内存带宽这东西，别总往死里算那些死公式。
你想想，它就像是一个水池，水池里的水流速度（带宽）不取决于池子有多大，而取决于水龙头开多大，也就是你从哪根水管接出来的接口。在计算机世界里，这根“水管”就是内存数据线，接口就是地址总线。一条线能跑多快，直接拍板你能每秒从硬盘里捞出来多少数据。记得那会儿那会儿，游戏卡顿特别严重，有时候就是卡在这个地方：显卡画出了天下无敌的 4K 画面，可显卡给 CPU 的数据像被堵在窄巴的巷子里，根本推不动。
那时候大家聊带宽，总爱扯几千万位的数据，听起来牛逼哄哄。
实际上那只是带宽的“上限”。真正的感受，是你玩游戏时那一瞬间的停顿，要么是加载网页时那种拖泥带水的感觉。
这时候你才发现，你跑的是 200 GHz 的 Token Rate，而不是理论上那 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