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Cant OC 2600+ on A7N8x
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  #1  
Old 11-08-2003
---agissi---'s Avatar
TechSpot Paladin
  
Location: Montana
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Cant OC 2600+ on A7N8x
Well my friend has a 2600+ TBred, on a Asus A7N8x, with a SLK900 and a ~35CFM Fan to go with it.

When I go into the BIOS to change the CPU multi,it wont go any higher then what its at now, 12.5. It'll go lower, but not higher.

I can change the FSB all the way up to 211, but it wont go much higher then 180 - Plus I dont want to up the FSB that much, I just want to be able to OC the CPU a fair bit (since a 2600 with a SLK900 should be able to).

Any ideas on whats causing me to not be able to change the Multi? I thought I read on the internet somewhere theres a jumper you have to change but I read the manual and it didnt say anything about a OC jumper.

The board is the Deluxe, v2.0.
  #2  
Old 11-08-2003
Nic's Avatar
Nic Nic is offline
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Location: UK
Member since: Jan 2003, 1,918 posts
Its a common problem with AMD's new *locked* CPUs. Basically you need a mainboard that can read the 5th multiplier bit, in order to access multiplier settings of 13x and above. The Asus A7N8X does not read the 5th multiplier bit. The only mobo that I know about that does is the Abit NF7-S v2.0. For possible solutions, take a look at this article (see reader update at the end) ...

Unlocking and Overclocking the Athlon XP

Quote:
"See with Athlon XP processors, (specifically Barton, I don't know about others) the 2500+ has the L3 bridge already closed, therefore you have access to multipliers 5.5-12.5 on most motherboards that allow for multiplier adjustments. (nforce2 for example).

However, a lot of the nForce2 boards do not read the 5th multiplier bit, so it will only give you a range of 5.5-12.5 OR 13 and up. Not all multipliers. SO with that bridge closed, you cannot select 13 or higher on a llot of motherboards. (specifically in my experience the ASUS A7N8X, but I believe this affects a lot more.)

So you have to CUT that L3 bridge to gain access to 13 and up. (That bridge is CUT for the athlon 3000+ for example.) So for people in my situation, (there are a lot of us in the nforcehq forums...) I am running PC2700 so I cannot get my FSB up to 200(x2), (175 (x2) Stable) soI would have to cut that bridge on my Barton 2500 to get access to the higher multipliers as I'm hitting the ceiling at 12.5, and I'm sure my processor will go farther than 2.19 with no voltage increase. Granted I COULD run in synchronous mode, but the performance hit on doing so is actually pretty large. More so than just leaving it as it is."
Last edited by Nic; 11-08-2003 at 07:35 PM..
  #3  
Old 11-08-2003
---agissi---'s Avatar
TechSpot Paladin
  
Location: Montana
Member since: Mar 2002, 2,304 posts
Thx Nic that was great, i figured out what is needed and how to do it
  #4  
Old 11-08-2003
Didou's Avatar
Bowtie extraordinair!
  
Location: Brussels, Belgium
Member since: Feb 2002, 5,895 posts
System specs
Quote:
"See with Athlon XP processors, (specifically Barton, I don't know about others) the 2500+ has the L3 bridge already closed, therefore you have access to multipliers 5.5-12.5 on most motherboards that allow for multiplier adjustments. (nforce2 for example).
Quote:
Well my friend has a 2600+ TBred
Make sure it works the same way for the TBred before you make that modification.
  #5  
Old 11-08-2003
---agissi---'s Avatar
TechSpot Paladin
  
Location: Montana
Member since: Mar 2002, 2,304 posts
Shall do Didou.. thx
  #6  
Old 11-12-2003
wicka_wicka's Avatar
Banned
  
Location: Bloomington, IN
Member since: Apr 2003, 179 posts
I know someone else who has an A7N8X Deluxe, and they can't even get their FSB above 200 because the board is holding them back.
  #7  
Old 11-12-2003
---agissi---'s Avatar
TechSpot Paladin
  
Location: Montana
Member since: Mar 2002, 2,304 posts
oh yeah ofcourse, it must be the board! geez - he should have got your Epox or Abit NFS-7.. cant believe he was dumb enough to get an Asus mobo! silly friend of mine.
  #8  
Old 11-15-2003
wicka_wicka's Avatar
Banned
  
Location: Bloomington, IN
Member since: Apr 2003, 179 posts
Wow, someone's picky today...I was just pointing out that you won't get it much higher because the board isn't very good with OC'ing...christ...
  #9  
Old 11-15-2003
Didou's Avatar
Bowtie extraordinair!
  
Location: Brussels, Belgium
Member since: Feb 2002, 5,895 posts
System specs
His OCing is limited by his Ram ( PC2700 ), not by the board.

& please watch your language.
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