Intel would consider to be a new standard for expansion cards in the life to call, in the form of a new pci-express slot. That slot would have two lanes should go, enabling bottlenecks in bandwidth should disappear.
The current standard-pci-express-x1-slots, many of which expansion cards to use, can 500MB/s of bandwidth to deliver. Now sata-600 and usb 3.0 expansion cards, however, more commonplace, and hardware available is that the bandwidth can actually saturate, the single pci-express lane is not always the case. To increase the bandwidth available, can be a x4 slot be used, but Intel would consider a 2-slot to standard to elevate.
The unwillingness to x4 slots to use for sata-600 controllers or usb 3.0 cards would come out of a considerations. The wiring of such a lock allows the system board and chipsetontwerp more complex and more expensive. Moreover, less pci-express lanes left for other applications, such as managing different video cards. The use of a x2 slot would be much lower cost than a x4 slot, and relatively easy to implement.
Incidentally, would the input of a faster standard, pci-express 3.0, also offer a solution. The bandwidth per lane is 1GB/s, twice the bandwidth of the pci express 2.0 standard. Motherboards with pci-express 3.0 slots are still hardly available; manufacturer MSI is one of the few motherboards with the new standard is released. Only with the introduction of Intel’s Ivy Bridge processors, chipsets with pci-express 3.0 planned.