You would be FAR better off with the DDR ram Motherboard and 32 MB radeon. For the most part spending extra money for 64 MB of video memory is at this time pretty much a waste of money. There are no games yet available that need that much video memory and unless you have say a 21 " monitor and plan at running at ungodly high resolutions, don't bother.
You must also consider that in a years time sdram may not be available (or very expensive) and DDR ram is cheap. DDR ram will also give better performance now, and more so in the future as processor speeds increase. My advice is to sell that ram to somebody and get yourself a DDR ram board. (Asus A7M266 and A7V266 would be good choices. If you wait until the end of next month the Asus A7N266 will be available and be likely FAR faster than the other two. It will also be expensive (approx $200). )
If you must buy a system before the end of September, get yourself an AMD 760 chipset based one if you want top performance and proven stability. The Via KT266 has two advantages though over the AMD 760, it is much cheaper, and supports overclocking. Performance is also pretty good on the kt266 (within 1% of the AMD 760). Early reports indicate it is also very stable.
Basically here's how I see it:
For people who like to overclock - VIA kt266 board.
For people who don't overclock - AMD 760 board.
For those who won't be buying a system until end of September / mid October - Nvidia nForce (not yet available).
(Btw: You can't use SDRAM in DDR ram slots.
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