Need help on quality of resized image!!

I am required to resize images to max 1240pixel (longest dimension) as a submission of work, though when work is viewed it will be at 30"x40".  Can not figure out a way to do this where images don't become quite pixelated when viewed at larger size.   Appreciate any suggestions. 

Is there some software to verify if my graphics card is shotty?
Techtool Pro has some testing, the AHT tests VRAM, but game benchmarks and stressing will tell you the most.
Is re-seating the graphics card or memory worth trying?
Absolutely. Just don't reinstall the graphics card until you clean it thoroughly.
Cleaning the dust out of my machine?
YES. A dust filled graphics card heatsink will cause the GPU to cook, and cause problems thet you describe.
If I need a new graphics card, what are my options? Do I have to purchase it via Apple store? I would like to stick with an Nvidia card so am I stuck buying the same card I currently have or can I upgrade?
You don't have to buy from Apple, but using with OS X limits your choices to Mac compatible or flashable PC versions.
There is an awful lot of user input into this topic here:
http://blog.macsales.com/602-testing-those-new-graphics-cards
Card reviews can also help:
http://www.anandtech.com/video/showdoc.aspx?i=3140&p=9
http://www.tomshardware.com/reviews/radeon-hd-4870,1964.html

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