Upgrade to Mountain Lion

rsamyasaw wrote:

Also will it effect Capture Nx2 software which I am using widely

Possibly.

Check here for compatibility of 3rd party Software you may be using...

http://roaringapps.com/apps:table

NOTE that Rosetta is no longer supported in Mavericks, Mountain Lion and Lion

rsamyasaw wrote:

My current os in 10.6.8 and please advice on how to upgrade to mountain lion.

First... Check here to see if your Mac is compatible...

http://www.apple.com/osx/how-to-upgrade/

If so... would recommend at least 4GB of RAM... if not 8 GB

It is important to get the Correct and Matching RAM

See Here > OWC RAM > http://www.macsales.com

The above site also has videos on how to Install RAM should you need it...

NOTE:

It is both Prudent and Recommended to Backup Before any Major Update or Upgrade