Hi , I recently upgraded my 8600gt to a 9600gt. Installed it ect but now when i play games i get horizontal flickering lines on dark textures. I know it isn't gpu drivers because i updated them. Im not sure if its a power issue but it shouldn't be because its a 550w which should be plenty. The additional power is plugged in correctly (2x 4pin molex to 6pin pcie).
I'd imagine your power supply isn't helping. Not familiar with that brand, but look at its specs, they don't actually give the 12V amperage. It only says, "10A res max. for 115VAC". If it only had 10amps on the 12V rail potentially, that's not going to work for you.