you got a bad proccess on your cpumy computer did that until I found a process called MyAgtSvc.exe which took up 120,890 KB of memory
Just get the 4GB now and then when you build your i7/9 rig you have that extra $100 that you would have spent on an extra 4GB to get new DDR3 RAM.tl'dr: I don't think it's necessary to have 8GB right now. Cut that in half and you get to start saving early for that new rig :D