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How to change vcore on Athlon XP T-bred

post #1 of 7
Thread Starter 
I'm new to Overclock.net so please bear with me. I just received a new motherboard and CPU that I'm overclocking. I have a Biostar M7VIT 800 board and an Athlon XP Thoroughbred "B" processor, AXDA1800DLT3C. The board only allows me to adjust the FSB. I'm able to get the CPU upto 1955 MHZ with the FSB at 170 MHZ. This with the stock voltage of 1.44 v, which seems a little low as the voltage should be 1.50 v. The idle CPU temp is only 38 C and underload it reaches 42 C. If I can increase the voltage I'm sure I can push this CPU higher. But my motherboard and bios does not allow voltage adjustments. So I need to know how to change the voltage setting on the CPU itself. What "L" bridge controls the voltage? I also need a table that shows me which of those gold dots on the "L" bridge I need to open and close for a given desired voltage? I won't be opening any of those dots but I'm hoping I can use conductive paint to close the dots to achieve a higher voltage.

Thanks for any help,
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(13 items)
 
  
CPUMotherboardOS
Athlon XP Throughbred B Biostar M7VIT 800 Win 2K 
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My System
(13 items)
 
  
CPUMotherboardOS
Athlon XP Throughbred B Biostar M7VIT 800 Win 2K 
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post #2 of 7
Take a peek here!
http://fab51.com/cpu/guide/cpu_guide1-e.html

BTW, HI and WELCOME to the forum.
Sorry it took so long to reply

Darn it... I know the coresponding bridges are in there some where... still looking

Here we go...
Check and compare your default to the Athlon Vid codes 1 and 2 very carefully so you are sure you have the correct chart!!!
It's near the bottom of the page.
http://fab51.com/cpu/barton/athlon-e23.html

NOTE... do compare carefully, you do this at your own risk!!!
    
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post #3 of 7
Thread Starter 
Thanks Duke. Just what I was looking for. To increase the core voltage from 1.5 to 1.7 it looks like all I have to do is close the VID 3 dots on bridge L11.

From what I have read on closing these dots. I mask the laser cut pit with tape. Use a tiny drop of super glue to fill the pit. Scrape off any excess glue. After the glue drys, remask the gold dots so they are now exposed. Then use conductive paint to connect the dots. I guess all it takes is a steady hand. Is that the procedure most of you professional overclockers use?
My System
(13 items)
 
  
CPUMotherboardOS
Athlon XP Throughbred B Biostar M7VIT 800 Win 2K 
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My System
(13 items)
 
  
CPUMotherboardOS
Athlon XP Throughbred B Biostar M7VIT 800 Win 2K 
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post #4 of 7
sounds like a plan to me.
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
X2 3800 ALBATRON KM51PV M-ATX Gainward 7900GT 512MB Team Group PC4K 2GB 
Hard DriveOSMonitorKeyboard
4 x 250GB That is me. 19" LCD WOLF CLAW V2 
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post #5 of 7
Thread Starter 
You do know General George A. Custer also had a plan, which didn't work out so well.
My System
(13 items)
 
  
CPUMotherboardOS
Athlon XP Throughbred B Biostar M7VIT 800 Win 2K 
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My System
(13 items)
 
  
CPUMotherboardOS
Athlon XP Throughbred B Biostar M7VIT 800 Win 2K 
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post #6 of 7
Thread Starter 
OK, got my vcore voltage set to 1.7 v, although my hardware monitoring software says I'm running at 1.64 v. On this motherboard all my voltages are running low. The CPU seems to be stable at 2127 MHz with an FSB of 185 Mhz. Under stock voltage of 1.5 v it was running at 1955 MHz. So a 0.2 volt increase gained me an additional 172 MHz. And the idle CPU temp is 44 C.

My old system was an Athlon Thunderbird running at 1625 MHz. My new motherboard, CPU, and RAM cost me $125. So I think the increase in speed was well worth the bucks. I'm one happy overclocker.
My System
(13 items)
 
  
CPUMotherboardOS
Athlon XP Throughbred B Biostar M7VIT 800 Win 2K 
  hide details  
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My System
(13 items)
 
  
CPUMotherboardOS
Athlon XP Throughbred B Biostar M7VIT 800 Win 2K 
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Reply
post #7 of 7
Yes... you hit the nail on the head on the bridge jump
On the voltage... the software reports aren't to accurate. The only way to know for sure is to put a meter on it and compare the softs voltage. Then allow for the variation.
GREAT WORK BTW
    
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500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
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MS KU462 Natural SS DA750 MS 5 button 
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CPUMotherboardGraphicsRAM
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500G WD Black LiteOn CD/DVD R/W Win7 64 22'' ws Acer AL2223W 
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