20 pin powersupply for 24 pin boards

[RAGHU75]

Hi,
I have a RS480M2 motherboard with a 24 pin connector.
My Antec Chassiss/powersupply has a 20 pin connector. Since the motherboard manual says OK for this, I connected them both leaving the 4 pins on the motherboard unused.


1. Can someone point out the problems of using a 20 pin powersupply on a 24 pin connector ?

2. Is it recommended to use ATX 20-to-24 Pin Adapter in this situation ?


Regards

 

[blinky2004]

DFI state not to do it with their NForce4 boards.


http://www.dfi-street.com/forum/showpost.php?p=55275&postcount=13

 

[GadgetBuilder]

The Chaintech VNF4 can use a 20 pin or 24 pin supply. Chaintech says a 24 pin supply might be helpful with higher power video cards expected in the future:

http://forums.pcper.com/showthread.php?t=380534

See the answers from Chaintech highlighted in red.

 

[MatrixVPR]

I herd that the extra 4 pins is for the PCI-e so if your planning on running some serious graphics then you might want to consider changing out the PSU

 

[Bona Fide]

DFI is the only manufacturer that I've seen requiring 24-pin connectors, but it's always better to use 24-pins. If you can get a native 24-pin, that would be best, if not, at least get the adapter.

 

[raftman]

Originally posted by: MatrixVPR
I herd that the extra 4 pins is for the PCI-e so if your planning on running some serious graphics then you might want to consider changing out the PSU

I think that is right. The 4 extra pins go to powering the PCI-E slot. If you are using PCI-E and the video card has it's own connector you shouldn't need it. Most (high end) video cards have their own power connector since they use way more power than can be supplied off of the 12 V line on the PSU (which is what you would be connecting to both the CPU and PCI-E if you used an adapter).

Someone posted a good guide about 24 pin vs 20 pin connectors.

Here it is