A Tale of the Slow CPU – Dell OptiPlex 7050 Running on 0.79 GHz

Last week I stumbled across a good deal on Amazon for a batch of refurbished Dell OptiPlex 7050 Micro machines. The machine was from the i7 SKU, and they came with 32 GB RAM and a nice Samsung EVO NVMe SSD.

My thought was them being a great edition to my existing fleet of 7040's, that I had for years. The intended workload for these machines were strictly Hyper-V hosts, and for that the old 7040's have been absolutely great.

ConfigMgr taking forever to install…

Installing ConfigMgr on the old 7040 machines, having the same CPU as the new 7050's, same NVMe SSD, typically took about 25 minutes, but on the new 7050's it took a good hour and half. Why???

I quickly realized it was the CPU that was the bottleneck. For whatever reason it was running on 0.79 GHz instead if the usual 3.3, 3.4, or 3.5 GHz.

Task Manager showing the 0.79 GHz throttled CPU

The Research

The first thing I tried was making sure the machines had the latest BIOS update installed. That did not help, but now I was at least using that. Time to enable enhanced research mode.

After a bit of research (well, Google), I stumbled across an article at the Dell support site that claimed the 0.79 GHz CPU limit could be related to the Real Time Clock (RTC) needing a reset. So, I tried that at first, borrowing steps from the Dell OptiPlex 7050 user manual that told me to hold the power button down for 20 seconds. That did not help, still had the same issue afterward.

More research (more Google), reading about people recommending disabling Intel Speedstep and Intel Turboboost in BIOS. Tried that, did not help.

Others suggested clogged CPU heatsinks or lack of cooling paste in between the CPU and the heatsink, but no, that looked ok as well.

Finally stumbled across a comment about trying a different type of power adapter, so I borrowed one of my OptiPlex 7040 adapters, which specification-wise are the same as the OptiPlex 7050 adapters. But low and behold, after changing the adapter, the CPU started to operate in full speed.

Temporary Workaround – Using ThrottleStop

Needless to say, once figuring out it was the power adapter, I simply ordered new ones, but this time for a 7040, that I will use with the 7050. But since I wanted to get going with my lab, I temporarily used the good old CPU tweaking tool ThrottleStop, that allows you override CPU throttling in real-time. You can download the tool here: https://www.techpowerup.com/download/techpowerup-throttlestop/

By using the ThrottleStop tool I could immediately disable Turbo which unlocked the 0.79 GHz throttle and brought the CPU up to 3.4 GHz. #Shiny

ThrottleStop 9.4 in action

New Power Adapters Arriving

Today the new power adapters arrived, and just like that, super-speed is back on the machines. In the below picture the adapter to the left is one of the borked adapter, and the adapter to the right is the adapter providing the right power to the machines.

Left = Broken, Right = Working
The CPU running as expected after getting new power adapters.

Happy Deployment / Johan

About the author

Johan Arwidmark

5 7 votes
Article Rating
Subscribe
Notify of
guest
27 Comments
Newest
Oldest Most Voted
Inline Feedbacks
View all comments
Romasato
Romasato
7 months ago

Anyone knows the model/part number for 65W TDP i7-7500 (non-T) CPU power adapter? It is supposed to be the 130W one.

Profwalken
Profwalken
10 months ago

Found this on another forum and it did help for me

Seemingly this "Intel Management Engine driver ver:11.0.0.1156" was causing it.

https://www.wintips.org/fix-cpu-not-running-at-full-speed-in-windows-10/#method-4

Method 4 in this guide worked for me

Profwalken
Profwalken
10 months ago

in step 4 this is not to disable itelppm service but to force cpu to stay at its max speed since pc starts

Profwalken
Profwalken
10 months ago

Also as another guy said , I ordered a power charger 65W new from Dell same as your photos, bur when I 've plugged it to my 7050 then at boot bios said I need a 130W ans then reboots in 30 sec and loop on that, so for me 65W has not been a fix.

Dominic
Dominic
10 months ago
Reply to  Profwalken

I'm using a Dell 65W power supply for my 7050M (i5-7500) with 32Gb ram, Wifi-6E, one 500Gb NvME SSD and a 250Gb SATA SSD. No issue at all.

BernRa
BernRa
1 year ago

hey Johan, thanks so much for this. I was playing around with several of these that I got from eBay, and Geekbench said that the i7-7700 was working at like 1/5 of an i5-7500; definitely confused me. I did get some power management error on boot up though, so I should have connected that to the Ali Express (Ali Express means quality!) power supplies that I had gotten. just ordered the ones you suggested (just one at first 😉 ). and thanks again.

karnadi
karnadi
1 year ago

hi, i want to ask, your dell optiplex 7050 can using dual monitor ? i try to put second monitor on DP Port but not working, any suggestion ?

Danny
Danny
1 year ago

Hi I purchased the 7050 micro a few days ago and I noticed i'm having the same issue with the Base CPU and SPEED stuck at 0.79ghz. I'm having an issue locating the 7040 power adapter but not sure where I can buy one. I try google search for the CN-0mgjn9-loc00-9be-2027-a08 but nothing comes up. Is there a link u can provide so I can try to get this fixed? Thank you.

BernRa
BernRa
1 year ago

that link is for a 65 watt power adaptor. my 7050 i7 needs 130 or watt. im wondering why that 65 working for you? hmmm.

Toni
Toni
1 year ago

But the power supplies are exactly the same, as he says he ordered for Dell optiplex 7040 and apparently it is the same model, only one does not deliver enough power or perhaps has less voltage

Ricky Henager
Ricky Henager
1 year ago

i have had the exact same problem two ifferent times with Two diff adapeters that are to run ay 65 watt in order to get past the 0.79 ghz. I am now encountering this again for a third time and I have used throttle stop to save the day but that doesnt help with macOS when I boot into it on the Dell Machine im not aware of a cpu throttling fix for macOS. It shows reading at 800mhz on the mac boot but the windows is fine with throttle stop. Is thre anyway to mod the bios on binary… Read more »

Emma
Emma
2 years ago

I actually had the same issue with an older Lenovo X1 carbon, I went down the same road as you, except to find that with the x1 carbon's a battery regulator chip can cause the same issue. The only fix was to solder on a new regulator. After doing that, it fixed it for me.

Tony G.
Tony G.
2 years ago

They a lot of times don't get the OEM power brick back from the original owners when buying them and end up shipping them with knock-offs. Have had this happen many times with 2nd hand micros.

Vasistan
2 years ago

I had a same issue, but we had a support ticket with Dell and they managed with some driver. I was using other workaround also.

https://youtu.be/8qrkgtwqwtI

Steve
Steve
2 years ago

My CPU also lacks "cooling pasta" as yours did, but my CPU rubs fine in my whitebox Intel desktop. 😄

Jerry Abouelnasr
Jerry Abouelnasr
2 years ago

lack of cooling pasta in between the CPU and the heatsink 😬

Robert Collewijn
2 years ago

That's amazing, I had the exact same thing with a Dell notebook. When it ran on battery it was no problem, but when I plugged in the power it was very slow. It's took me a while to figure out what exactly was going on. good that you mention it on your website so that people can recognize and solve this problem faster.


>