I am currently an international Masters student studying at a US university and I'm in the process of applying to several computer science PhD programs in North America. I didn't have the chance to retake the GRE exam to increase my score. I'm wondering how the PhD admissions committee takes into consideration my 3-year-old GRE score... will they give it less weight given that I've already started my Masters, or will they treat it exactly as if I have just took the GRE exam?
I do not have experience from the perspective of a committee, but I believe that the general way to look at it is that the GRE scores, no matter how old they are, are simply another part of your application package, regardless of timing.
There is no difference in consideration for undergraduates if their GRE is new or from their freshman year; I would imagine that there is no difference that you took your test before your Master's.