Rationalising the utility of swap in Samsung Galaxy Ace S5830 I am trying to get my hands on the average read/write speed(s) of the RAM bundled on the said phone. Just wondering how this faces off with a Class 10 micro SD. I was thinking if the Class rating was high enough, maybe using swap might be a good idea.

Q1.) Is there a Class rating that is performing almost onpar with the RAM random access timing?
Q2.) Is my theoretical basis invalid?

Thank you!
According to this discussion on MoDaCo, the RAM throughput of an Acer Liquid is 1.3 GB/s.  Even if the Ace's RAM is slower (unlikely) it's got to be way faster than the Class 10 SD card speed (10 MB/s write).

So yes, your theoretical basis is invalid given that Class 10 is the highest rating.  Even UHS-II cards with a "theoretical" max speed of over 300 MB/s are slow compared to RAM, and few phones support SDXC cards anyways.