First things first, I know people will want to give me a whole host of reasons why I shouldn't want to do this but I'm really curious to see whether it can be done. So here goes...
I'm building a custom case SSF computer over the next month and I have a 100W limit for the graphics card. Unfortunately I'm also restricted to an nVIDIA card since I'm dual booting OSX and have already purchased an i5 3450 with an HD 2500 GPU (Not ideal I know). I was initially planning to use a GTX 650 in the build since the power draw is perfect but as we've all seen its hardly a powerful card and I'm used to the high end (times are hard).
So I have two options; wait and hope that the Ti comes out next month and is a worthwhile card, or, get a 660 and undervolt/clock it down to 100W draw. Now I'm impatient and also prefer to make the things I want work for me instead of wanting the things that already work. Plus the idea that I'll be able to overclock it back into a powerful card once I'm over this SFF obsession I have at the moment is also nice.
What kind of reduction in clocks/voltage am I looking at to knock 30W or more off the 660 and can this be done through software? Whether this would present issues in OSX is also a concern but I can't imagine why it would (I'm yet to explore whether the 660 is compatible at all but Kepler is doing pretty well so far).
I suppose a massive GTX 650 overclock is also an option but I assume there are less hurdles with an underclock. I guess nobody quite has these cards yet but I'd appreciate the experiment if anyone shares my curiosity.


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