租一张 GPU，电费其实只是零头
一张 GPU 跑一小时，电费大概一毛到三毛多美元，租金要两美元往上。所以算力生意的账都在合同里，价格锁多久，卡闲下来谁兜底。最后用 Abilene 把整个系列串一遍。
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