Please try to update your BIOS version at Product Support | Dell US once done, please download the Intel® Processor Identification Utility at Download Intel® Processor Identification Utility - Windows* Version and attach the report.
I have the same problem exactly, it seems:
1. Dell Latitude E7440
2. Updated bios to the latest and - I think - then problems started
3. Tried to downgrade back to the previous bios, but it was of no help
4. specs: Windows 10 64, Dell E7440 with I5-4300U, 8GB Ram, 256GB SSD.
Error: CPU stack at 0.8GHZ, no matter what power plan I'm using
It changes for a few seconds if I pull the power plug out, put the laptop to sleep, waking it up and connect to it to the AC again. It lasts for few seconds though
Before I had this problem, I had a different problem - whenever the laptop was running, if I plugged it to the AC, it would halt. I would have to put it to sleep and waking it up and then it was ok again.
Amy, thanks for your time. I think it is partially solved now:
1. Before I posted this issue, I downgraded the bios (to 01) and upgraded one by one, as some users have recommended. It didn't help.
2. Like some other users have mentioned over other forums, pressing the chassis resulted in changed clocks. I had the same issue. I disassembled the laptop and pin pointed the area and found that specific screw was (part of) the problem, probably pressing the metal plate behind the keyboard on some electrical parts. I've placed some thermal pads there and now it does not happen. Obviously, there is some problem with the hardware or software in this case - not sure at all it's the MB fault.
Anyway, it seems like it repeats itself, so for anyone that reads this - you can ask if you want to know what exactly I did and where it was
Thanks again Amy