Our excitement stems from the fact that potential performance gains offered by PCIe Gen4 can be immediately realized with PCIe Gen4 SSDs. The same cannot be said for Gen4 graphics cards that use the next gen bus, because current graphic cards do not even fully exploit the full bandwidth of PCIe Gen3 x16. Consumer NVMe SSDs are another story altogether. Because consumer NVMe SSDs typically use 4 PCIe lanes, it has not taken long for most flagship SSDs to be able completely saturate the PCIe Gen3 x4 interface with sequential performance. We've been stuck at a maximum of about 3,600 MB/s sequential performance for well over a year now because of the limited bandwidth available from a PCIe Gen3 x4 interface.