How to change AthlonXP 1600+ multiplier?

[dejacky]

I want to overclock my athlonXP 1600+ to 1800+ speeds, but my motherboard does not have any multiplier adjustment settings (ECS K7S5A). Is there a not-impossibly-difficult method to physically change the multiplier of my cpu? Thanks in advance.

-dejacky

 

[johncar]

Originally posted by: dejacky
I want to overclock my athlonXP 1600+ to 1800+ speeds, but my motherboard does not have any multiplier adjustment settings (ECS K7S5A). Is there a not-impossibly-difficult method to physically change the multiplier of my cpu? Thanks in advance.
-dejacky

Yes a very easy way....here's what you do...
Close the 2nd, 3rd and 4th L1 bridges from the left with conductive solution like rear window defogger wires repair material, but do NOT insulate the pits, in fact be sure that the conductive material DOES make contact with the sub-surface ground plane. Here's the tech basis for this mod....which only works this 'easily" because you only have to reset some Bit Values from HI to LO...other way round not so easy, have to open/close the L3/L4 Multiplier bridges.

1600 = 10.5X default Multiplier which has the .5X, 1X, 2X, and 4X Bit Values set HI.
1800 = 11.5X which needs only the .5X Bit Value set HI.
So if you "reset" the 1X, 2X, and 4X Bit Values to LO, then the cpu is converted to an 1800...and shorting those 3 signal busses to "ground" as described above should do the trick...reset LOs.

LI Bit Values from L to R = .5X, 1X, 2X, 4X, 8X. For more "detail"....
http://www.beachlink.com/candjac/index.htm link to understanding Multiplier Code article, and/or Palomino article...lots of marked up pics and diagrams.
John C.

 

[dejacky]

wow, thanks for the informative answer johncar. Would using THIS method on the L2, L3, & L4 bridges also work? Also, I have one of the very early AthlonXP1600+'s, is it assumable that it should be able to run at 1800+ speeds Stable? My cooler is ThermalRight SK6 with 7000rpm Delta Fan.


-dejacky

 

[johncar]

Originally posted by: dejacky
wow, thanks for the informative answer johncar. Would using THIS method on the L2, L3, & L4 bridges also work? Also, I have one of the very early AthlonXP1600+'s, is it assumable that it should be able to run at 1800+ speeds Stable? My cooler is ThermalRight SK6 with 7000rpm Delta Fan.
-dejacky

Re THG table of open/closed bridge settings.....
Why would you want to mess with L1, L3, L4 bridges, opening and closing them?? What a restoration mess in case the oc turns out to be too high and the system won't boot. We won't even talk about it.;-)

Look...there is also a more restorable way to "reset" the 1X, 2X, and 4X Bit Values to LO, so that the cpu is converted to an 1800, and shorting those 3 signal busses to "ground".

Instead of filling those 3 L1 bridges' pits with conductive solution, (as we posted above, and which might be a mess to clean out the conductive material from the pits), simply connect all 3 "lower dots" of those L1s to a "surface ground" on the CPU. Any nearby surface lettering or icons are reported to be at ground level. For example, simply start at the 2nd from left lower dot, then connect to 3rd, then to 4th, then to the letter "L" in the "L3" label to the right and slightly below, being careful to not connect to any other bridges or dots on the way to the "L3". This then also shorts those signal busses to ground, but as you can see, is easily restorable by simply scraping the trace between the 4 items you've connected.

Have no idea how high you can oc your chip...but isn't this all the more reason to mod your chip in the way that is the easiest to restore in the case of oc'g failure??
John C.
PS:- Edit, Always lightly scrape clean any surfaces you'll be connecting with conductive material 'cause lately we're hearing that bridge dots etc might be covered with an insulating film...so better be safe than sorry.

 

[dejacky]

Is using one of those "conductive pens" a good idea or is the window defogger thing the easiest way?

-dejacky

 

[johncar]

We've used both and prefer the defogger material. It dries a bit too quickly, so you have to work fast, but with fine pointed applicator like a very fine needle or wire etc you can make narrower lines. Suggest you experiment on another pcb surface.
John C.

 

[dejacky]

AthlonXP 1800+ is 1.53ghz whereas the AthlonXP 1600+ is 1.4Ghz. I don't think the chip should have a problem running 130mhz higher consider the great cooling I'm using.?

-dejacky

 

[tritium4ever]

You guys all forgot one thing: the K7S5A doesn't have multiplier control! At least not without some hardcore modding of the board...

 

[johncar]

Yes, XP1800 ought to be achievable...lots of posts up as high as 2000.

And tritium....connecting the lower dots of L1 bridges to surface grounds "is" hard modding. Read some of the articles at
http://www.beachlink.com/candjac/index.htm to understand AMD's Multiplier Code and then you can figure out all the different ways to mod cpus when you know the code.
John C.

