Actually, all who replied had the entire thing all wrong.  Sorry - but true!
I say this from more than 10 years of experience with computer programs & 16
years as a professional artist.

You don't need any more than half (at the max) of your printer resolution to
obtain a quality print.  This is more than adequate to meet ANY printing
needs.  Any more than that is overkill & only creates a file that uses up
uncessary file storage space.

Fore example - if you are printing to an inkjet printer with 720 dpi, you need
not go more than 360dpi output to obtain the best quality print that your
printer can produce.  Even this is more than enough.  You can even go as low
as 1/3 of your printer's output dpi and be safe that you are getting the best
possible output.

If you plan ahead & know your final printed image size - you can
mathematically figure out what your final image size should be.  For example -
if your image needs to be 4" wide by 3" tall, you can set your render settings
to no more than 800x600.  If your image needs to be printed at 8" wide by 10"
tall - you would set your render settings to 1600x2000.

You can verify this in any "Photoshop" How-To book at your local book store.

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