power supply question

[semajjames]

Hello

I am trying to make a psu with a 20 pin connection run a board with 24 pin socket

I have looked at the pin voltages that are needed and all are available from the 20 pins

so if I get the little 4 pin socket that is missing and connect up to the correct available voltages on the 20 pin connector would this be safe ??

cheers

 

[Doomedspeed]

I wouldn't i found this, a nice summary of why the evolution happened:

For basic computer systems, yes. The evolution from 20 pin connectors to 24 pin connectors occurred when systems became more powerful. The extra 4 pins contain one extra wire for the three main power outputs - 12 volts, 5 volts, 3.3 volts, and a ground wire. Then they decided to power the CPU from its own 12 volt cable reducing the demand of both 5 volts and 12 volts from the motherboard. Memory changed from DDR (3.3 volts) to DDR2 (2.2 volts) reducing the need for 3.3 volt power. Then video cards started using PCIe power, further reducing the need for 5 volt power.

Unless you are powering something with integrated video or a very low spec video card, the 12 volt rail will not be heavy enough.

 

[pastymuncher]

If you have a psu with only a 20 pin plug then it's either:-

A. Old
B. Cheap and nasty.

Buy a new one, just make sure it's a decent brand.

 

[semajjames]

thanks guys

I was really trying to avoid getting a new psu at this time because when I did it would be a good one costing more than I want to spend right now

the psu (400w) it is both old, cheap and also nasty however the board I want to run is not going to be used for much more than facebook ,,lol there is a 2.4 cpu a nvida 7600 gpu, one hdd and 4 x 1 gb sticks of ram and 3 fans