Well it is what it should be, maybe I should explain a bit more if people don't understand the change:

N9 has 1024MB RAM in the device which is valid in both cases.

By default if you don't edit the script, when device boots up, it reserves 256MB of it as ramzswap0, so effectively your device has 768MB of RAM for your application pages and 256MB of swap for compressed pages.

With the edited script you have 1024MB of RAM for your application pages and 422MB of swap for encrypted compressed pages.

You do the math.

PS. running dropcache makes your fileaccess operations slower, so you shouldn't really use that one unless you want to slow your device down.