M4800 Owner's Thread

Hmmm the box is not already checked. I also reboot the computer but nothing changes then.

 

Anh Tu - That Windows setting is usually the problem. You can also try changing the Number of processors to 8 and then reboot and see what happens.

When you have the command window open, type in this

shutdown /s /t 0

This will make sure that Windows 8 does a full shutdown.

 

@unclewebb: i can't find number of processors to 8, only 1,2,3 and 4, that's strange. I even set to number 4 and did a full restart but still nothing changes

 

Just got an m4800. Currently it has the A08 BIOS. Should I stick with that or go with the A11 BIOS?

 

http://i.imgur.com/SU4chfu.png

A Core i7 should let you adjust this up to 8. You have 4 cores and 8 threads due to hyper threading.

Have a look in your bios. I am not familiar with the M4800 but there might be an option in there that has disabled half of your CPU. If you cannot find anything, try reflashing your bios or update your bios to a different version. Your laptop has a problem. You might have to contact Dell. CPU-Z should be showing 4 cores and 8 threads. Did you change anything in your config file? Are you dual booting Linux or anything like that?

 

Check hyper threading is enabled in the BIOS.


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If you want to be able to use the smaller power supplies from the previous Latitude Laptop generations (90W and up), you need A06.
Otherwise it is probably not a bad idea to go to A11.

The 90W power supplies are easy to get on Ebay for example and besides being MUCH more portable, they also only cost a fraction of the 180W and 240W hulks.

 

I can't test ThrottleStop before the end of the week as my laptop is Linux only and the original drive with Windows on it is a good 450km away.
Does ThrottleStop set the CPU registers only once or do you have dance around with the BIOS and periodically reset the values?

 

My replacement QHD screen part number was JJ74H, my original and replacement were both matte.

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ThrottleStop sets various CPU registers and then monitors the important registers on a regular basis to make sure that they are still at the user requested value. Model Specific Register (MSR 0x199) is called the IA32_PERF_CTL register. This is the main control for all recent Core i and Core 2 CPUs and probably lots of CPUs before that too. Writing values to this register controls the speed your CPU runs at. If software writes an 8 to this register than your maximum multiplier will be limited to 8. It might be something this simple. If we can find out what is going on, there are tools built into Linux so you can duplicate the values that ThrottleStop is writing to this register.