I have decided to upload my own personally hex edited driver for the XFX Radeon 6670HD 2Gb video card with the HDMI-DVI-VGA setup.
This is modified from a stock 10.9.3 AMD6000Controller.kext file with the Ipomoea personality edited to suit the connectors, encoders and transmitters for this card since they differ from the mac-based display port 6670HD model.
I have tested the HDMI and DVI which appear to work at the same time since i'm dual screening with these connections currently - the screenshots can confirm this. I have yet to test the device using the VGA slot since I have no need for this connector. Hopefully it works all the same.
Install to S/L/E with a utility such as Kext Wizard - backup replacements to be safe - repair permissions and then reboot.
The required bootflags for this kext to be activated are
**You will need to remove any injectors prior from either /Extra or /S/L/E though this is unlikely needed since kext graphics injection is largely outdated.
**Due to the chip on the card triple monitoring is not possible.
Best of luck