My frend is building 1200 € build.


Please tell me the difference, if they have the same frequency and timings.


I would recommend 840 evo instead. Cheaper with similar performance.

 


I was just talking in generally, as RAM have such a low failure-rate, that there aren't any "reliable brands".
First you would look for which frequency and latency you will aim for, when you found out, get the cheapest pair of ram fitting those criteria.