Quote -

The Render artifacts / Progress Statistics Tab:
Notice the 2 render tiles (@ 128) where i'm getting some digital  garbage in those  tiles. Total surface area size 1.71gb i440.photobucket.com/albums/qq129/TerrasJadeonar/Glitches%20and%20Issues/Glitchtab3.jpg

When saving the render into a jpg file, do you still get the artifacts?
That may help to identify either a problem within your video card or a Carrara's rendering issue...

 
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Holyforest,
Hundreds of shaders for Carrara