Is printer dpi constant?

It seems like an obscure question but what I'm asking is if I buy say a have a 600 dpi printer, and buy a 4800 dpi, will it have a higher density and smoother curves, or just a larger print head and print faster at the same low resolution. Would this printer have high quality color prints http://www.overstock.com/Electronics/Canon-PIXMA-iP2702-Inkjet-Printer-Color-4800-x-1200-dpi-Print-P/4669993/product.html ?
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  1. im unshur but i read a bit on it:

    http://www.ephotozine.com/article/common-printer-myths-explained-16876

    should give u more information :)
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