Quadro DOESN'T HELP in RENDERING(assume the RENDERER doesn't support GPU).

Processor aka the CPU(Central Processing Unit) is the KEY for RENDERING SPEED.

Quadro GPU is for SIMULATION and SMOOTHER VIEWPORT only.

Even if the RENDERER supports GPU to render the stuffs, Quadro GPU is still a slowpoke for that. Cheaper GeForce GPU can outperform it easily.
Example:
2x Quadro FX 3800(So expensive) still loses to 1x GeForce GTX 460(Cheap) in RENDERING SPEED(GPU supported RENDERER).
But, when come to SIMULATION and VIEWPORT SMOOTHNESS, Quadro WINS! smile.gif

Keywords:
Viewport = The 3D Space which you model your stuffs, character, buildings, etc.
Simulation = Water, Fire, Smoke, Particles stuffs.
Renderer = The SOFTWARE you use to perform the RENDER aka Mental Ray, Vray, iRay, Maxwell, Rhino, RatGPU, etc.