I'd be happy to capture a clone copy of my Z600 (version 2 with the later boot block date) which is running two X5765 currently. Could it be possible that some arcane BIOS setting is holding you back?
You can capture your personal current BIOS settings via HP Replicated Setup, save those out, import mine, see if that helps, go back to yours. All that works very well, and the Replicated Setup files are small .txt files that you also can print out and compare side by side.
PM me with your email address if you want me to send you a copy.....
