Is there a separate power header to provide adequate 12V to the Firewire ports?

Yes. Card has a SP4 (4 pin; Small Drive Power) Male header, i.e. floppy drive power header. Described in more detail at the StarTech website.

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StarTech.com 3 Port 2b 1a Low Profile 1394 PCI Express FireWire Card Adapter Model PEX1394B3LP

Model: PCIe to FireWire

Add 2 native FireWire 800 ports to your low profile/small form factor computer through a PCI Express expansion slot C 3 Port PCI Express FireWire Card C PCIe FireWire Adapter Card
Includes full/standard profile installation bracket
2x FireWire 800 and 1x FireWire 400
Native PCI Express chipset

Overview

Specs

Reviews (4)

Add 2 native FireWire 800 ports to your low profile/small form factor computer t

Model
Brand	StarTech.com
Model	PEX1394B3LP

Details
Type	PCI Express to 1394 Card
External 1394 Ports	2 x 1394b 1 x 1394a
Standard	1394A x 1/1394B x 2
Data Transfer Rate	FireWire 800 IEEE-1394b - 800 Mbit/s
Operating Systems Supported	Windows 2000, XP, Vista, 7, 8, 8.1, 10, Windows Server 2003, 2008 R2, 2012, 2016, Mac OS 10.6 to 10.12, Linux 3.5.x to 4.4.x LTS Versions Only

Features
Features	Two 9-pin FireWire 800 ports, each with transfer rates up to 800Mbps One 6-pin FireWire 400 port, each with transfer rates up to 400Mbps Includes full/standard profile installation bracket Built with a native PCI Express chipset, no bridge chip Internal power connector for high-powered FireWire devices Compliant with IEEE 1394b and backwards compatible with IEEE 1394a - 2000 as well as 1394-1995 standards Plug-and-Play and hot-swap compatible

Dimensions & Weight
Dimensions	0.80" x 2.30" x 3.50"
Weight	1.40 oz.

Manufacturer Warranty
Parts	1 year limited
Labor	1 year limited

Additional Information
Date First Available	April 28, 2010

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Warranty Notice:
This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.