Looking for improvement without purchasing a new system - Ram??

I am looking for an improvedment (in a feable attempt to run FSX and improve my FS9 experience.. too many cool addons I use like the PSS/PMDG/ and Level D planes to dump FS9)Anyways, currently I am running the following:P4 2.8 OC to 3.1ASUS P4P 800 MoboATI Radeon 9800 Pro card512MB PC2700 Ram <--- probably the biggest bottleneck??Sooo is adding another 512MB of Ram going to help my situation at all until I get a whole new system in 3 months or so?? Thanks