I have star sonic 500watt psu which doesn't have pci connector.
Actually, this card doesn't need a PCI-E Connector! The card draws in 75 watts so the power will come from the PCI Express Bus (where you put the card in).
you need to change your powersupply even thought the 7750 doesn't need a pcie 6pin connector get atleast a 350w psu form seasonic or 450w from corsair
Only the xfx dd version requires pcie connector.
HD 7750 does not need a PCI connector from the power supply. The standard versions are 55 watts and do draw the power through the motherboard connector. However, it really does require a good 400 watt power supply, and my guess of your no-name imitation copy name Seasonic is that it is a piece of junk, and should be examined for its ability not to cause issues. It is not sold in the USA. It should have a power label designating the amperage on 12V. What is your CPU? It also draws 12V power along with the graphics card, system fan(s), disk drives. Check or report power supply info for help. The card can be plugged in, but there is a chance of power issues in the 12V line.
