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Do I need the 4pin power plug on motherboard - URGENT

Posted on 2006-07-05
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Last Modified: 2010-04-26
Hi Guys

I'm on a client site and replacing a power supply unit on a small (P4) server.  The server is fairly old and has a square 4 pin power connector on the motherboard.  The spare power supply unit I'm fitting in an emergency didn't have this connector but booted up no problems.  Do I need this connector plugged in to avoid long term damage to the server.

Urgent help needed
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Question by:kwalker25
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Callandor earned 500 total points
ID: 17042448
You should get a power supply with the connector.  The extra wire supplies additional current for P4 cpus that is necessary for stability, and if this is a server, you should do it right, or you may suffer outages.
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Expert Comment

by:PrinceAli0
ID: 17042862
The Pentium 4 motherboard requires this additional 2x2 4-pin 12V cable in order to provide the additional current needed for the Pentium 4 CPU.  This connector is the 4-pin 12V connector an dis on most new motherboards.  This additional power needs are required to feed the CPU as it is more power hungry vs. the older P3s.  I would get the correct PSU for that unit quickly, right now you only have 1 12V feed into the motherboard that is feeding the CPU and everything else, which is very  bad.

-Roger
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Author Comment

by:kwalker25
ID: 17042891
I agree with both comments.  The PSU I installed was the only one to hand in order to get the client up and running again quickly.

I will change the unit tomorrow morning but need to know if it will be safe in the short term.

Kenny
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LVL 69

Expert Comment

by:Callandor
ID: 17042939
Whether it will be safe for a day depends on the total power draw.  If it is operating ok right now at 100% cpu usage, you are probably safe for a day.  You can force it to run at 100% by running Prime95 http://www.mersenne.org/freesoft.htm
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