Tweaked RAM timings for better throughtput. 

Based on researches by @Pattyboi, @Ziyann and @freshgiammi. 
Thanks to @Boype for the first ram timing tweaks.
(RGBandwidth, misc, 1 thread, 20 benchmarks best result wins)

       Stock                     Tweaked 

Copy   1249.9 MB/s  -> 1428.7 MB/s -->   14.5 % improvement 
Scale  1084.8 MB/s  -> 1304.5 MB/s -->   20.3 % improvement 
Add     938.4 MB/s   -> 1223.8 MB/s -->    30.4 % improvement
Triad   923.0 MB/s   ->  1191,7 MB/s -->   29.1 % improvement 

Signed-off-by: Gianmarco Rengucci <rengucci.gianmarco@gmail.com>