I like Alian's point of view and always read something like that here and there.

I have not tried it but now I can test it myself.

I always wondered why did Microchip make two versions of the same chip , they could just do away with one version, unless they wanted to make some fast bucks by selling faster chips.

Earlier we used to get 16F877 - 20 but now somehow we do not find that any more in the market.

Thank you folks for inputing your ideas and research on the topic.

regards
Charudatt