KT400 w/ 1/6 divisor?

http://www.tech-report.com/reviews/2002q3/kt400-dragon/index.x?pg=3

says it has a 1//6 divisor selection. I wonder if it works?

Nope.....

How does a chipset disallow a divider? The NB isn't on the PCI bus.

bios

umm... then manufactures could program it into their bioses, some did w/ the KT 400 and it wouldn't post. If it's a chipset limitation, it must be hardware, unless they are just misleading us to sell KT 400A boards.

unless they are just misleading us to sell KT 400A boards

Click to expand...

Yep....

Only board on the market with a working 1/6 is the one in my sig.

iwill? never really heard of them...

I own an XP333 as well. It's certainly a tweaker's board, as its performance with an older BIOS and without tweaking is not exceptional. But I like the board despite mine's lack of multiplier control.

I downloaded the KT400 Dragon Ultra's BIOS from Soyo's website to see what I could see about PCI dividers. Want to know what I found?

In the BIOS's section for the dividers, it has values ranging from /3 to /6. However, the /6 is not selectable by default.

I don't know what to think about this. If someone around here had the KT400 Dragon Ultra I could mod the BIOS and get them to test it, or tell them how to do it themselves. If the board does indeed have a working 1/6 divider, it would be a really cool find for the whole overclocking community.

Edit: Just downloaded the BIOS for the KT333 Dragon Plus and the same options are there, just non-selectable. WTF?

There is a bug with the KT400 NB that will not allow the 1/6 divisor to run properly. You need an extremely clean signal for this to work & some motherboard manufacturers tried to enalble this & have failed in doing so, reason for the first BIOS update removing this option. VIA also never claimed the KT400 of having a 1/6 divisor, all their roadmaps showed support for DDR333 only & Asynchronous running of DDR400. This is a lost cause.

KT400A has no working 1/6 divisor either AFAIK.

That doesn't really answer my question. How can a bug in the NB affect PCI divisor's? It's not on the PCI bus, is it?

Sonny, that's some pretty interesting information. The KT333's BIOS also had the 1/6 there. If I had lots of money to throw around, I would give it a try, but... I don't.

Does anyone have a datasheet of the KT400 NB that shows pin mappings and such? Also, an older version of my board's bios had a 1/6 option, how can I re-enable that (of course, no board would post with it enabled, but I'd like to see it just for kicks (and in case I try to feed a different pci signal to the NB). Can you recomend a good book on assembler?

Gnufsh, just for kicks I downloaded the latest version of your board's BIOS. I found that the 1/6 divider is in there, but it's not a selectable option.

For some reason I can't get modbin to save it when I enable the option. I think I must need to get a newer version of modbin.

Anyway, the option is still present. Don't know how adventurous you feel, but you could try enabling it.