Because RDP screws up your temp monitoring. I use RDP only for my BAMT-based rigs, and TightVNC to administer the Win7 rigs. CGRemote for a quick overview at a glance.
Weird, is it a problem with the application(s) used or RDP itself?
RDP plugs into the Windows graphics system the same way a real display driver does, except that, instead of being a driver for a physical video card, RDP is a virtual display driver.
http://blogs.msdn.com/b/rds/archive/2009/03/03/top-10-rdp-protocol-misconceptions-part-1.aspxWindows RDP installs a virtual driver when you connect, and this messes with the order of the physical video cards.
This is why TeamViewer or VNC works, they don't mess with the video devices.