I recently built a SN27P to replace my SN256P to take advantage of the larger power supply and the AM2 slot. I currently have an AMD Athalon x2 4600 with 2gb of ram, dvd-rw and 250gb HDD. Windows XP home sp3. My GForce 7800 GTX works until I load the proper driver, then blank screen. I have 2 identical cards and they both work in my HP Pavilion. When it wouldn't work in a SN25P I figured it was the 350w power supply. The video card works in the SN27P running UBUNTU 8.10.