A question about PCI Express?

There are 4 different PCI-express standards (1x, 4x, 8x, 16x). The 1x and 16x standards are used frequently but what about the other 2 (4x and 8x)? Why don’t we use them? Why are we continuing to use the x1 standard when faster throughput can be achieved with 4x and 8x? Please add the site [...] http://bit.ly/oOxxSL