PCIE GPU - MB has 4 pin power also for stability. Confused

Hi.

Have a PCIE ATI X1950 XT GPU with it's own 6pin power connector.
MB also has a 4 pin power connector:

"This 12V power connector JPWR3 is
used to provide power to stable the
operation of graphics card."
Same type you would use to connect ide drives and such.

Now, do I use the PSU power to power the GPU, the MB, or both?

Really no detail other than what I pasted above and unsure if I am supposed to connect to both with use of a splitte. Otherwise, i don't why it is even there as who would want to power a GPU strictly off of the mainboard?

Currently have a 600W PSU which has seperate VGA power cord, but 12v 4 PIN, so I have the adapter in place until I pick up a new one this week with dedicated 6pin connector(s).

If anyone can clarify this for me, I would appreciate it.

Also, any advise on particular specs to look for in a PSU.
Right now one of the fans on it is auto and swicthes speed if need be and have the inputs on the PSU, so I can not use the ones I don't need and not clutter the case for more airflow, which I like.

Thanks.

my mobo has one of those. although the molex one is only there for crossfire mode. is you mobo designed for dual gpu's?

if so and you are only using one card you won't need to connect the mobo connector.

And to answer a few questions.

No, the MB is not designed for dual GPU.
Did not know which brand I will do that with, so went single right now.

Since that molex on the MB is for dual GPU would that mean, I again do not need if my PSU has twp seperate PCIE power connectors?

Thanks guys.

I had used a y cable last card (4pin molex to 6pin to 4 pin molex) and hooked then all up.

Thanks again for giving me some insight. The way the manual put it, was a tad odd.