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Problem with using molex to PCI-E 6pin adapter is that for cards that consume even only around 100W-150W, it can be too much for the cheap/generic PSU and might make it go out with a bang (and might take other hardware along with it).6'666 posts... :| lol
Not sure about the fastest, most low end cards come with a molex to pci-e power adapter, is that not an option? They don't draw much power.
7750 I believe....