Ok I've got a silly/noob question or you guys. What would I notice more performance gains from:

1- Running tighter timings to my 4GB ram (Current 7-7-7-24-2N/2T)

2- Lowering the Dram Frequency from 1601Mhz to around 1200Mhz (as it stable at this frequency) and adding another 2GB stick (so 6GB total or even 8GB since I've got 2x2gb sticks lying around)