Seti machines running AMD chips at stock speed, how do I change multiplier??

[Wiz]

I want to boost these as much as possible, can't fiddle with FSB on my mobo of choice so I need to change the multiplier. I saw a post by Confused about this using a pencil and I have an 1800+ here and a 1600+ on the way.
I'd like a simple step by step and so I'd like to get on with this asap. Thanks!

 

[mechBgon]

You fill the laser-etched pits on the CPU and then connect bridges as desired to code in the multiplier. I found a useful guide to what bridges to connect or cut here (this is specifically for the XP's). As for the specifics of filling in the pits and connecting/cutting the bridges, I'll make way for Confused or someone who's actually done it.

 

[CADsortaGUY]

I unlocked my XP1800

I just masked off the L1 bridges..and the little triangle then used a toothpick to fill the little lasercut trenches with superglue. once the glue dried, take the tape off and use a razorblade to "smooth" it. once that is done just used a trace pencil or some rearwindow defogger repair paint(i used it - it works ) to connect the traces across the trench you filled in - be sure to not let them touch each other or the triangle or it might not work.

The above will only work if you can set the multiplier in the bios - I know there is a way to "hard" lock the multiplier but i haven't done it.

CkG

Oh yeah - you might want to use a magnifying glass those trenches are small and so are the bridges:Q

 

[Wiz]

I don't believe my mobo has a way to select multiplier in bios - Do you know mechBgon? (A7N266-VM)

If that's right then I would need to choose a multiplier and "lock" it.
That presents two problems:
Which multiplier to choose and how to lock it. Then what if it won't run stable at that speed?

 

[mechBgon]

Wiz, use the interactive guide here and it shows you what bridges need connecting, and what bridges need to be unconnected, for a particular multiplier. You can kick the voltage up via the bridges too.

The A7N266-VM is the consumate AMD-based office-computer board IMHO, and doesn't offer multiplier manipulation in the BIOS (unless that new 1004 BIOS adds it, haven't worked with that one). If you set the multiplier higher than the chip can go, then I think you have to undo your "bridgework" and try a lower one, or bump the voltage.

One possible method: throw the CPU into an overclockers' board to see what it will run at, then hard-code it for the necessary voltage and multiplier and put it into the A7N266-VM.

 

[Wiz]

Mech, good idea except I don't know anyone locally with a set up like that for testing my chips.
Thanks for the links