Quick note:  

"It combines the best of both worlds. NVIDIA also states that the Tesla GPUs go through a much more rigorous Q&amp;A process which guarantees lesser failures and also has additional features such as ECC memory. Hence the large price difference."

What you are basically saying here is that NVIDIA has a rigorous question and answer process with their video cards to guarantee quality.  I suppose if you wanted to REALLY personify video cards you could call running a video card a "Q&amp;A," but I'm almost 10000000% certain you meant to say QA, which means Quality Assurance, and is the most commonly used term to refer to... well... assuring quality in a product before shipping it :P