VRAY RT & ACTIVE SHADE VIEWPORT

what is the difference between Vray RT & Active Shade Viewport?

sa active shade viewport yata nakuha ang idea ng vray RT bro.

I think better ang vray RT kasi sya yung tiping active shade na parang render output na talaga. That's the only difference I see.

i see... thanks for clarification.
anyway may i know what is the compatible Vray RT for max design 2011?

Well, with RT you can watch the near realtime preview your GI or anything vray specific settings....

Can't do that with the default activeshade.