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[Exlo]

So, I'm pretty new to "building" a computer. I can't truly say I'm building one, as I got my computer fully assembled. However, from the moment I saw this thing's specs, I knew what my weakest link would be. The graphics card. A crappy 5450 HD, and with a flimsy 300W psu to boot. Now I want to upgrade my GPU, and I have a nice Radeon 6850 in mind... But I have no idea what to do about my power supply. I've read up on how to install GPUs and all that, and I know what I'd need and why I need to upgrade my power supply, but I just have no idea what power supplies will work with my system... So I'm asking for help.

My current specs are:
Athlon II x4 620 Processor (2.6Ghz per core)
4GB of DDR3 RAM
Radeon 5450 Graphics Card
GF615M-P33 Mainboard
and Windows 7 Ultimate 64bit

Any recommendations or advice? I'll be honest, this is my first time replacing a component in my computer, so really, any advice is welcome. (Also keep in mind the 6850 requires at least 500W.) Thanks.

[Simmura McCrea]

I recommend a PSU by Corsair. Slightly more expensive, but I haven't had any trouble with this one.

[Exlo]

Yeah, I've heard Corsairs are pretty well built, but I'm more interested in understanding whether or not the PSU will be compatible. I mean, are they all the same? As in, do they all have the same amount/type of power connectors? I'd hate to get this and then find it to be incompatible...