Added some new H/W to my (2 ½ year old} system and now my Ocz Falit1ty 550 Watt P/S shuts off almost instantly upon powering up. I can’t see any way there’s a short, and it still runs alright if I disconnect the new W/D red 2TG hard drives and remove the new AMD 7950 video card. I wouldn’t be surprised if it heated up under load – but it can’t even begin to boot. I do a lot of editing, rendering, and converting of lengthy video files so I need to be able to accommodate and sustain a heavy CPU / GPU load. I used to think that 550 W was big, but now I’m looking to buy a heavier P/S. I would appreciate experienced opinions on how big I actually need to go. My system when upgraded will be: Gigabyte M/B GA890GPA-UD3H AMD Black Edition four–core Phenom II @ 3.6GHz TBD P/S 32 GB PC1600 (4x8) LG CD/DVD R/W; Blu-ray Read only LG CD/DVD/ Blu-ray Read/Write Sapphire AMD HD 7950 (4) W/D red 2TG harddrives (1) 240 GB Consair SATA III SSD When Intel releases its next “Tick” I may upgrade to a new Intel CPU and an appropriate new M/B, but that’ll probably use less power than my present AMD CPU does now. I am looking at the SeaSonic X Series X-850 that Newegg has on sale through today for $129.99. It seems to have good reviews. Thoughts anyone?