Measuring CPU voltage on Intel 440BX board \ VOGONS

Measuring CPU voltage on Intel 440BX board

Topic actions

Post a reply

First post, by lost77

Posted on 2019-08-06, 16:46

lost77 Offline

Rank Member

Rank: Member
Posts: 213
Joined: 2018-09-24, 23:01

So, I have this simple BX board that doesn't have a monitoring chip or voltage control. If I put in a coppermine CPU it is detected as a Pentium III. The correct Mhz is also shown except for 1000Mhz which is shown as :00 (maybe it can't display 4 digits). The system works fine but i'm am wondering what kind of voltage it is getting. My coppermine CPUs work at 2.0v but I would rather not run them like that for long.

I don't have any experience measuring voltage from a VRM but maybe you guys can help me.

Here is a picture of the CPU area:

https://imgur.com/yd1yXMN

Reply 1 of 3, by andrea

Posted on 2019-08-07, 12:53

andrea Offline

Rank Member

Rank: Member
Posts: 139
Joined: 2018-06-08, 13:53

Check between the tab of the two mosfets and ground, one should be 5 Volt and the other should be Vcore.

Andrea

Reply 2 of 3, by lost77

Posted on 2019-08-07, 15:36

lost77 Offline

Rank Member

Rank: Member
Posts: 213
Joined: 2018-09-24, 23:01

Thank you very much. I used a molex for ground.

Deschutes 300Mhz: 1.94v
Coppermine 733Mhz: 1.61v
Coppermine 1000Mhz: 1.66v

It is under-volting some but so does the testing PSU. Main thing is they are stable and running cool 😀

Reply 3 of 3, by ph4nt0m

Posted on 2019-08-07, 18:59

ph4nt0m Offline

Rank Member

Rank: Member
Posts: 341
Joined: 2018-01-01, 19:03

If they work without any mod to the board, their voltage must have been sensed through the VID pins and set up accordingly. The Coppermines require 1.50V to 1.75V depending on a model.

My Active Sales on CPU-World

Go to top of page Go to top of page

Back to General Old Hardware

Main menu

Common searches