I bought a gtx 670 galaxy edition and its too big for my whole motherboard litreally. All I'm asking for is a little help from the gtx 670 users out there. Are there any custom desktops that would be able to attach the gtx 670. My games lag when I play .... huge let down for the holiday break.
I'd imagine your PSU is inadequate for that card as well, given that you are working with an HP Pavilion. The most I'd be comfortable with on an HP "off-the-shelf" desktop is a GTX 650 or HD7750 in terms of power consumption.
Remember, those computers are built to power nothing else other than the components it comes with from the factory. The TDP of your GPU probably more than doubles the power requirement for that computer.
There's your problem. Those things, along with most other made-for-retail desktops, don't have cases and component layouts designed with enthusiast graphics cards in mind. You would have to replace the entire case with a roomier one, but there's also no guarantee that the HP motherboard was designed with any other case in mind: if it has some sort of proprietary front USB/power button/LED connector on there (which some do) then you can't move the motherboard.
You may very well be screwed unless you contact HP and ask if it is possible to do what I am suggesting, if they say it is okay.