Multi-GPU configurations require more RAM. 32-bit operating systems cannot address more than 4 GB of RAM and with each attached video card also reserving some of this address space, 3-way and 4-way configurations can run out of memory regardless of how much physical memory you have on the system. A 64-bit operating system is recommended for multi-GPU configurations.
3DMark 11 crashes when running on 3-way or 4-way SLI/Crossfire with 32-bit Windows
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