Hi, I have MP1,1 upgraded with X5365s. Previously it had Xeon 5130s in it. It runs 10.9 using Tiamo's boot.efi The machine has occasional kernel panics, on average once a month (it runs 24x7 since 2009). The panic reports usually mention "Machine Check at ... / com.apple.driver.AppleIntelCPUPowerManagement" The panics started before I changed the CPU or hacked the OS. They occur without any correlation to load or running applications - i.e. I can have it running Handbrake jobs with 100% CPU utilization for couple of days without any issue and sometimes it panics being completely idle. When I run Apple Hardware Test, it reports "4SNS/1/40000001: VMBS" error. Does anyone know what this error means? I did some research and there are conflicting opinions - people mention logic board failure and say that "4SNS" means some kind of sensor. Thank you.