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Topic Title: XP-Mobile and locked PCI/AGP dividers
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Created On: 06/05/2004 07:37 AM
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 06/05/2004 07:37 AM
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Junior Member

Posts: 1
Joined: 06/05/2004

Recently I installed a new motherboard (Aopen AK77-600 Max based on VIA KT600) and the excellent XP-mobile 2400+ processor (AXMH2400FQQ4C). The unlocked multiplier and adjustable vCore are incredibly cool to play with, and CrytalCPUID PowerNow real-time throttling in Windows is really great!

Unfortunately I have some problems with FSB dividers.

Mobo BIOS does not recognize the CPU ("Unknown CPU type") and sets it at 6 x 100, which is common as far as I read in other posts. I can freely set FSB and multipliers, both within BIOS and Windows. My motherboard never changes PCI/AGP dividers that stay locked at 1/3 and 2/3!

In other words, if I try to set 133 Mhz FSB (factory specifications of XP-M 2400+) the PC does not boot because of PCI bus set at 44 Mhz.

On AK77-600 Max there's a "K7 host clock" jumper which has two possibile values: "auto detect" and "100 Mhz". None changes the board behaviour. My BIOS revision is R1.08 and I have two 512 Mb DDR400 RAM modules; the board uses a Cypress W312-02H clock generator.

Do you know of any hack or trick to solve this situation?

Thank you and bye from Italy
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