Hi I am going to buy a new PC which has the following specs: # Processor: AMD Athlon II X4 620 2.6ghz 4000MT/S 2mb Cache SKT AM3 # Processor Interface : Socket AM3 # CPU Cooler : AMD Retail Boxed # Memory: Major Brand 4gb DDR2 800 PC6400 CL6.0 Memory Module # Hard Drive: Branded 500gb Sata 7200rpm 16mb Cache HDD # Graphics Card: Nvidia 9500GT 1024mb DDR2 Graphics Card VGA DVI HDMI # Motherboard: Asrock K10N78 Full HD-HSLI AM2 5200MT/S Nvidia 8200 Chipset SKT AM2 # Max Memory Support: 16gb DDR2 1066 # Motherboard Expansion Slots: 1x PCI-E 16x, 1x PCI-E 1x, 2x 32-bit PCI # Network Card: 10/100/1000 Giga PHY RTL8211B # Audio: 5.1 CH Windows Vista Premium Level HD Audio (Realtek ALC662 Audio Codec) # Optical Drive: 20x Lightscribe DVD Writer with Buffer Underrun Protection # Power Supply: Branded 450w 24Pin Power Supply Unit Now I don't know anything about PSUs so all I wanted to know is if I could safely add an old IDE Hard Drive and TV Tuner PCI card to this computer without any power problems? Thank You