足够显存的机器，以便进行本地微调、训练和批量推理。我可以用当前或旧款GPU组建一台工作站，但似乎购买一台二手的专业机架式服务器可能更具价值。
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Is there an active market for used servers?<p>With so much happening on the AI/HPC hardware front lately, I wonder where the prior-generation servers end up once well-funded companies upgrade. I'm interested in acquiring a GPU-laden machine with enough VRAM for local fine tuning, training, and batch inference. I could build a workstation with current or older-gen GPUs, but it seems like a used professionally built rack-mount machine could be higher value.