My system has started running incredibly slowly, and this problem occurs after the system is running for about 20 minutes. See this video for what I’m working with (sorry for my shaky arms).
Suffice to say, it is running too poorly to even shut down normally, and I have to hold down the power button.
After I am able to get back into Windows, it works normally for a while before the problem reoccurs. The system worked without issue for about two years. I recently expanded my storage using two Seagate Ironwolf ST4000VN008 drives (one internally via SATA2, one running as a backup in an external USB2.0 enclosure). This problem started occurring after I installed this drive. The video above was taken after I removed all expansion cards and left only my SSD connected via SATA 2.
I am not fully certain what the 100 degree temperature shown in the video is, but I think it might be the Northbridge. The Northbridge heatsink is exceedingly hot to touch. Here is a slightly more detailed description in SpeedFan
*Super Micro X8DTL-i
*x2 Intel Xeon L5630
*x2 Freezer 12 CPU fans
*8GB (2X4GB) DDR3 ECC REG. MEMORY FOR DELL PRECISION WORKSTATION T5500, T7500
*Cooler Master MWE 500 Bronze
*SYBA SY-PEX40039 2 Port SATA III PCI-e 2.0