To convert the four 6-pin PCIe connectors, I highly recommend you to use a cable like this:http://us.estore.asus.com/index.php?l=product_detail&p=3427
It converts two
6-pin PCIe power connectors to one
8-pin PCIe power connector.
So, you will need two
such cables to get a total of two 8-pin PCIe connectors because a GTX590 needs that.
Try to avoid using ''(2) 4-pin Molex to (1) 8-pin PCIe adapter''. First, it is harder to find. Find one for a 6-pin is easier. However even so, this is a last resort. Use them only when the PSU does not have native
PCIe connectors available. And when using such a conversion, exercise extreme caution regarding the rail distribution of the PSU.
And, remember that one 6-pin PCIe connector supplies 75W while an 8-pin connector is rated for 150W. So, converting (2) 6-pin PCIe connectors to (1) 8-pin PCIe connector is very reasonable.Now, a head ups for the thermal management of your GTX590 inside your XPS730 case:
Your current BFG GTX260 Core 216 OC has the reference cooling design, ie with air intake by the card's fan and hot air is exhausted to the rear. This uni-directional air flow is no problem at all.
However, the GTX590's reference cooling design is bi-directional. The card expels hot air to both the front and the rear of the card (see pic 1 below).
The front exhausted hot air will run against the airflow intaken by the case's front intake fan (green arrows as in pic 2). This front intake fan of the case is responsible to supply fresh ambient air to the card. Its airflow might push the hot exhausted air back into the card. This is disastrous. I suggest you to DIY something there to prevent the 'collision'. (I imagine you can confirm the need for this measure by noting whether the temp is higher for that core).Edited by windfire - 3/24/11 at 8:10pm