Minimum PSU Requirements?

Whats up guys,

So I'm buying a gtx 660 but I'm worried my 450 watt psu wont cut it. I've tried searching this question on google but get nothing but 660ti responses.

Any thoughts?

I'm going to be grabbing 2 680's really soon and I will be using a 750 watt PSU and that is already overkill. You can get away with about 550ish for a single 680, so to answer your question, yes you should be woried about your wattage.

Also, use this...

Here, you can calculate the exact PSU requirement, for the GPU it self is required 202W, but also you must care about how much is your PSU old, cause by age it loses power.

Thanks for the responses!

Turns out 450 will be fine....phew.

One thing you may want to keep in mind also, is from my experiences you want a PSU that has an output that's a little more than your computers requirements.  If you use a 450W PSU and your computer uses 400-450W it will be working its butt off and won't last long.  I usually try to go with a PSU that's at least 20% (if not 30%) above your computer's max requirements.  This serves two purposes, the overhead is good if you intend to SLI/Crossfire so that you'll be ready for it, and if you don't SLI/Crossfire your PSU won't be near 100% capacity most of the time. This is just my two cents on the subject, don't take this as set in stone thinking.