it's not like Those PCI slots realy "slow down" the system or anything... and what would you plug in those extra PCIe Slots at this time that you cannnot plug in a PCI slot?
If anything, PCI wil stay for quite a while to insure backwards compatibility. Considering that there were still ISA slots on many P3 (2000) MBs and that PCI started appearing on MBs with the Pentium 1 (1995) I would suggest that PCI will diseapear from MBs in 2009.
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