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   DatahopaForumComputer RelatedPC HardwareUnderClocking an Intel Q9400

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UnderClocking an Intel Q9400
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Offline Data Topic starter
United Kingdom Administrator
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UnderClocking an Intel Q9400


I’ve been experimenting with the speed of my CPU, wanted to see how slow I could run it but still have enough CPU power to do the every day mundane tasks in Windows. (Not gaming)

Why?
To save power and money, make less heat and at the same time maybe extend the life of my PC.

I successfully got it to run as low as 1.2Ghz @0.85 volts, but at that speed there were signs of a slow down, the worst was in media Center where the PC couldn’t successfully keep the video playback of HD content running smoothly.

I have ended up with a core speed of 1.6Ghz (roughly) and a core voltage of 0.96V, at this speed the PC seems to run almost as quick as default, not really any noticeable slowdown and HD video playback is perfectly smooth.

I have achieved this underclock by setting the multiplier to 6 instead of 8 (the default) and then reducing the FSB until I got to 1.6Ghz.

Then reducing the CPU voltage to a stable place.

Then reducing the RAM voltage to a stable place also.



Q9400_@_1.6GHz.gif
UnderClocking an Intel Q9400
* Q9400_@_1.6GHz.gif (45.37 KB, 384x409 - viewed 420 times.)
Posted June 02, 2012, 11:52:59 AM Logged

Offline Snowcrash
England Global Moderator
Posts: 2229
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Re: UnderClocking an Intel Q9400


Can you tell what the savings are?

You have a plug in power meter. Could see the overall power savings with that. I bet the graphics being underclocked makes a bigger difference but both would be nice to know.


Posted June 02, 2012, 12:01:24 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Data Topic starter
United Kingdom Administrator
Posts: 8570
Rank: Certified

Re: UnderClocking an Intel Q9400


Good point about the power consumption Snowy, I will post some info about it later.   

Posted June 02, 2012, 12:45:35 PM Logged

Offline DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

Re: UnderClocking an Intel Q9400


My biggest question is how difficult it is to revert, when you decide to fire up a game? Are we talking about loading a profile setting? Or a full-on reboot?

Posted June 02, 2012, 18:16:25 PM Logged
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Offline Data Topic starter
United Kingdom Administrator
Posts: 8570
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Re: UnderClocking an Intel Q9400


Yes I do have to reboot and make changes in the BIOS when I need to clock it up, doesn’t take long with the SSD in there.

The hardest part will be remembering the settings  scratch-head   Cheesy

Posted June 02, 2012, 19:05:52 PM Logged

Offline DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

Re: UnderClocking an Intel Q9400


You know, as advanced as other components and technologies have become over the years, you would think that you would see similar advancements with the BIOS. But that hasn't changed (other than the settings themselves) in nearly 30 years. My PC Junior from back in the 80's had nearly exactly the same BIOS architecture as we see today.

Posted June 02, 2012, 19:43:43 PM Logged
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Offline Freddy
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Re: UnderClocking an Intel Q9400


It's a case of if it aint broken don't fix it.

But with regard to under clocking, have you found out if it's worth the hassle Data ?

I don't think I can be bottomed to do that every time.  Shocked

On my PC I have some controls where you can opt for things like performance or eco saving options.  I never use it, I always keep it on performance.

Posted June 02, 2012, 19:48:42 PM Logged

Offline Data Topic starter
United Kingdom Administrator
Posts: 8570
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Re: UnderClocking an Intel Q9400


I have some power readings, this took me longer than I thought it would because I have repeated the tests a few times to absolutely make sure the readings are fair and correct.

NOTES:
The power readings are for the entire PC (tower case)

The graphics card (HD4890) is underclocked in both tests to help give a more accurate reading of the CPU power consumption.



Result.

     @ idle = 27watt power saving

     @ Full load (all 4 cores) = 37watt power saving

     Averaging 15c lower temperature


Summing up.

There is a power saving equal to something like 3 to 4 energy saving light bulbs,  its not a huge amount but over a year its going to add up.

The temperature reduction is the most impressive, the CPU runs so cool I could probably remove the heatsink fan and save another watt or two Grin (not recommended).

Posted June 03, 2012, 13:28:10 PM Logged

Offline Snowcrash
England Global Moderator
Posts: 2229
Rank: Certified

Re: UnderClocking an Intel Q9400


I'd still like to see the power savings by underclocking the graphics card.
Seeing as this is much easier to do. Not requiring a reboot and all that.

I know, I'm a pain in the  sign-oops

Posted June 03, 2012, 13:43:52 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Freddy
United Kingdom WWW Administrator
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Re: UnderClocking an Intel Q9400


How much do you pay per kWh ?

Posted June 03, 2012, 15:13:29 PM Logged

Offline Data Topic starter
United Kingdom Administrator
Posts: 8570
Rank: Certified

Re: UnderClocking an Intel Q9400


Snowy, power consumption savings on the graphics card, new thread.

http://www.datahopa.co.uk/forum/pc-hardware/hd4890-underclocking/


Freddy, there are two prices that I pay, depending on the time of day I think,

Standard = 18.76p.

Reduced =  12.07p

My last electricity bill was £62.30 for a quarter, which I believe is way below the average in the UK and I put that down to all the little power savings I’ve made around the house, Hmm that could be another topic. 

Posted June 03, 2012, 19:31:51 PM Logged

Offline Freddy
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Re: UnderClocking an Intel Q9400


OK so lets say in the region of 15p/kWh

So that's 0.015 pence per Watt.

idle at 27W and loaded at 37W, so lets say an average of 32W...

32W x 0.015 = 0.48 pence per hour

Say the computer is on 12 hours a day.

That's 12 x 0.48 pence = 5.78 pence per day.

So you're saving about 6p per day.

£0.06 x 365 = £21.90 a year saved.

I think that's right.

Posted June 03, 2012, 20:49:13 PM Logged

Offline DaveMorton
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Re: UnderClocking an Intel Q9400



My last electricity bill was £62.30 for a quarter, which I believe is way below the average in the UK and I put that down to all the little power savings I’ve made around the house, Hmm that could be another topic. 

Shocked That's about $31.90USD per month! My computer alone costs that much to run! Our electricity bill runs about 5 times that much for the entire house! Shocked

Posted June 03, 2012, 21:28:05 PM Logged
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Offline sybershot
United States WWW Posts: 1635
Rank: Certified

Re: UnderClocking an Intel Q9400


Overclock the beast, and install some solar panels  Tongue lol

By the way out of curiosity how much is your wei score affected by under-clocking your rig?

Posted June 04, 2012, 00:08:06 AM Logged

Offline DaveMorton
United States WWW Global Moderator
Posts: 3413
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Comfort the Disturbed! Disturb the Comfortable!

Re: UnderClocking an Intel Q9400


lmao... Solar panels. In England...  sign-yeah-right sign-lol yahoo sign-peace sign-great-job

Now if they had some way of power generation that involves rain and gloom...

Posted June 04, 2012, 00:54:36 AM Logged
Safe, Reliable Insanity, Since 1961!
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