My first post was written while I was engaged with another activity, not as focused as I should have been. Anyway, the PCI-E slot on your board is a PCI-E X4, therefore it only uses 4 lanes and purchasing a borad with 8 or 16 lanes will work, which is what I intended to state in my first post, but will only use the 4 lanes available. My choice would be to use a PCI-E instead of an AGP card, as a final thought.
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Windows 7 Professional x64Intel i5 quad processor16 GBRadeon HD 5770
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Basicly PCIE x16(x4)is used for crossfireX and SLI, so the master card uses the PCIE X16(x16) and the slave card uses the PCIE X16(x4) because it doesnt need as much power, it is advised to if you only run 1 card to run it in the PCIE X16(x16) slot
My Computer
At a glance
Windows 7 Ultimate x86Intel Pentium D 925 @ 3.00GHz1GB DDR2 667MHzOverclocked Asus ATI Radeon X1600 Pro 512MB
Computer Manufacturer/Model Number
Packard Bell iMedia 2218 -- Has Been Running For Almost 7 Years!
It has both an AGP X8 slot, and a PCI-E X16 slot (which is limited to four PCI-E lanes, rather than 16). I'm not sure how much that would limit the performance of a high-end PCI-E X16 graphics card. That's irelevant; no one would plug a $500US 300W card into such a system.
PCI-E graphics cards are a lot easier (and cheaper) to come by than AGP, so if you want to buy a new card, go with that.
The chipset is Via. (That explains the weirdness.) I see that Asrock has Windows Vista drivers for it, so it's possible that Win7 would support it.
My Computer
At a glance
Windows 7 Pro X64 SP1Intel Core I7-3930k16 GB Gskill DDR3-2133eVGA GTX680