Hi,
Here’s what i found. you can always talk to dell support.
1394 quickly gained a reputation for poor interoperability. The IEEE addressed this issue with a 1998 update dubbed 1394a, which tightened up the spec and improved performance. Interoperability was further enhanced by the 1394 Open Host Controller Interface (OHCI) specification, which defined standard ways for 1394 hardware to interact with host operating systems. Today, compatibility problems are rare among OHCI-compliant 1394 devices, and the interface is becoming more common in mainstream PCs. This is especially true in systems designed for multimedia applications. For more detailed information on 1394 technology, particularly for use in multimedia applications, see our story “FireWire–the Consumer Electronics Connection”. https://www.extremetech.com/article2/0,1697,33848,00.asp
You’ll probably have to call dell support and/or enter your service tag number to get your specs. Also look at your Dell shipper.