You should try to install the software "Dell Power Manager".
In the "Thermal Management" tab, you need to select option "Optimized".
Your issue might be that you computer is currently locked in the mode "Quiet" or "Cool" which can cause your CPU to be limited at 0.8GHz
For me the solution was to remove the screw below the c-key, as suggested by a few people in the comments to this post (with youtube video): http://triplescomputers.com/blog/casestudies/solution-cpu-throttling-on-dell-latitude-ultrabooks-e74... As an indication: I noted that the core speed would shortly increase after hitting the bottom of the laptop on the left side (i.e. in the area below the c-key).
Thanks for the good guide, it really save my days.....
I have been troubleshooting for 5 days, until I saw this post.
I removed the screw underneath the keyboard, and then the CPU throttling is gone.
Worked perfectly. I work in a company with over 500 Dell E7440 and as the years went by did this issues start to show up and we contacted Dell. No one could give a good explanation to why some of our E7440 out of the blue started to act up and even send a service guy. He did the debugging and diagnostic and no of them gave error or reported an issue. So they concluded it was a defect motherboard or CPU. Unlucky for us had the warranty already ran out and and buying parts costed the same as a new laptop.
After long time looking did i finally came across this answer and a youtube video and i was a little.. Yeah..you are pulling my leg right? and i tried it and boom the CPU went up to 100% and the right clock speed like nothing was wrong.
I did notice a minor details, that was the crashes that happened afterwards. I think i solved the issue by putting a piece of tape underneath the metal plate and the motherboard. So the plate where the keyboard is attached to can't touch they motherboard.
tengo un DELL LATITUDE E7440 con procesador Intel core i5 – 4310U, 8Gb de RAM y ssd de 250 GB.
he probado retirar la bateria y encenderla solo con el adaptador AC y arranco super bien, rondando los 2,9Ghz, pero luego de un minuto volvio a estancarse en 0,78GHz. Cuando presiono la parte inferior del portatil, debajo de la letra c, la frecuenci vuelve a aumentar, intentare retirar el tornillo
Go to BIOS, by pressing F2 on start up , than go to Performance, and click on +. Find Option Intel SpeedStep TM, and Disable it.
By this operation CPU will be working on highest performance. However this will for sure decrease the battery state, but will solve the issue with CPU itself.
No need for removing the screw underneath C letter, or other removal interventions.
Problem should be investigated deeper.
NOPE...I've turned off Speedstep on other Dell's and it fixed the slowness issue, But not on this 7440. BIOS A28.
ThrottleStop WILL turn it on full speed, but that's a pain as it needs to be run every time.
REMOVING THE SCREW under the 'C' key worked for me, too.
You'll need Phillips (P) and fine-tipped Flathead (F) screwdrivers or one of those Apple iphone tools - Spudger (S).
I also confirm that removing the P screen under the C key worked!
I have a 5+ year old latitude E7440 that was stuck at 0.78 GHz. I first tried to reset the BIOS by unplugging and replugging the CMOS battery. That didn’t work. (btw - that initially caused my computer to brick. (Solved thanks to https://www.dell.com/community/Latitude/Dell-Latitude-E7440-won-t-boot/m-p/7352541/highlight/true#M1...)
I followed instructions from @PowderGeek and that fixed the issue.
at first my keyboard didn’t work upon reassembly. I found that the connecting cables became unplugged while I removed and reinstalled the keyboard. They’re funky flat ribbons that snap into a connector. I learned how to reconnect keyboard cables by consulting pics here: Look at KeyBoard section of this link
Now my computer is fully restored! Happy Days 🙂
Thanks to all for sharing your discoveries!
Yes, I confirm the screw remove fix works. My reaction was <Profanity removed>?!?
I have 2 questions :
1. Who/how did this fix get discovered?
2. What is the screw used for?