Having just recently purchased and installed a XFX 6600GT i found that i needed a minimum of 300 to 450 watts of system power. My 250 watt PSU was useless so today i purchased a JEANTECH JNP-500AP 500w power supply. I fitted it, yet everytime i start the PC I get a warning telling me that the 6600GT isnt getting enough power and as limited its performance as a result. When i troubleshoot this i get a window telling me that i must connect the supplemental power supply cables to the card, even though the 6600GT does not any ports for supplemental connections, nor did any cables come with it. Do i have to reset anything? what am i doing wrong? i am tearing my hair out with it.