VL/I-486SV2GX4 Motherboard CPU voltage. \ VOGONS

VL/I-486SV2GX4 Motherboard CPU voltage.

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First post, by badmojo

Posted on 2013-06-08, 22:52

badmojo Offline

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I have a revision 2.1 version of a VL/I-486SV2GX4 Motherboard, which includes multiple options for CPU voltage - see the spec below for details. The board came with a DX266 Overdrive chip on it and it all works fine, but the relevant jumpers (32 and 33) are set to the 3.45 volt setting. How can that be? Is the spec wrong, or will a 5 volt chip just draw as much as it needs regardless?

Also, the spec doesn't include a 5 volt option - it only goes up to 4 volt. Does that also indicate that the spec is wrong?

http://www.motherboards.org/files/manuals/1/C … I-486SV2GX4.htm

Reply 1 of 5, by Mau1wurf1977

Posted on 2013-06-09, 03:10

Mau1wurf1977 Offline

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Yea that's a bit weird...

I wouldn't worry about it and just get a 486DX4-133 and jumper the board to 3.3V 😀

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Reply 2 of 5, by vetz

Posted on 2013-06-09, 14:16

vetz Offline

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As far as I know the DX Overdrive CPU's run at 3 or 4 volt. I own this motherboard myself (it is the best 486 board I own) and I don't believe there are any 5V option. I know the Overdrive CPU's are made for running in 5V boards, but I believe when used in a 3v board it bypasses the voltage regulator. Same happens with the POD5V83 (which I use in this mobo)

See picture of the chips here:
http://www.chipdb.org/cat-dx2-66-331.htm

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Reply 3 of 5, by 5u3

Posted on 2013-06-09, 16:58

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Many socket 3 boards autodetect the required voltage through the VOLTDET pin.

Reply 4 of 5, by badmojo

Posted on 2013-06-10, 10:01

badmojo Offline

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OK thanks for the replies. Mine's the SZ935, dunno where I got the idea it was 5 volt from, but I wouldn't be surprised if I was wrong. Seems like these things are truly "plug and play" though - that was the idea I suppose. Intel had a winner on their hands with the Overdrives, they must have sold truck loads of them.

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Reply 5 of 5, by viktorcech

Posted on 2014-06-02, 16:36

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this is best MB for 486? i looking for something best

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