Actually, I've found my nForce/Radeon combination to be rock solid. I'm expecting my R300/nForce2 combination I should have soon to be just as stable and agile.
Frankly, the Radeon 9700 is the only way to test AGP8x performance at the time of the article. I'm waiting to see who gets the first NV15/18 and 20/22 (4ti?) comparison out to see if the added bandwidth really does work.