Mobile Workstations are by no means "puny". They pack some serious power. It's high time people realize that the GeForce series is not for rendering purposes, it's for gaming so game with it. A mobile workstation with Quadro(for eg. Quadro k5100m in HP Zbook 17) would prolly beat any desktop with GT7xx(not sure about TITAN & GTX 780Ti) series card in RENDERING ONLY. If you want to buy a desktop for RENDERING then get a Quadro card ffs.(eg. K5100) Since the OP wanted a lappy, I recommended the HP ZBOOK 15(sorry for missing link, still not used to forums).
Yep, Didn't know that. Regardless, I still think that a desktop is a better option because mobile CPU/GPU's(no matter how powerful) pale in comparison to their desktop counterparts.
Besides acc to this link
HP Mobile Workstation- ZBook 15 | HP® Official Site
The best card this lappy uses is a NVIDIA Quadro K2100M (2 GB dedicated GDDR5), and according to notebookcheck
NVIDIA Quadro K2100M - NotebookCheck.net Tech
This card cannot even beat a GTX760M or an AMD Radeon 8870M, how do you expect it to beat a GTX 7XX desktop card. ????
AFAIK this rendering stuff requires some really serious firepower ! therefore OP is better of investing that much money in a Desktop.
Cheers!
Abhijit