It looks you already gave me the answer...
Except I still can`t decide. Not before understanding a few things. And as you seem to know what you`re saying , I`m asking:
I read in a silentpcreview site a guide for a silent game rig using r5 and r4. The results were 16.5 dbA for r5. Now as I understand dbA is noise over ambient, meaning how much noise it ADS to the already noisy ambient. Now, I read on my purchasing site forum a user review stating his rig (with r5 case) made 30 db. Can you enlight me, are those 2 results ok?
(Also i was recommended Zalman z3 by quite many users in above mentioned forum, stating it will actually be fairly silent due to very good airflow. at roughly 40$, it a wow, but I still has to check it more.)
I like r5 better for its looks (top panel). I like r4 for its apparent value for money. I don`t really like nanoxia. I can`t find any deep reviews on Aerocool and color is not my side.
It looks I`m left with r4 and r5. In silentpcreview, the difference was 2 dbA in r5 favour. 2dbA looks little but they stated it is audible diference. quite similar configuration with mine and I should also say my desk is really close to my bed.