How do i lock pci and agp??

[Dantrag]

how do i lock pci and agp on the kt4 ultra?

 

[Rick]

What do you mean by "lock"?

Lock the PCI/AGP bus speed?

 

[Didou]

You should read posts...

Taken from : https://www.techspot.com/vb/showthread.php?s=&threadid=7469

On VIA boards, you can't lock PCI/AGP speeds, you can simply select different dividers.

The lowest on KT400 boards I believe is 1/5, thus running your FSB at 166 will give you 33/66 for PCI/AGP. I don't know if there's a 1/6 divider available, which could help alot with your OCing adventure.

 

[Dantrag]

but has anyone info i cant find the deviders or are pci irq's the same ?

 

[Didou]

Taken from -> http://www.xbitlabs.com/articles/mainboards/display/msi-kt4-ultra.html

After checking all the options in practice, we can state that the entire range of FSB frequencies up to 233MHz is working, that is, the mainboard is stable at any FSB frequency up to 233MHz. Overclockers should really enjoy it and continue the AMD's initiative about raising the FSB frequency of their Athlon XP above 166MHz. But at 166MHz FSB, the memory in MSI KT4 Ultra can be clocked only synchronously due to the restrictions in the VIA KT400 chipset. Moreover, the minimum divisor of the PCI bus that's activated at the FSB rate over 166MHz is 1:5. So, when overclocking the FSB above 166MHz, the system may lose some of its stability because of certain problems with the memory or expansion cards.

So it seems, there shouldn't be a problem under 166mhz but above that, the board will use a 1/5 divider which you cannot change.

 

[Mictlantecuhtli]

With some boards you can't choose dividers either, they're locked, like in my motherboard (MSI Pro266TD-LR). AGP is 1/2 and PCI 1/4, FSB default 133 MHz.

IRQs have nothing to do with this.

 

[Dantrag]

:S looks like i'm gona get a new mobo then
what's the best overklocking amd board?