hybrid hard disk drive
What a person could do with a limited amount of Mother Board system ram is to buy a solid-state drive (SSD).
Windows uses the hard drive for virtual memory anyway, unless you have enough RAM to disable virtual memory.
You could just point the Windows Pagefile.sys Swap file to use the solid-state drive.
The solid-state drives are fast and just about any system can gain great speed over a mechanical HDD.
If you use a solid-state drive for the system disk, it will boot in seconds. Also great for Video Rendering.
The prices are coming down on the solid-state drives and they are kicking butt, If you want or need serious speed.
Many people buy Windows 64 machines when most software is running x86 and WOW64. The only gain in most cases is more system ram. You still have a pagefile in use unless you disable it, and have compatibility issues to deal with. (Drivers mostly)
Speaking of AST, I think AST was the first to use Swap/Page Files in the day using a software utility, worked good.
Double RAM was a software utility that appeared to double system ram but was very slow on a 286.
Double Disk was popular Windows Screw up in the age of 20 and 40 meg hard drives and was very slow also.
"Theory only works perfect in a vacuum." KA9JLM Don