Do 690's not have 2 DVI-I out ports?
As long as it is an "active" adapter you can go DP -> VGA.
HDMI may not have the analog video you require. Most of the cables I see have this "Note : This cable don't support signal from VCR, COMPUTER or LAPTOP output, only support DVD Player output." and here is the interesting part. "Fully HDCP Compliant to provide the highest level of signal quality" HDCP does NOT work on analog at all and the cable would have to be active to make it "work".http://support.amd.com/us/eyefinity/Pages/eyefinity-dongles.aspx
I was always under the impression that the stock 6970 had 2 DVI-I ports.