Hi Trans am, I had this same issue on my X800XL with Aquamark 3. There is a patched DLL that allows the program to successfully complete on newer video cards since the program is out of date since the newer cards came out and is no longer being worked on. You can find the new DLL here.
http://www.aquamark3.com/direcpll-153.zip
simply unzip this into the root directory overwriting the other and you should be fine to complete the run from now on. Let us know how you make out.
As for my issue I have looped 01, 03 and 05 for at least 30 mins each and no more reboots. No clue what happened that one time but I wish it didn't as that is all that is on my mind now. I have a quality psu at 600w running nothing more than is in sig. Should be more than enough for this setup as some people are running SLI with dual GTX on 520w psus.
Tomorrow morning when I get in from work I will be mounting my new cooling to start getting down and dirty with this card that I hope does well.
Wondering, what are you guys getting as default stock voltage on your core when loading up the ATI overclocking utility? Mine is 1.10. I thought it was suppose to be lower than that but I could be wrong. You guys are the same right? And 1.95 for ram and I/O? Im sure people said it was 1.05/1.90/1.90. I may have a :banana::banana::banana::banana: card that needed more volts so they bumped this card up a bit to make it stable. IF that is the case would they really make cards tailored individually from others?