Assuming, by 'PCI-X' you actually mean PCI-E(xpress), then most likely there won't be motherboards for Socket A that support this - atleast not a PCI-E 16x slot for videocards, as that would require a new Northbridge.
The Socket A-platform is going to be slowly phased out over the course of this year...which does not necessarily mean it will completely disappear, but don't expect too much new stuff to be released for an aging platform
You *might* theoretically see a few PCI-E 1x slots on a Socket A motherboard some time, as VIA's PCI-E-enabled VT8251-southbridge is pin-compatible with the older southbridge-chips, so it could be used in conjunction with a KT600 or KT880 Northbridge, if a motherboard-manufacturer decides to do this.QUOTE
and i see that video cards are about to have pci-x versions.
All of the upcoming next-gen cards(i.e. Radeon X800 and GeForce 6800) will be AGP 8x cards. PCI-E versions will follow soon, but initially, there won't be much of a difference in performance between PCI-E and AGP versions.
By the time there are only PCI-E cards, you will most likely need a more serious upgrade anyways.
Note: The correct acronym for PCI-Express is 'PCIE
' is actually an enhanced version of the PCI-bus(64-bits wide and with MUCH higher clockspeeds) which is used exclusively on Server/Workstation platforms.
This 'enhancement' became necessary to accomodate for high-bandwidth add-on cards such as Gigabit-Ethernet adapters/10GbE-adapters and multi-channel SCSI/RAID-cards.
' ">http://www.pcisig.com/specifications for more info
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