what does the power cable that comes with video cards do? is it for when u dont have a 6-pin power connector or something? j/w cuz im thinkin bout gettin a ati 3850 and it requires a 6-pin connector, but yet i know 2 dudes with the same psu as me, runnin a ati 3850 perfectly.HP Hipro 300W 12V 19amps but yet it doesnt have a 6-pin connector
That's right, the power cable is in case your power supply doesn't have a 6-pin power connector. A 300W power supply for a 3850 is cutting it a bit close, but you'll probably get away with it if the rest of your machine is typical. (Typical machines with a 3850 are just under 200W peak. See link.)