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Is it okay to not have at least 1GB of RAM per CPU core?

I have a 1055T with some G.Skill 2000Mhz RAM (4GB of it). Does this create a performance issue?
 
No. 4 gigs of ram is plenty for most folks. And the ram doesn't have to run at the same speed as the cpu. The board will determine the correct speed on the auto setting. You can set the speed manually if you aren't satisfied with the performance.
 

It's not "per core". All 6 cores will access the same memory. Having more CPU cores does not at all relate to how much memory your computer will use.

memory does not become dedicated to a single CPU core until you get down to the L2 cache, which is on the CPU die itself and usually around 0.5MB. Even the L3 cache is shared between cores.