ZX MB at 133Mhz ?

[tmodjeska2001]

I'm putting together a PIII 450 with a BIOSTAR M6TZA ZX M/B..
In the BIOS setup, I was able to choose from a selection of FSB/PCI speed options. These options were: 100/33 , 112/37, 124/31, and 133/33. Everything worked great until I decided take out the Savage 4 AGP card that I got with it and try my old TNT card. Windows would hang at the splash screen so I dropped the FSB to 100/33. Windows STILL hanged at the splash screen. Then I popped in an old Matrox G100, thinking I burnt out the TNT, and tried it again at 100/33 but it still hanged at the splash screen. I took a close look at the Savage 4 card and noticed that pins B66 and A66 were cut. Can someone please enlighten me as to what is going on? I have never before encountered something this odd. Does the pins on A66 and B66 have something to do with being able to safely run the AGP cards on a 133 bus?

 

[AndyHui]

No, but the 440ZX chipset does not have a 1/2 divider at 133MHz FSB. At 133MHz FSB, your AGP is running at 89MHz, not 66MHz. I'm not surprised that your video cards are not running at that speed.

 

[tmodjeska2001]

My video cards turned out to be fine, I just got them to work in my SOYO BX board and tried running my Celeron at 83 Mhz. I cant get the BIOSTAR to boot with any video card at any bus speed except the Savage4 with the Pins cut.. so I am thinking that this is what I need to do to get my other cards to work.

 

[vec]

Some of the older video cards can't handle the 89Mhz agp bus speed when you set your mobo to 133mhz fsb.

Your savage card that works may just handle the faster agp bus better than the others. Those pins you mentioned *may* not be the reason why.

My voodoo 3 and geforce2 can handle a 89mhz agp bus, but my tnt and savage 2k cannot.