yes for example 256 x 2 would give better performance then 512x 1 module but would also mean that when upgrading you would be wasting some money, unless giving it away, selling it or using in another system. In other words, if you plan to upgrade anytime soon, best wait and not waste the money.
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.