I have an enermax liberty 400w psu and I am planning on getting a 7800gt with my computer. My current setup is: amd 3200+, a8n - vm csm, cd - rw, dvd + cdrw combo, audigy 1, 80 gb segate 7200rpm harddrive sata, 2 x 120mm fans. The 400w psu has a rating of 30a on the two +12v rails when both are...