Question about NVIDIA RTX Titan

Yes - it has. But the LSI bridge is not included - it must be ordered separately. It is available with 3 or 4 slots.
But to be honest, it's so fast that SLI doesn't really help much. You can't get more than a perfect picture in real time, can you? SLI with this card only makes sense when you go to 8K.

The card would support SLI, or NV-Link, but in my opinion it is wasted money if you do NOT need it for professional work.