全球第一款6nm AMD RX 6500 XT显卡即将解禁上市

AMD RX 6500 XT显卡马上就要解禁上市了。虽然定位入门级，但它是全球第一款6nm工艺游戏卡，也是备受关注。

既然是入门卡，规格自然会有各种精简，但意外的是，它的系统带宽只有PCIe 4.0 x4——RX 6600系列是PCIe 4.0 x8，RX 6700系列及更高则是完整的PCIe 4.0 x16。

PCIe 4.0 x4其实是如今高端SSD常用的规格，带宽8GB/s，相当于上代PCIe 3.0 x8，理论上对入门显卡是基本够用的，那么实际游戏中会不会有明显影响呢?

HardwareUnboxed提前用上代RX 5500 XT进行了一次测试——诡异的是，RX 5500 XT支持的还是PCIe 4.0 x8，而且显存有4GB/8GB两种可选，更凸显了RX 6600 XT的“倒退”。

《古墓丽影崛起》，1080p最高画质，8GB显存的时候，PCIe 4.0 x4对比PCIe 4.0 x8毫无损失，PCIe 3.0 x4平均帧率、1%最低帧都丢了2FPS。

4GB显存的时候更明显，平均帧丢了4FPS，1%最低帧则损失1FPS，PCIe 3.0 x4就很惨了，平均帧、1%最低帧锐减25%、42%。

《毁灭战士：永恒》，1080最高画质，差别就更明显了，8GB/4GB显存的时候，PCIe 4.0 x4平均帧分别下降7.5%、22.1%，后者的1%最低帧也大减22%。

PCIe 3.0 x4简直就没法看了。

汇总12款游戏，PCIe 3.0 x4对比PCIe 4.0 x8平均损失几乎一半，最高达到了171%。

可惜，没有汇总对比PCIe 4.0 x4、PCIe 4.0 x8……

当然，RX 6500 XT依然有16MB无限缓存，能在一定程度上补偿带宽损失，但也不要期望太多。

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