so, how does a titan compare to a quadro?
The original Titan sits between the Q5200 and the Q6000 with 2688 processing units. The former has 2304 stream processors (like the 780) and 3GB VRAM while the latter has 2880 stream processors and 12GB/6GB/3GB VRAM for Q6000/Titan Black/780Ti respectively.
Q6000(12GB)>Titan Black(6GB)>780Ti(3GB)>Titan(6GB)>Q5200(3GB)>780(3GB).
Keep in mind the 780-series, Titans, and Quadros differ in some compute performance, frequencies (including turbo) and most importantly, the professional drivers in the Quadro-series.
Edit: The Titan II/Titan 'X' is rumored to have 3072 (Maxwell) processing units vs. the 980's 2048. This is 50% more than the 980, which cannot be apples-to-apples compared to Kepler's processing units. Just pointing this out...