It depends on the computer, but usually up to 4 GB of memory.
enough to remember your mom
There are many different models, go to www.compaq.com and consult the online documentation for your model.
If one is finding that it is necessary to upgrade the memory of one's PC one must first find out how much memory the computer has and how much is needed. One then can determine how much memory can be added and it would then be installed by putting into the slots that are available for RAM. For more detailed information for Windows based PC's one can view the Microsoft website.
It all depends on the amount of memory you have on your computer. For example, if you plan to install the program, and you barely have enough memory for it, chances are your PC will run very slowly, and may give you a ''memory low'' warning from time to time. You can buy memory for your computer at a local media / electronic store.
You need to download and install the unformat software on your PC. Then connect the memory card you just formatted by accident and start to recovery.Note: chances are not 100% if you continue using the memory card.
More often it is the motherboard which determines the Memory which can be in a PC.
ho much memory does a modern PC have
No. Installing new components in a PC rarely, if ever, requires a BIOS update. RAM or memory especially is very much a "plug and play" component. Just turn off your computer, install the new memory, turn it back on and it will be automatically recognised.
One GB is a start, but it'll use all the memory you have.
16 GB is recommed
It depends on the motherboard. If you can find out what type of motherboard you have, you can look up what type of memory and how much of it you can install into the memory banks. Keep in mind that the operating system that you have may limit how much of the installed memory you can actually use.
When your PC runs of of physical memory - it uses the hard drive as memory so it's much slower when it gets to that point.