All About Which Bridges Do What, Stop Misinformation

[John C.]

See quite a few posts with misinformation about which bridges do what. one recently posted that L1 bridges set the Multiplier...completely wrong. So here's the correct info about which bridges AMD uses to set the default Multiplier.

Duron/Tbird = (4) L3 + (4) L4 as (4) HI/LO Pairs.

Palomino = (4) L3 + (4) L4 + (2) L10 as (5) HI/LO Pairs.

Tbred = (5) Individual L3. Open = HI, Closed = LO.
Do not compare to Duron/Tbird or palomino L3s.

L1 bridges do NOT have anything to do with setting the Multiplier's Value when they are "closed correctly". All closed L1s do is allow the "mobo/bios" to over-ride the default Multiplier HI/LO signals set by the above bridges on the cpu...IF the mobo/bios has that capability in the first place.

However, IF the L1s are "not closed correctly", such as one or more still open, or one or more shorted to ground, or adjacent L1s cross-connected, THEN the system will generate some "unexpected Multipliers" different than what is being reset by the mobo/bios, and in some L1 closing failures even change the default Multiplier setting. But repeat, the* unexpected results happen because of failures in closing the L1s.

For those who'd like to explore the Multiplier bridges and the effect of L1 closing failures in more detail, also a completely marked up pic explaining the above....
http://www.beachlink.com/candjac/index.htm link to Understanding Multiplier Code article....and others.
John C.

[deathstar13]

that is exact info i nbeen looking for john thank you!
mabey its the migrain i ben fighing but is it possable to see if im getting this correctly.

all the multiplier settings on tbreds are on the L3? and i assume the L1's must be all closed also in conjunction for the differant L3 bridge settings to take affect?

that looks like the way u explained it.
and if this is so its gonna be a pain in the wazoo to keep pulling the cpu just to change a multiplier. and the bios will loose all function to change a multiplier.oh well least its not locked!

please correct me on any of this.i cant wait to start doing surgery on a $300 cpu!

[John C.]

>You wrote...
is it possable to see if im getting this correctly.
>all the multiplier settings on tbreds are on the L3?

Yes

>and i >assume the L1's must be all closed also in >conjunctionfor the differant L3 bridge settings to take affect?

No...the L1s must all be closed only to allow the circuits in the mobo/bios to over-ride/change the default settings made by the L3s. If you leave the L1s open then the system should boot at default setting, but then there is no way for the mobo/bios to "change" the deault Multiplier.

>that looks like the way u explained it.

No, that's not the way it was explained., read it again.

>and if this is so its gonna be a pain in the wazoo to >keep pulling the cpu just to change a multiplier. and >the bios will loose all function to change a >multiplier.oh well least its not locked!

If your mobo/bios is able to reset the default Multiplier,
then it's not a pain at all, simply close the L1s and make the settings you want in the bios. Of course, the settings you make should not oc the cpu to the point where it cannot possibly run.

If your mobo/bios is not equipped to change settings then you are out of luck...you have to make changes to the L3s, and it makes no sense then to close the L1s since there are no circuits on the mobo to connect to for changing the Multiplier.

>please correct me on any of this.

Hope it's all clear now...if not go to the articles we linked to in original post.
John C.

[smudged]

cleared up a few things for me thanx