It's not really a good comp, PERC card does not reveal at all, it is difficult for them to work together, was at the very ligament, has not yet been updated) to update the percent and problems in games will not be You have the RAM overclocked? because 4 police my DDR 3 at a frequency of 1800 in cities is not enough.
Myself a half year ago sat on DDR 3 and fallout 4 in some places in the city were additive fps, with the new memory, everything was fine.
It's all about the RAM, the fallout one of the few games which is very sensitive to the speed of RAM.