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  1. #1
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    How to save Energy with a Core i7 930?

    So I used to run my cpu at 4.2Ghz 24/7. Now my bills are so freaking high and all I run is my desktop. Anyway I don't know why it's not clocking all the way down to below x12 multi. I have it bios under volted to 0.850V since it's the minimum allowed and have the cpu multiplier at x12. In windows it never goes below the minimum. My question is how do I get my core i7 which is in x12 multi and clock down during it's ultra low voltage power states going below 0.850V? and possibly below x12 multi? I think I'm saving a ton of power from before and the pc still feels really fast even all my games run fine at 1.6Ghz (Including Battlefield3). By the way I have all the bios C states enabled as well as step speed and auto demotion etc.

    THANKS FOR YOU HELP, and I hope you can.
    -Intel Core i7 930 @ 4.533Ghz Max (Lapped) ***~51,941 CPU QUEEN~***
    -Cocage True Spirit (Lapped)
    -6GB OCZ DDR3-1600 @ DDR3-1600
    -ASUS RAMPAGE II GENE
    -ASUS & ZOTAC GeForce GTX 470s SLI @ 851Mhz Core, 1702Mhz Shader, 1875Mhz Memory @ 1.1625v ---- Stats are 68 Billion Pixels per second, 90.8 Billion Texels per second, and 300,000 Mega Bytes per second memory bandwidth with 640bit GDDR5.
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  2. #2
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    Re: How to save Energy with a Core i7 930?

    What do you have your windows "power profile" set to ?

    And have you set the "optimized defaults" in the bios ?


  3. #3
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    Re: How to save Energy with a Core i7 930?

    Power profile was at balanced. Now I'm running at power savings mode. No I haven't reset to defaults. I want to save the most amount of power as possible. I have multi at x12 clock at 133 and vcore at 0.850V in bios with all power saving options enabled in bios.

    I'm wondering on what I could do to my system to effectively reduce energy consumption. Would my 1000w power supply be very efficient operating at low power consumption than say a lower W power supply? Does a 1000W power supply pull more from the wall at a 200W load than a 550W power supply at a 200W load? What specific options should I use in bios for MAXIMUM power savings? Should I force 1 C state for the more power savings? Like for C6 state or something? What about enabling ACPI 2.0? Over 1.0?
    Last edited by chris89; 11-15-2011 at 02:11 PM.
    -Intel Core i7 930 @ 4.533Ghz Max (Lapped) ***~51,941 CPU QUEEN~***
    -Cocage True Spirit (Lapped)
    -6GB OCZ DDR3-1600 @ DDR3-1600
    -ASUS RAMPAGE II GENE
    -ASUS & ZOTAC GeForce GTX 470s SLI @ 851Mhz Core, 1702Mhz Shader, 1875Mhz Memory @ 1.1625v ---- Stats are 68 Billion Pixels per second, 90.8 Billion Texels per second, and 300,000 Mega Bytes per second memory bandwidth with 640bit GDDR5.
    -2TB_RAID0 Black Edition, 500GB_RAID0, 2TB Green Edition, 1TB Baracuda Drive
    -Lian Li PC-V354 Case - **Custom Modding In Progress**
    -Kingwin MK-1000W Black Premium Edition Power Supply
    -PIONEER VSX-520-K HOME THEATER 3D HIGH DEFINITION RECEIVER
    -Dayton Audio Dayton HTP-3 5.1 Home Theater Package 12" Powered Subwoofer
    -Samsung LN40B500 40" 1080p LCD HDTV

  4. #4
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    Re: How to save Energy with a Core i7 930?

    The processor will have little to do with power savings at this point...

    If I had to guess, Most of your idle power consumption would be from running 2 vid cards.

    Each vid card (under load) draws 215w whereas the processor (at stock & under load) is 130w.

    Do you have a Kill-a-Watt or something similar to test with?


  5. #5
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    Re: How to save Energy with a Core i7 930?

    Well I know my bill said I'm consuming 800kwh roughly. Right now I'm running 1 GTX 470 and when Idle I have it undervolted to 825mv and underclocked where it stays 90% of it's time. My cpu is set to 1.6Ghz from 4.2Ghz and I turned the voltage from 1.425V to 0.850V. Hopefully when I get my next bill I will see a good 100kwh reduction hopefully more! So is there anything I can do in my motherboard bios like the EPU engine or something to reduce total system power consumption? Or the Phase Changing system within the BIOS? And What about ACPI and AHCI settings in BIOS?

    THANKS
    -Intel Core i7 930 @ 4.533Ghz Max (Lapped) ***~51,941 CPU QUEEN~***
    -Cocage True Spirit (Lapped)
    -6GB OCZ DDR3-1600 @ DDR3-1600
    -ASUS RAMPAGE II GENE
    -ASUS & ZOTAC GeForce GTX 470s SLI @ 851Mhz Core, 1702Mhz Shader, 1875Mhz Memory @ 1.1625v ---- Stats are 68 Billion Pixels per second, 90.8 Billion Texels per second, and 300,000 Mega Bytes per second memory bandwidth with 640bit GDDR5.
    -2TB_RAID0 Black Edition, 500GB_RAID0, 2TB Green Edition, 1TB Baracuda Drive
    -Lian Li PC-V354 Case - **Custom Modding In Progress**
    -Kingwin MK-1000W Black Premium Edition Power Supply
    -PIONEER VSX-520-K HOME THEATER 3D HIGH DEFINITION RECEIVER
    -Dayton Audio Dayton HTP-3 5.1 Home Theater Package 12" Powered Subwoofer
    -Samsung LN40B500 40" 1080p LCD HDTV

  6. #6
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    Re: How to save Energy with a Core i7 930?

