The system supports up to eight units with two fixed HDMI stacking ports.  The HDMI ports are 1.3a specification, Category 2 High Speed cables, 340 MHz (10.2 Gbit/s).   The cables shipped with the switch are 1m long.

Thanks.  Wondering if you can use longer 3rd party HDMI cables & if so what would be the length limit?

Here is another Post from our community speaking about HDMI cabling options.  

en.community.dell.com/.../20116470.aspx