Ooo...actual benchmarks. With professional drivers in use, the question of quality equivalence should be moot.
You should change the order of your list, Uttar...your numbers are in the order: Quadro FX, FireGL X1, Quadro 980.
Is this the benefit of the FX vertex processing arrangement? I.e., fixed function/"simple" T&L performance? Makes the decision look pretty smart if it saves real-estate, given the supposition of vertex shader performance being "easily" enhanced by the CPU and past indication (quite a while ago, forgive me for lack of a quote or perhaps being in error please) of a performance load balancing design goal of nVidia between CPU/GPU usage (and the demonstrated ability, if that is the case, of carrying it off well).
Then again, I wonder what exactly ATI has in mind to improve their FireGL driver performance as mentioned in the Tom's Hardware (
) article. I consider the fine tradition of shoddy and dubious video card benchmarking at Tom's Hardware in fine form, and I point out the screenshot showing "1021" for the drivers in that review, while 1024 was used for the numbers that Uttar is quoting, and also point out the similarity of the Tom's Hardware review numbers to the poorly performing mini-drivers mentioned at AmazonInternational.
On a positive note, the approach of that reviewer to the review struck me as well thought out and professional (in contrast to my opinion of every other videocard review I recall reading there), even though execution seems to leave some room for improvement. Hopefully that person will do future reviews and maybe some day (maybe as soon as the very next review or an update to that one), I won't be shaking my head over something after reading an article there.