Thanks for the time and willingness to share your trials and solutions. I want to buy a skull trail or D5400XS, but am waiting and studying the issue and problems. Why ... because I've been jumped on to many band wagons only to have be the lab rat troubleshooting the new widget. Doesn’t matter if it is Microsoft, Intel, SolidWorks or COSMOS Works, they all release before its ready to keep the money flowing. The first release is always at the buyer’s risk. Don't feel bad, it always works out in the end. You may have guessed, I am a 3D SolidWorks designer since 1997 and have owned every version of Microsoft and SolidWorks up to 2004 and a bought a bunch of systems, all Intel. Guess you are asking SO WHAT! OK, from the system side. Intel does not ship the CPU with any heat sink. Check out Intel’s link
http://www.intel.com/support/motherboards/desktop/sb/CS... , it is a warning on thermal issues. Be careful of the TEC coolers, they are very cold, and can cause as much of a problem as being to hot. Why? Thermal expansion for one thing (Hot and cold cycles can cause micro cracks on PCB BGA solder pads, thru holes on multiplayer boards, but condensation (water collecting on cold surfaces and running under chips can cause corrosion and electrolysis [electric current flowing through a liquid that dissolves metal and re-deposits it in a different place] causing micro shorts between pins). You are doing a good job debug and troubleshooting. My experience tells me you are on the right track. 1) Changing the # Processors in the Task Manager, changes the processor management and loading. This tells me it is an OS problem with XP 64 management of memory threads. Send Microsoft your notes and findings. It may also be in the Intel kernel chip drivers too! Remember, the Intel motherboard is using a new memory controller to control system memory and L1/L2 cache memory, 12MB (2 X 6MB Cache). Check out Intel links
http://www.intel.com/Assets/PDF/prodspec/D5400XS-tps.pd...,
http://download.intel.com/support/motherboards/desktop/...,
http://processorfinder.intel.com/details.aspx?sSpec=SLA.... Yes, cooling the Northbridge is critical, too! Video, Memory. Speed KILLS, This motherboard is the leading edge in speed and power. Each CPU needs or expends 150W of thermal engery. Pushing electrons around that fast generates a lot of heat. This motherboard takes Over Clocking to a new level. Good Luck and hope this helps a little. I’m working on a cooling system to help address some of these problems. Just pumping liquid Nitrogen on the CPU is only part of the thermal design problems. Managing the thermal load is going to take a dynamic active system that continually adjusts the demand on each heat source. Getting Microsoft and Intel to resolve the complex software and hardware issues is going to take a joint effort in providing information to these giants. Take care.