Like I mention in <A HREF="http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&p=399444#399444" target="_new">THIS</A> thread, it depends on what your plans for upgrades are.
Are you building a fresh rig with an eye on the future (not to replace the mobo for a while? If so wait for PCI-EX, it will give you more longterm options.
If you are simply building a computer now, with the possibility of another complete upgrade in a year or so, stick with AGP. Then you can buy a mature PCI-EX mobo to go with your next card.
No matter what you will be replacing whatever you buy this summer with a PCI-EX card next time, so the question is whether you want to buy a brand new mobo with very nascent technologies/parts/chipsets, or whether you want to wait for those issues to reach maturity and buy a mature MOBO and graphics card NEXT time. Considering your current MOBO, I'd say stick with the short term because if you're already thinkng about upgrading what yo have now, then you'll likely be looking at a new mobo and graphics card by this time next year also.
The safe thing is to go AGP, the forward looking but riskier thing would be PCI-EX.
I'm going the risky route because I don't mind testing the waters, and maybe I'll keep my mobo for 2 years, I've been waiting about 2 years for the Clawhammers to get here, so we'll see. Still haven;t decided which chipset is the most future 'proof' though, just some personal observations about the chipsets and sockets.
Of course, what do you want to spend your money on, some people need to move from an R9700Pro to an R9800Pro to and R9800PRO-256 to an R9800XT. Those people (which you may be among) just keep upgrading all the time, and thenit would simply come down to top performance, and upgrading every 6months makes little difference. If that's the case, get the X800Pro now, and then sell it once the right PCI-EX solution comes along to replace it and your mobo.
Hope that helps somewhat.
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