No, windows xp cannot read 4mb ram dude it needs at least 64 mb of ram
Yes Windows xp will work with DDR3 i have a gaming computer with 16gb DDR3 ram in windows xp 64-bit
There is no such thing as "cleaning RAM."
Windows XP can never "run like Windows 7", regardless of the amount of RAM installed.
4gb ram
Windows XP does not have the RAM, its the computer that has it. The amount of RAM can differ for each computer.
Windows XP Home & Windows XP Pro
The operating system is not directly related to the amount of RAM installed. XP can be run on anything from 32 MB of RAM to 4 GB.
4GB
I'm not sure I fully understand your question but I will do my best to answer. You have a 3ghz processor with 1GB of ram. 512mb of ram is enough to run windows XP.
Windows XP can use any amount of RAM, there is no exact amount. The minimum is 256 MB, the recommended is 512 MB, and the best is 1 GB +.
A 32 bit Windows XP can only address 3GB of RAM. To take advantage of all 4 GB and beyond, use 64bit version.
64 MB of RAM is the lowest possible.