Im gettin tired of my small 1GB ram.
Just to clarify, you only have 1GB stick of RAM or multiple 1GB sticks? Probably best to find out what is hogging all the CPU usage.
What type of RAM are you currently running?
Definitely would make a boost difference. Higher RAM GB allows more processing capacity for data and instructions to be read it from hard drive, allowing the CPU can read it faster, thus boost. CAS also plays a factor to performance.
Don't see why it wouldn't make a difference though unless you get a low grade 2GB stick with high CAS.
Now, since you said you were considering a new rig, I wouldn't spend too much money on quality RAM, but be sure its not so cheap where is would kill your rig