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You can't SLI them together, but you can use the GT220 as a Physx card. If you just put both cards in (don't put an SLI bridge on) and in the Nvidia control panel set the GT220 for Physx, then it's good.
Computer type PC/Desktop System Manufacturer/Model Number Custom Built OS Windows 8.1 Professional x64 CPU Intel Core i7 965 Extreme Edition 3.2GHz Motherboard ASUS Sabertooth x58 Memory 12GB Corsair Dominator 1600MHz Graphics Card Zotac Nvidia Geforce GTX470 Sound Card ASUS Xonar DX/XD 7.1 Monitor(s) Displays Dell 24" S2409W + Dell 20" E207WFP Screen Resolution 1920x1080 + 1680x1050
Keyboard Logitech G11 Keyboard Mouse Logitech G5 Laser Mouse (2007 edition) PSU Corsair HX850 modular Case Coolermaster 690II Advanced Nvidia Edition Cooling Corsair H60 Hard Drives 1x 120GB OCZ Agility 3, 1x 750GB Western Digital Caviar Black, 1x 1TB Western Digital Caviar Blue Internet Speed 20Mbps Antivirus Microsoft Security Essentials Browser Google Chrome Other Info LG Blu-Ray player