But upgrading RAM has its limitations. 32-bit systems have a 4GiB ceiling on the amount of memory they can address, and above 3GiB there are some PCI address space issues that can result in you not making good use of all the memory. Even a 64-bit system is limited by the modules it supports and the number of DIMM slots. Beyond those limitations, there's the problem of software. Windows still likes a page file and files still get stored on those woefully slow hard drives we all still use.



Link: Hexus