Laptop CPU Issue (Underclocked)

February 18, 2011 at 18:02:57
Specs: Windows 7 Home, 4GB
Just when I get my Desktop memory issue resolved here we go with the laptop. I am getting so tired of computers and to think I used to love them....

Intel Core 2 Duo T7250 2.0GHz

I was just using my laptop last night with no issues. I sit down to my computer today and I am getting 5FPS in my game (this is odd because I usualy run at 38-60FPS). I exit the game and hit the event log and low and behold I see the following error "The speed of processor 1 in group 0 is being limited by system firmware". Well well, I open up PCWizard, double check in CPUZ and find that my CPU is running at 797.74MHz and occasionaly jumps to 1194.45MHz and very rarely jumps to 1979.37MHz and this is at Idle (I tryed pushing it with intensive use and there is no change). Bios is up to date (speedstep is enabled in the Bios), all drivers are up to date, windows was just clean installed a few weeks ago and fully up to date. PCWizard shows core temperatures at 44C. What is the deal?

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February 18, 2011 at 19:30:13
"What is the deal?"

You answered your question - "speedstep is enabled in the Bios". Disable it & the CPU will run at full speed but you'll be recharging the battery every 30-60 minutes.

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February 18, 2011 at 20:46:31
Well my laptop 95% of the time stays plugged in. Is there any advantage at all to having speedstep enabled? I have never really read anything about it other then what it does and just wrote it off as something that increased the life of the CPU. Am I right? and would the CPU really lose that much life with speedstep disabled?

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February 18, 2011 at 22:58:34
Just disabled SpeedStep and the CPU is sitting at 1196.64MHz and won't move regardless of the fact that I have ver intensive programs running. Anyone else have any ideas?

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Related Solutions

February 19, 2011 at 08:07:54
SpeedStep is a power saving feature that varies the CPU speed based on load. If the computer is sitting idle, there's no reason for the CPU to be running at full speed so Speedstep will lower it to 800MHz. This conserves battery power & keeps the CPU running cool. This is especially important in laptops because they generally have poor cooling characteristics. Personally, I doubt there's anything wrong with your system, it's working the way it should.

Try a different program to check your CPU settings & try adjusting your power scheme settings as well. Rather than "portable/laptop", set it to "always on".

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February 19, 2011 at 17:06:09
I have my power settings set to always on. I understand all of that. What I don't understand is, when speedstep is enabled the CPU seldomly kicks up from the 800MHz and very rarely hits 2.0GHz and these fluctuations dont happen when I need it to. With Speedstep off it doesnt change from 1196.64MHz at all, so it doesnt hit 2.0GHz at all. I just figured that the speedstep should kick it up when more strenuous activity required it to. I also figured that with speedstep off the CPU would run at 2.0GHz but who knows I guess.

Thanks for the help, if any more ideas arrise let me know.

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February 20, 2011 at 16:11:46
Ok I figured it out. Boy was this a loop to slide through lol. My initial FPS loss was just the game I am guessing but lead me into this ordeal.

Just so anyone else out there is scratching thier heads and has not come to the understanding that I have here is what I have learned. The CPU speed that was being shown is only Core #1's current speed. Now before you go saying well duh, the reason I did not think twice about that being the case is that my CPU is a 2.0GHz and if the speed is at 1196.64MHz that would put me at 2.4GHz. Well, after starring at PCWizard for a while I realised it listed my CPU speed at 1196.64MHz but further down the page listed the individual Core speeds. These were actualy running at different speeds which I then realised it was displaying on only Core #1's speed on the little PC info tooltip it has. Wait a second, what does this mean then? If Core 1 is running at 1196.64MHz and Core 2 is running at 1196.44MHz than wouldnt that mean my CPU is running at 2.4GHz? Well I did some research and found out that my CPU is marketed at 2.0GHz but has some Intel dynamic feature that actualy allows it to run in upwards of 2.2-2.4GHz if I understand correctly. So there you have it I learned something new by doing my research, hope this helps someone else out there. Thank you to those that gave me some help and ideas above.

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