Any other 560 ti will do, though if you go with a 1GB card, you'll have 1GB in the end. So if you can find another with 2GB it will be better. Make sure it's the not the one with 448 cuda cores, it's a different gpu...
yea i want a 2GB and ty for all your help
i aways thought you had to have the 2 same cards to do that