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Da ali po defaultu WinXP x86 može adresirati samo 2GB memorije, tako da to što on fizički "vidi" - virtualno ne koristi...
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Tom's Hardware kaže:
"Most users will be sobered when they equip their systems with 4 GB of RAM and find that only 3 GB is recognized by the BIOS and by Windows. This is neither a bug nor due to any hardware error. The explanation is simple: 32-bit systems can only address up to 4 GB of memory. Additionally, many add-in cards and on-board controllers require memory addresses in order to be accessible. This is called "Memory Mapped IO" (MMIO). Since this memory range has to lie within the 4 GB, it is subtracted from the installed and available RAM.
Thanks to a technique called memory remapping, it is possible to move around parts of the system memory in such a way that the full 4 GB is still available for use. The trouble is that this feature had to be deactivated in Windows due to compatibility issues.
In order to be able to utilize the entire system memory, you will therefore need to use a 64-bit version of Windows. In this article, we will take a look at memory usage under the 32-bit and 64-bit versions of Windows, and analyze how the operating system behaves with different amounts of RAM."
Neznam od kud tebi da radi samo sa 2GB...moze raditi max sa 4GB, ali trebaju sustavu adrese i za druge kartice i kontrolere u sustavu, pa je zato moze raditi max sa onih 3,25 ili 3,50GB...
Ali XP ionak ne trosi tak puno memorije ko Vista, tak da nije tolko bitno ...