Socket 462/A and 12v rail \ VOGONS

Socket 462/A and 12v rail

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First post, by Almoststew1990

Posted on 2021-03-11, 16:04

Almoststew1990 Offline

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I am thinking of building a Socket A PC. If a Socket A board has a 4-pin 12v "CPU power connector" in addition to the 20-pin ATX power connector, will the CPU (say a ~50watt Athlon 1GHz) use the 12v rail, or is there some other reason why these boards have the separate 4-pin power connector?

Reply 1 of 3, by TheMobRules

Posted on 2021-03-11, 18:40

TheMobRules Offline

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In general nForce2 motherboards with the 4-pin connector will draw all the power for the CPU from the +12V line, but I've heard that on some other Socket A boards this is not the case and the CPU still mostly pulls from +5V despite the connector being there.

Are you talking about any motherboard in particular?

Reply 2 of 3, by kolderman

Posted on 2021-03-11, 18:49

kolderman Offline

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> or is there some other reason why these boards have the separate 4-pin power connector?

It was *only* to feed the CPU vrms AKAIK.

Reply 3 of 3, by Almoststew1990

Posted on 2021-03-12, 10:03

Almoststew1990 Offline

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Posts: 876
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Location: Southampton, UK

I'm looking at cheapo boards

MSI MS-6786 (OEM) with a KM400A Chipset
PC CHIPS M825 with KM266/8235 Chipset

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