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I have a host machine with 4 GB RAM and Win XP Pro 32 bit.Now my host machine is using approximately 1.5 GB of RAM and at max it can use 3.25 GB (approx) RAM. SO I have around 0.75 GB (approx) RAM left unused. I am creating a virtual machine with VMware Player 5.0 for windows 8 32 bit. Can I allocate 2.5 GB RAM to this virtual machine? I am wondering if my virtual machine can use the wasted RAM.

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You can try a tool named Gavotte Ramdisk to creates a virtual hard drive in the extra RAM memory and utilize unused RAM of your machine. Personally, I've found it very useful.

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No. It can't be accessed because it can't be mapped. You need to use a 64-bit host OS.

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