I've always been an advocate of getting what you need. In this case you need a PSU with a PCI-E power connector. Back when PCI-E power was new, it was OK to use a molex to PCI-E power adapter. PSUs with PCI-E adapter have been around forever now. I look at any PSU without one as not having the current (amperage) capacity on the 12V rail to properly supply a graphics card. Unless your power supply is very old, in which case do you really want to jeopardize you new graphics card. There is a chance that if you "workaround" the need for a PCI-E power adapter, not only could you damage your PSU, but your new graphics card as well.