Does my motherboard need -5 volts?

Msi motherboard / Ms-7015
January 16, 2009 at 15:54:05
Specs: Windows XP Home SP3, AMD Athlon XP-A 3200+ / 2GB

I want to buy a replacement PSU for my MSI MS-7015 motherboard (Chipset is VIA VT8377 Apollo KT600. BIOS is Phoenix AwardBIOS v6.00PG).

My existing PSU provides a -5V rail, carried on pin 18 of the 20-pin motherboard ATX power connector.

However, nearly all modern PSUs no longer provide a -5V rail. I believe it was written out of the ATX power supply spec some years ago.

Will my motherboard function properly with a modern PSU that doesn't provide a -5V rail?

Many thanks.

London, UK.

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January 16, 2009 at 16:30:53
If you motherboard uses DDR RAM which is almost certainly does then the -5v is redundant.

The -5v rail was needed for older types of memory.


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January 16, 2009 at 16:51:53
The owners manual for that board would most likely state voltages and current requirements.

Does it say that?

"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10

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January 16, 2009 at 16:58:41
The owner's manual just gives the pin-out of the 20-pin ATX power connector.

This pin-out does include the -5V pin, but I'm not sure that this means it needs it for the board to work.

Thanks for your replies so far.

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