How do I expand my memory and how do I use it?

First of all, you can use DDR400 memory. If yours can't reach 400, it will be automatically downclocked.

Second, if you want to go up, you can get 1g. It can be mixed, but it doesn't make much sense. If you want to mix them, it's better to buy the same brand.

Directly packed with 1g.

Hehe. DDR.

It's better to buy two 512s I think.

The DDR1 generation is no longer in production.

You can mix and use.

Yes, but in order to avoid compatibility problems, you move the host to a place that sells computer accessories and install a 1G memory there, try it there, see if the system is running normally, run programs or something, if you don't move the host, if you encounter a problem. Running back and forth is enough for you.

The '04 machine is estimated to be around DDR400

1G DDR400 is estimated to be higher than DDR2 now, according to what you estimated that the configuration is not very good, so plus, the performance can't be improved much, or save more money to buy a new one.

What works, you can buy it, you can't mix it!

It is recommended that you sell both memory modules to Bison and ask him to buy 2 new memory modules to expand the memory to 1G Now they all use SDRAM No one uses DDR.

Yes, you can remove those two RAMs, and then go and buy 1G back, and plug in the memory slots.

Memory expansion is the division of a portion of space in the storage space (external memory) to act as memory usage, also known as memory fusion technology.

Extended memory is the portion of RAM that is higher than 1MB. Most software that uses extended memory, such as the Windows operating system, requires that the extended memory must be controlled by XMM. In the microcomputer above 386, there are two memory working modes, one is called the real address mode or the real mode, and the other is called the protection mode.

In the real mode, the physical address still uses 20 bits, so the maximum addressing space is 1MB for compatibility with 8086. The protection method uses a 32-bit physical address with an addressing range of up to 4GB.

The DOS system works in a real-world mode, and the memory space it manages is still 1MB, so it can't use the extended memory directly.

To this end, Lotus, Intel, AST and Microsoft have established a standard for the use of extended memory under MS-DOS, namely the Extended Memory Specification XMS. What we often see in the files are drivers that manage extended memory.