Can you crossfire GTX's or is it only SLI?

[weggment]

I have an AMD, AM3+ system with a Asus Nvidia GTX770 direct OC graphics card. i was thinking about getting another GTX770 and crossfiring them together. my motherboard is only compatible with Crossfire and not SLI. my question is: can you crossfire Nvidia GTX's together or can you only SLI them?

 

[datguy20]

Crossfire is AMD, SLI is Nvidia. Simple as that.

The newer AMD cards Crossfire via the PCI itself, and don't use a bridge, but the Nvidia cards use an SLI bridge (sometimes comes with a new card) that plugs them together.

What's your motherboard?

 

[weggment]

Ah OK that's pretty much what i thought.
its a Gygabyte GA-970A-DS3. i know already that it definitely isn't compatible with SLI so ill have to hold out until i have enough for another MB or a gtx 980. or just get an radeon r9 something or other and crossfire those.
many thanks datguy20