The G3 CPU has ratios has high as 8x or 9x, so high CPU speeds can be obtained with lower bus speeds. As I said before, with the new G3 cards the above 50mhz bus speeds are not even an option anymore. It is also the basis for many of the published warnings on the net. Tech support is one of the most costly parts of a product sold to the general public. That's why good tech support is so rare in the current competitive market.
Tech support is often the first thing to suffer when cuts are made.
Overclockers take note, to my knowledge only PowerLogix currently stands behind the warranty on a overclocked CPU card. Based on my past discussions with them, they don't care how fast you run the card - if it fails in the warranty period, you're still covered. As they say, your milage may vary. If it concerns you, I'd stay within the limits of the design, and with today's G3 cards, it's a moot point - as most cards max out at 45mhz bus speed and don't need a motherboard cache at all. With falling prices I suggest skipping the whole Cache Dimm and Bus speed game of the 604E and just get a G3 Card.