Yes 2048 =) Thanks for the filter tip, it made my test image a little sharper. And I reacted a little to much because I used the wrong angle of the light than I use to. ( some old "paintings" has rendered well at about 7000 pixels ).
Great to know the difference now with the Filter thing. There are thousands of things I have no idea about in Cheetah =)
It was mostly a misunderstanding from my part, putting together the wrong numbers ( 2048 ) with my wrong lighting.
When using camera or distant light for instance, to get straight lighting on a "painting", the bump map seemed to not be correctly rendered/fit, it got "blurry" ( top image, the others are Cheetah and Falcon rendering the same small part of a painting with a HDRI image as light at an angle that works great ).
So now I have a better understanding why I did my standard misunderstanding =) .