I'm thinking about upgrading my PSU so that I can safely install a more power(hungry)ful graphics card, something like a Radeon HD 6870 or 6950 (the 375 watt Dell PSU has been surprisingly stable for the Q6600/5770 combination, but I'm not even going to try pushing it past that). The idea is that I would buy the graphics card and PSU now or in the near future, and transfer them over to a new PC build further down the road when I get enough money for a new processor, case, mobo, and RAM. So, the question is: what do I need to find out about my PC before choosing a new PSU for it? I went to Microcenter the other day and the employee I talked to said that Dell PCs are known for sometimes using proprietary PSU connections, and I'll need to check the PC mobo directly to figure it out. Informative, but not exactly helpful...he didn't really explain how to check. How can I check what PSU connection the mobo has? What PSU connection does it need in order to work with third-party power supplies? Also, if I can upgrade the PSU, would this be a good choice? http://www.newegg.com/Product/Produc...z%20modxstream Would this be sufficient and stable to power a 6870 or 6950 with my Q6600 (or a 2500k, the CPU upgrade I'm eyeing)? I have no intent on doing a Crossfire/SLI. Also, is the OCZ brand a trustworthy one? Edit: My google-fu has yielded this schematic of my PC. I'm a little lost with all the numbers; does this give the information I'm looking for?