Maya supports UDIM files preview in the viewport 2 on standard nodes like lambert, blinn etc.
Unfortuntatelly vray mtl nodes only display UDIM 1001 across all UV space (even if you have e.g 1001-1005).
thank you
Peter
In 2016 and later we support the native UVTILE/UDIM tiling, which has its own viewport preview. Have your tried it, it’s built-in to the file node.