I would like to buy a Thinkpad T420 with 8GB RAM configuration and install specifically 32-bit Ubuntu Desktop with PAE as I heard that 64-bit version has some issues such as providing support for applications based on Flash. Theoretically more RAM gives better speed, but practically there could be some issues such as consuming more power etc. Therefore, I am not sure whether I can get improved speed if I use Ubuntu 32-bit PAE with 8GB RAM instead of 32-bit PAE with 4GB RAM or not, specifically for watching streamed movies, playing videos, video encoding etc. Therefore, I am in dilemma whether to buy T420 with upgarded 8GB RAM or not?