i have Intel Pentium 4-524 Processor (3.06-GHz, 533-MHz) with windows xp professional sp2.
currently i hv 1GB RAM.
What is the maximum RAM it can support??
Short answer: Put 2 GB in it and it will be guaranteed to work. If you need more than that, you should upgrade to a current desktop with a current 64-bit OS.
Long answer: Windows XP 32-bit only supports around 3 GB of RAM. If you ever decide to upgrade to a 64-bit OS to support more RAM than that, the maximum amount of RAM you can support depends on the motherboard. The amount supported is going to range from 2 GB to 16 GB depending on if your motherboard has two or four memory slots and supports DDR RAM or DDR2 RAM, and if it supports DDR2 RAM, how large of modules it supports.
If you install a total of 4GB in a PC with Windows XP 32-bit, the maximum amount of available RAM will generally range between 3.2GB - 3.4GB. Win XP can address up to 4GB of RAM, but some of that address space is required for the devices on the motherboard which is why the 4GB of RAM will not be fully available.