Microsoft Windows 7 32-bit and 64-bit
motherboard is required for all SLI configurations. NVIDIA recommends a PCI-E 2.0 x16 motherboard for the best performance. Please make sure you have updated your motherboard SBIOS to the latest version.>
NVIDIA® GeForce® GTX 295, GeForce GTX 590, and GeForce GTX 690 cards do not require an SLI motherboard and work on all compatible motherboards.
2GB is required (4GB is recommended for 64-bit operating systems).