My comp now is an EMachines T2460...I need to get a decent video card in here to replace the garbage onboard video. The computer has a 250Watt Power has a 16x DVD drive, a 48-16-40 CDRW, 60GB HD, and a PCI modem. With all this, will I be ok with the current power supply and a GeForce4, or should I upgrade the power supply first?