If you want to add more RAM to your computer, you'll need to know the maximum amount supported by your processor.
When you're ready to upgrade your computer to maximize its performance, one of the first considerations is physical memory. Physical memory or "RAM" has one of the most noticeable effects on overall performance, so knowing how much of it your system will support is crucial.
Maximum RAM for Pentium 4
The maximum amount of RAM that your Pentium 4 processor is capable of addressing is 4 GB. This number applies to all speed rated Pentium 4's, from 1.3 Ghz to 3.0 Ghz.
Limitations
While your Pentium 4 can handle up to 4 GB of physical memory, bear in mind that your chipset and motherboard may limit the maximum installable RAM to a number less than 4 GB.
Looking up your motherboard/chipset specifications
The best way to find out your system's max RAM is to use a system utility, like Everest or SiSoft S.A.N.D.R.A. to find out what your motherboard manufacturer and chipset are. Once you have this information, you can look it up on your motherboard manufacturer's website and determine the maximum amount of memory your motherboard can handle.
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