Jeep327The only cards showing problems on the spreadsheet are Nvidia cards. I'm assuming AMD cards don't exhibit the sleep problems, so it's likely a driver issue.
Jeep327I use it on DP and don't have an issue with it going to sleep, BUT make sure to be using the driver that came on the CD. Don't just use the Plug N Play driver that Win7-8 puts in by default. I used the default Windows driver for a bit, and yes would have it making the "windows found new hardware" sound over and over when it went to sleep mode. I haven't had that problem since using the driver off the cd