Hey guys....
We also ran into the same problem when trying to oc Classic Athlons via the goldfinger on the Abit KA7. Anything under a gig worked fine with the multiplier, but setting it at 10x caused lockups. Somebody suggested that by turning off 4x AGP, the problem with the 10x multiplier would go away. Amazingly enough, it worked! Since 4x agp is really no big deal, I have never missed it. But to get the best performance out of my system, I backed off the multiplier to 9.5x, and upped the fsb to 108. This also raised the frequency of my memory bus to 144, giving much better memory bandwidth, and also raised my AGP bus to 72 mhtz .*** With the setup like this, I have found that enabling sideband and 4x causes some kind of conflict on the overclocked agp bus, so these options are best left unused.*** Often times lockups occur, and it appears to you that that it is because of the settings you have been constantly changing...ie cpu overclocking settings... when in fact the lockups may occur due to other parts of the system that you have set and forgot...ie AGP options. I did read an article (I wish I remembered where it was), that outlined the benefits of Sidebanding vs overclocking the AGP bus which leaned towards the overclocked AGP bus as more favorable than sidebanding. I realize that the difference between a KA7 chipset (KX133) and the KT7 chipset (KT133) COULD make all of this a moot point, but it wouldn't hurt to try it.
Athlon 850 @ 1028 1/3 L2 1.95 volts
Abit KA7
128 megs Mushkin Rev.2 PC-133 running cas2 at 144 mhtz.
Ninja Micros FreeSpeed Pro goldfinger
GlobalWin FKK32 Heatsink/Fans
Creative Annihilator 2 GeForce GTS