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When you hot add memory to virtual machines with Linux 64 bit, Windows 7 or Windows 8, 32-bit guest operating systems, you cannot increase existing virtual memory to more than 3GB
The following conditions apply to hot adding memory to virtual machines with Linux 64 bit, Windows 7 and Windows 8 32 bit guest operating systems.
If the powered-on virtual machine has less than 3GB of memory, you cannot hot add memory in excess of 3GB.
If the virtual machine has 1GB, you can add 2GBs.
If the virtual machine has 2GB, you can add 1GB.
If the virtual machine has 3444MB of memory, you can add 128MB.
If the powered-on virtual machine has exactly 3GB memory, you cannot hot add any memory.
If the powered-on virtual machine has more than 3GB of memory, you can increase the virtual machine memory to 16 times the initial virtual machine power-on size or to the hardware version limit, whichever is smaller. The hardware version limit is 255GB for hardware version 7 and 1011GB for hardware version 8.
Linux 64 bit and 32 bit Windows 7 and Windows 8 guest operating systems freeze when memory grows from less than or equal to 3GB to greater than 3GB while the virtual machine is powered on. This vSphere restriction ensures that you do not trigger this bug in the guest operating system.
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