Rowcache and quorum reads cassandra

[Artur Kronenberg]

I was reading through configuration tips for cassandra and decided to 
use row-cache in order to optimize the read performance on my cluster.

I have a cluster of 10 nodes, each of them opeartion with 3 GB off-heap 
using cassandra 2.4.1. I am doing local quorum reads, which means that I 
will hit 3 nodes out of 5 because I split my 10 nodes into two data-centres.

I was under the impression that since each node gets a certain range of 
reads my total amount of off-heap would be 10 * 3 GB = 30 GB. However is 
this still correct with quorum reads? How does cassandra handle 
row-cache hits in combination with quorum reads?

Thanks!
-- artur