[deliveryman]

AMD Barton XP 2600+
ASUS A7V600 mobo
512 DDR RAM (don't know the make)

FSB x Multiplier = CPU speed, right?

So I was fooling around, trying to OC as far as I can go.

And I got to 188 FSB and a 15 multiplier, which equals to 2.82ghz

Though when I checked to see what my system was running at, it said 2.15 ghz?

[I.M.O.G.]

188*11.5= 2.15

The barton you are overclocking is multiplier locked, so you can change the setting for the multiplier, but it will not actually change.

Note that you will likely not be able to make it to 2.8Ghz.

[deliveryman]

is there a way to unlock my multiplier?

[The Coolest]

You can't unlock it, but there's a work around.
You will need to connect two bridges on your CPU, then you will be able to change the multiplier using software.
Only it will not work on an nForce2 motherboard if you ever get one, so you'll be stuck on x11.5 multiplier. But on your current board there should be no problems

[c627627]

No:
http://www.ocforums.com/showthread.php?t=244237
But in your case there may be a work around:

Basically, the method involves modding of the locked chips.

'PowerNow' feature allows voltage and multiplier changes in order to preserve battery life.

So if you have motherboard/chipset/BIOS support for PowerNow which not all boards do, nForce2 does not, you can use this feature on locked desktop CPUs.

You also need to boot into Windows with your locked multiplier and the FSB with which you can boot into Windows but you cannot change the FSB inside Windows, only the multiplier. Ironically, you can change the FSB too inside Windows with nForce2s but they have no PowerNow feature so it's of no use with super locked chips.



So with this so called super unlock method, remembering that MHz Speed = [FSB] x multiplier

FSB can be changed only before you boot into Windows but
multiplier can only be changed after you boot into Windows.

...with limited success so far.

It's not a real unlock at all.

Originally posted by stamasd
1. closed L5, 2nd bridge from the right with pencil

2. cut L8 for 1.5V according to the mobile chart (same as L11 for 1.6V), i.e. C:C:C (see notation on Fab51's page); actually I may have cut the first (from the top) bridge on L8 as well, because CPUMSR shows a default volytage of 1.45V instead.

3. cut L6 for a max multiplier of 19x. Why 19x? It's high enough that you actually never get to use it, and it's very easy to do, the highest multiplier which can be set with just 2 cuts :CCC: - in other words, cut the top and the bottom bridges on L6.

That's it. It just works, on a A7V600 mobo. It's simple enough that I will probably mod the same my other CPU, an unlocked XP2500+. I've began to like changing multis from within the OS, and I don't see any downside to it. For use on the A7V600 I'll probably even leave out the L8 cuts altogether, since I set the Vcore manually in the bios anyway, and the "default" Vcore means nothing. *NOTE* the L8 cuts may be required on other motherboards, if they read it - you don't want to accidentally push 2V in your chip. Also note that cutting bridges on L8 will not change the voltages needed to run the CPU - if before the mod it needed 1.8V to reach 2200 MHz, it will still need the same 1.8V after the mod for the same speed.

For a locked Barton? I dunno, probably the same. The only thing that may be different is the location of the L8 cuts, if you want to set a different default Vcore. IMHO there's no need to do all 5 cuts for L6, I can't imagine a setup where you'd want to use a multiplier higher than 19X on these chips. Unless you push the FSB down to 100MHz of course.