Can someone please tell me with which card can I SLI it with ? Thanks
The only GPU you will be able to mix it with in SLI is a GTX 650ti BOOST, this is because nVidia GPUs are different than AMD's, because AMD CrossfireX can crossfire two different GPU's (e.g. 7850 and a 7870 or a 6850 and a 6870). As long as they have the same first two numbers.
But as i said nVidia GPU's are different and you can only SLI the same exact GPU.