So it doesn't metter that i have 8gb of ram? So a game that comes out in 2012 and it is still single-threaded cpu based, just wow....
RAM most directly influences how much different stuff the game can load, I.e. ship textures, models, icons etc. Having more RAM means you can have more of this stuff, though Sins won't ever use that much RAM. The CPU is the one that has to do all the calculation for movement, damage, abilities etc.
Now days CPU is the main lag causer with Sins. You aren't going to get a whole lot of befit from additional cores beyond two. Two pretty good cores is a heck of a lot better for this game than 4 mediocre ones, even if the four have more power combined. This is because the Engine its using was first made in 2007 where quad cores were not very common.
Basically all you can do is try to decrease the number of things displayed. Turn off all the auto pinnings on your Empire tree and please make sure its stacked. Turn of trade ship icons and if you can try to avoid building strikecraft and mines. There is also plans for an optimization mod that could help.
