Your AGP clock is locked at 2/3 FSB at 100 MHz FSB and higher. The Riva ZX might be puking itself. According to the quickstart guide I just downloaded for your board, the PCI bus is somewhat adjustable to keep it between 30 and 41 MHz. From 100 to 120 FSB its a divide by 3, and above that it varies. I don't know about the Highpoint Ultra 66 controller on your board, but the CMD on the Asus CUBX gets flaky above 37. Dig out the chart on page 13 of your quickstart guide and review the numbers. Start by removing all cards and put an ISA video card in. Move your hard drive to the standard Ultra 33 controller. Bump up the FSB one tick at a time till it dies. You have just reached your *memory* or *cpu* limit. Now, you can put the AGP video card back in and repeat these steps, starting with 100. Now you will find out the video card limit. Put the ISA video card back in and repeat with the hard drive on the Ultra 66 and you will find out *its* limit. You may have to skip forward to get a good reading on this because of the PCI speed variability above 120 and the Ultra 66 controller is going to be driven by the PCI bus. Using this process you should be able to get a good idea what is the limiting component and just how high you can go. Hope this helps!
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