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Old 08-26-2003, 01:00 PM   #1
Bigbadger
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Question L12 mod fact or fiction????

I've been reading all about this L12 cutting mod which converts 166FSB (333DDR) cpu's to 133FSB (266DDR) and which according to the story makes em overclock better (personally I've never had any problem o/cing my un-cut XP2500+ to over 220FSB on my NF7-S V2.0).
Now while I fully understand how the mod changes the default FSB I have never heard a half plausible theory as to how this could improve the ability to run high FSB's (what difference could it make if you override the default FSB in the bios anyway?)
To add to my sceptisism the stories about the effects of this mod vairy wildly, I've even read claims that people have gained higher FSB's by doing the 'mod' on cpu's that were 133FSB by default in the first place!

My questions are:
1. What are your experiences of this mod.
2. If you believe it works how do you explain it
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Old 08-26-2003, 01:03 PM   #2
twiggy
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1. I know it works on older NF7's(rev 1-1.2).

2. N/A
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Old 08-26-2003, 08:56 PM   #3
DriveEuro
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I did it on my rig in the sig.. I only gained 2mhz.... I dunno, didn't give me the results that other people claimed.
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Old 08-26-2003, 09:20 PM   #4
dmon
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Worked great for me I could'nt get my 2500 stable above maybe 195 fsb and i had to crank up the vcore. I blew the bridge and right up to 11x200 @ default vcore. I run @ 217 now. I have a 1.2 and thought this was fixed with ver 2.
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Old 08-26-2003, 09:27 PM   #5
DriveEuro
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Yeah, but did you do the VDD mod? Cuz 1.2s have a horrible time getting to or above 200fsb. I know, I had two 1.2s. Dmon, to get over 195 all you had to do was do the vdd mod.
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Old 08-26-2003, 11:49 PM   #6
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Quote:
Originally posted by DriveEuro
I only gained 2mhz....
I would say 2MHz is within the 'margin for error' and it ammounts to no real gain at all (could just as easy been down to re-seating the cpu with new thermal paste)....I think the story goes that the 333FSB 'problem' was fixed on the Rev 2.0 boards anyway.
It's looking like there are plenty of people who believe in this mod but not one who can offer a plausible expanation for it.
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Old 08-27-2003, 02:54 AM   #7
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worked for my gigabyte board but not my asus....
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Old 08-27-2003, 03:17 AM   #8
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1. I believe ppl who use FSB 166 XP's as duallies cut the L12 bridge to run at FSB 133. So yes.

2. Haven't heard anything about this...
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Old 08-27-2003, 07:02 AM   #9
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1. It's work (before mod max bootable fsb was 225 after max bootable is 245MHz) Stable is a bit little (242 in Prime - RAM asynchr)
2. It may be something like 4 or 5 bit multiplayer (up to 12,5 or 22)
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Old 08-27-2003, 08:27 AM   #10
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Quote:
Originally posted by yotomeczek
1. It's work (before mod max bootable fsb was 225 after max bootable is 245MHz) Stable is a bit little (242 in Prime - RAM asynchr)
2. It may be something like 4 or 5 bit multiplayer (up to 12,5 or 22)
Thanks for the feedback...however, your XP1700 is a 266FSB cpu already, so the L12 would be 'factory' cut...There is really no way cutting it some more can make any difference to anything????

L12 does not effect the 5th bit multiplier control, only the default FSB (open =266FSB, closed = 333FSB). The 5th bit multiplier is already taken care of on any NF7 board, so sorry, this cant explain it.
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Old 08-28-2003, 10:07 AM   #11
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I did the L12 mod on both my xp2100 tbreds. Gained between 10-12Mhz. i say that isn't bad. Took me all but 10 minutes to do the wire trick.
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Old 08-28-2003, 11:06 AM   #12
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Quote:
Originally posted by Nebulous
I did the L12 mod on both my xp2100 tbreds. Gained between 10-12Mhz. i say that isn't bad. Took me all but 10 minutes to do the wire trick.
Errr...correct me if I'm wrong but as far as i know there is no way to do the L12 mod with wire. The 'Wire Trick' is as far as I know only to access the 'hidden' multipliers on motherboards that dont have the 5th bit multiplier control.
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Old 08-28-2003, 11:32 AM   #13
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Quote:
Originally posted by Bigbadger
Errr...correct me if I'm wrong but as far as i know there is no way to do the L12 mod with wire. The 'Wire Trick' is as far as I know only to access the 'hidden' multipliers on motherboards that dont have the 5th bit multiplier control.

http://www.xtremesystems.org/forums/...threadid=15300

What I did was instead of painting the 3rd L12 bridge, i used the wire trick. I took a strand of telephone wire and looped it underneath the cpu's pins to close the L12 bridge. Thus making my xp2100 Tbred B Into an XP2700 (333) chip. Weks like a charm



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Old 08-28-2003, 11:53 AM   #14
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OK, now I understand.
I was really thinking about people who had done the opposite ie. converted 333FSB cpu's to 266 by cutting the bridge.
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Old 08-29-2003, 03:22 PM   #15
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Bfeore L12 mod 225 stable
After 233 Stable

Nice difference for an easy mod ( I soldered wire to backside)

Why it works I have no Idea.
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Old 08-30-2003, 08:05 AM   #16
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It just tricks the bios so it thinks it can run faster is my guess.
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Old 08-30-2003, 08:22 AM   #17
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Quote:
Originally posted by Techmasta
It just tricks the bios so it thinks it can run faster is my guess.
Hmmm...I was looking for something a little more technical....why should the bios 'think' a 266FSB chip can run faster than a 333FSB one?...If anything you would expect it to be the other way around.
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Old 08-30-2003, 09:25 AM   #18
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Well it "thinks" it has more overhead because it "thinks" it has a 333fsb cpu in it instead of a 266. I don't really konw thats just my guess. If I find something more technical I'll post it.
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