When I was first pointed in the direction of this article I wasn't hessitant to read or recommend it because I know that articles on pogonina.com are generally well thought out and informative. I don't know who was involved with making the
interview with GM Khalifman possible (i.e. if the interviewer was Natalia or Peter) but I thank them for publishing it!
I want you to click the link above and go there and read the full article for yourself but I did wanna share this insightful response that Khalifman gave:
Q: Unless it is is a secret, what computers do you use when analyzing (e.g. writing books)? Supercomputers or regular PCs + super GM skills?
Of course, it would have been nice to check some variations on a supercomputer. Alas, I don't quite understand where and how to arrange that. So, purchasing every year a brand new model that will soon become one of many seems irrational to me. Therefore, I am working on a rather ordinary computer, trying to substitute the shortcomings of computer "brains" with my own.
Think for yourself and you'll improve tremendously.