GeForce GTX 580 DX 12 Benchmarks - NVIDIA Enables DX12 on GeForce 400 and GeForce 500 Series Graphics Cards
Zotac Video Card Geforce Gtx 550 Ti 1gd5 Gddr5 192bit Graphics Cards For Nvidia Gtx 500 Series Map Gtx550ti 1gd5 Dvi Vga Used - Graphics Cards - AliExpress
GeForce 600 series - Wikipedia
iXBT Labs - i3DSpeed, August 2011 - NVIDIA GeForce GTX 560 Ti 1024MB 256-bit GDDR5 (822/1644/4000 MHz)