 

[jiffylube1024]

Originally posted by: tritium4ever
You guys all forgot one thing: the K7S5A doesn't have multiplier control! At least not without some hardcore modding of the board...

tritim4ever remember - if you mod the CPU's multiplier, then you don't have to do anything to the motherboard. It will read the CPU's built in multiplier (which will have been changed in this case from 10.5X to 11.5X) and run at that speed. 11.5X *133 MHz FSB = 1.53 GHz; Athlon XP 1800+.

 

[johncar]

Originally posted by: jiffylube1024
tritim4ever remember - if you mod the CPU's multiplier, then you don't have to do anything to the motherboard. It will read the CPU's built in multiplier (which will have been changed in this case from 10.5X to 11.5X) and run at that speed. 11.5X *133 MHz FSB = 1.53 GHz; Athlon XP 1800+.

Not to be picky, just to clarify the signalling arrangement......

Northbridge gets Multiplier "ID" info from the CPU via "another" (FID) set of pins. The Multiplier signals set by the bridges on CPU surface go "directly" to the Multiplier module inside the CPU. Mobo/bios only sends "over-riding signals" to CPU via closed L1 bridges, but does not "read" what is set on the CPU..obviously when you consider that L1s are "open" on many chips.
John C.

 

[pdo]

can you do me a big favorJohncar? I have an XP1600+ and I wanna change multiplier 11.5x. which which L1 bridge do I need to closed? thanks in advance.

 

[johncar]

Originally posted by: .paldo
can you do me a big favorJohncar? I have an XP1600+ and I wanna change multiplier 11.5x. which which L1 bridge do I need to closed? thanks in advance.

More than 1 bridge is involved...and we're assuming you have a mobo /bios with NO oc'g support.

Also then the L1 bridges are not involved, user must re-arrange the L3, L4, L10 bridge pairs...(if and as needed). Believe that for your purposes, you should go to oc-inside.de . Find Jens' interactive Multiplier setting page for Palomino's. There you enter desired Multiplier and the page prints out the open/closed pattern of the L3/L4/L10 bridges. Then you compare to what you have on the 1600 and open and close the ones you need to change to match your desired Multiplier. But warning, opening and closing those bridges has led many users into lots of grief...it's not easy. But if you insist, also input the 1600's 10.5X to verify that it matches what you have on your 1600...builds confidence in the data you are being given. Though we've checked Jens' page and always been accurate.
John C.

 

[MustangSVT]

johncar u seem to have some experience with this so ill ask some questions..

i also have k7s5a with agoia Y 1600+ and from just fsb overclocking it does run stable @ 148 fsb.. but with my DDR 2100 memory, i cant go any higher.

since i cant chance multi or vcore from bios, i plan to change the bridges on cpu itself.
my plan . sorta

im thinking about setting multi to 13x and give some more juice to the cpu (1.8v from original of 1.75v).
then run memory on fastest cas and ras and run cpu @ 133 or 138fsb .

here are my questions.
1. from the link above, confused claims he used "mechanical pencils" to complete the bridges and it worked... but i thought type of surface on XP prevents that? will it work?
2. if that doesnt work, i was thinking about just cutting the necessary bridges and connect them with thin wires (taping it so it stays put afterwords), will that work?
3.is 13x multi going to work? for some reason lot of ppl dont go over 12.5 x.?
4.why dont u enable ur private message?

thanx in advance.. btw.. i might get impatient and try the steps today

 

[johncar]

Originally posted by: MustangSVT
johncar u seem to have some experience with this so ill ask some questions.

since i cant chance multi or vcore from bios, i plan to change the bridges on cpu itself.

im thinking about setting multi to 13x and give some more juice to the cpu (1.8v from original of 1.75v).
then run memory on fastest cas and ras and run cpu @ 133 or 138fsb .

here are my questions.
1. from the link above, confused claims he used "mechanical pencils" to complete the bridges and it worked... but i thought type of surface on XP prevents that? will it work?
2. if that doesnt work, i was thinking about just cutting the necessary bridges and connect them with thin wires (taping it so it stays put afterwords), will that work?
3.is 13x multi going to work? for some reason lot of ppl dont go over 12.5 x.?
4.why dont u enable ur private message?

Our experience is mostly in researching the Multiplier circuits and bridges for how they are designed and operate, and we've only used conductive pen and the defogger repair kit material.

So can't respond from experience to the pencil question. We'd "guess" that it would be more difficult than the conductive solutions.

Taping on thin wires has the problem of maintaining enough pressure to assure stble contact over long periods of time...sounds too "iffy".

13X operation seems to depend on how the mobo/bios maybe Northbridge respond to that setting. You're aware that specifc new mods have to be applied to 13X 2100 and 13.5X 2200 else the systems won't post. And when that mod is implemented the sytems boot and users have control of 5X thru 12.5X but can't set any thing higher...no one knows why...but they make up for it with very high FSB. Maybe that's what you're referring to. Don't know if anyone has modded a chip lower than than 13X to 13X then tried it, but we'd guess that the same mobos that reject default 13X/13.5X would also reject a modded 13X.

Feel more comfortable with email.
John C.