PCIe 2.0 means 2x32x
 

PCIe is defined for 1X, 2X, 4X, 8X, 16X and even 32X lanes. The maximum data transfer for 32 lanes is eight Gigabytes of data per second, per direction. Once the industry moves to PCIe 2.0 the amount of transfer will theoretically double from 2.5 to 5.0GT/s . This will enable 16 GB/s transfer and two times 32X PCIe lanes.

http://www.theinquirer.net/default.aspx?article=36364