大约是一个PCI-E通道吞吐量的八分之一(请记住,八位到一个字节)。 有少量的PCI-E固态驱动器更喜欢x4端口,但似乎已被新的M.2标准Swift取代,后者也可以使用PCI-E总线 。 高端网卡和发烧级设备(如适配器和RAID控制器)使用x4和x8格式的混合。
切记:PCI-E端口大小和通道可能不一样(Remember: PCI-E Port Size and Lanes May Not Be the Same Thing)
Here’s one of the more confusing parts of the PCI-E setup: a port might be the size of an x16 card, but only have enough data lanes for something much less speedy, like x4. This is because while PCI-E can accommodate basically unlimited amounts of individual connections, there’s still a practical limit on the lane throughput of the chipset. Cheaper motherboards with more budget-oriented chipsets might only go up to a single x8 slot, even if that slot can physically accommodate an x16 card. Meanwhile, “gamer” motherboards will include up to four full x16-size and x16-lane PCI-E slots for maximum GPU compatibility. (We’ve discuss this in more detailhere.)
这是PCI-E设置中比较混乱的部分之一:端口可能只有x16卡的大小,但只有足够的数据通道来传输速度较慢的数据,例如x4。 这是因为尽管PCI-E可以容纳不限数量的单个连接,但是芯片组的通道吞吐量仍然存在实际限制。 具有更多预算