Q: Is there any problems or drawbacks to adding RAM of different speeds to my computer? The RAM would be from the same company... but the RAM currently is 1GB (two 512MB 184 Pin) and I am thinking about adding 4GB(two 2GB 240 Pin) but both are the SAME brand.
A: You cannot upgrade your RAM as you have described. You have 184 pin sockets so you cannot install memory modules with 240 pins - they are incompatible. You have to stay with 184 pin memory modules and it is always a good idea to install idenical modules - don't mix different speed modules. Also, if you are running 32-bit Windows operating system, your system cannot use more than 3 GB of memory even though you can physically install more than that. The upper memory addresses are used for mapping I/O which effectively makes most memory above 3GB unaccessible.