    Quote Originally Posted by chris89 View Post
    Well I know my bill said I'm consuming 800kwh roughly. Right now I'm running 1 GTX 470 and when Idle I have it undervolted to 825mv and underclocked where it stays 90% of it's time. My cpu is set to 1.6Ghz from 4.2Ghz and I turned the voltage from 1.425V to 0.850V. Hopefully when I get my next bill I will see a good 100kwh reduction hopefully more! So is there anything I can do in my motherboard bios like the EPU engine or something to reduce total system power consumption? Or the Phase Changing system within the BIOS? And What about ACPI and AHCI settings in BIOS?

    THANKS
    I'm confused by what you're trying to do. If its that big of a deal, then your best bet would be to run everything stock with the speed-step enabled and then shut your PC down when you're not using it. Do you know what percentage of your total power bill is represented by your PC usage? You say 800kWh, but if thats your total bill including lights, TV, fridge, dishwasher etc etc then theres very little chance you'll see a 13% reduction in the total bill from the changes you said you've made so far. I've got a 4ghz i7-950 with 2 GTX 460's that runs at 100% load 24/7 and it uses approx 300 kWh with no power reductions at all. I think your total PC power usage may be less than you think it is.

    As mmettin suggested, for further testing you may consider looking into a kill-a-watt unit to quantify the changes you're making


    Trust me, I do science
    My Hardware, Past and Present

  7. #7
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    Re: How to save Energy with a Core i7 930?

    those two video cards take more watts than that CPU OCed to 4.2ghz...

  8. #8
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    Re: How to save Energy with a Core i7 930?

    Running dual vid cards and keeping that 40" lcd tv on a lot will increase that electric bill.......

    Why not use a pc monitor? More pixels on a smaller screen will give you a better image (much more sharp). ACTUAL 720p or 1080p on an LED lit lcd screen (22/23/24") will be more energy efficient and DEFINITELY give you better IQ.
    Last edited by Mountain Mania; 11-23-2011 at 11:13 AM.

  9. #9
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    Re: How to save Energy with a Core i7 930?

    Are you putting it in standby when not in use?

    If it's only on a few hours a day it's not going to have a big impact on your electric bill.

    Say you ran it full load for 3 hours a day consuming 600w. That's 600 x 3 = 1.8 kwh per day or 54 kwh per month. That's less than 7% of your 800 kwh total usage.

    Or if you use it for something like work (mostly productivity stuff) for 10 hours a day at maybe 300w (just guessing) that's 3.0 kwh per day or 90 per month. Still only 11% of your total usage.

    If you are just "using" it and not doing something like folding then it isn't going to cost you more than $10 per month, maybe $15 at most.
    If you enjoy gaming click here to learn about the Fragging Frogs.





    [Proudly using only AMD desktop CPUs since 1996 and now also GPUs in 2014 - Thanks AMD!!]
    My Rigs - My Upgrade History - My Games

  10. #10
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    Re: How to save Energy with a Core i7 930?

    Quote Originally Posted by Lenny View Post
    Are you putting it in standby when not in use?

    If it's only on a few hours a day it's not going to have a big impact on your electric bill.

    Say you ran it full load for 3 hours a day consuming 600w. That's 600 x 3 = 1.8 kwh per day or 54 kwh per month. That's less than 7% of your 800 kwh total usage.

    Or if you use it for something like work (mostly productivity stuff) for 10 hours a day at maybe 300w (just guessing) that's 3.0 kwh per day or 90 per month. Still only 11% of your total usage.

    If you are just "using" it and not doing something like folding then it isn't going to cost you more than $10 per month, maybe $15 at most.
    even running at 600w 24/7 is "only" 430 kWh. a pair of 470's will run pretty hot and heavy so peak load may be north of 600w at full tilt, but still.. with all the stuff OP is talking about having done, I'd wager that 90% of the time the usage is much lower than 600w... so yea, I don't think the PC is OP's biggest consumer of juice!


    Trust me, I do science
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  11. #11
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    Re: How to save Energy with a Core i7 930?

    Quote Originally Posted by Lenny View Post
    If you are just "using" it and not doing something like folding then it isn't going to cost you more than $10 per month, maybe $15 at most.
    Well from my experience, running a PC like that constantly will increase your bill by more than $15. FOlding for a month straight on my i7 930 OCed to 3.8ghz added an extra $30, and this was during winter when we don't have the AC turned.

    If I have the PC on like that during the summer then I'm looking at a $300 bill due to the added work the AC has to do to keep the apartment cool as the PC will heat up the room and my 2bedroom apartment.

  12. #12
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    Re: How to save Energy with a Core i7 930?

    I just got my most recent bill and it went from $150 to now $94 just from running at 1.6Ghz and 0.850v on the cpu 24/7 light usage and mostly idle. So I'm thinking I'm sitting at damn near peak efficiency. I think it was consuming about 5 times more energy at 4.2Ghz 24/7 @ 1.45V compared to now 1.6Ghz @ 0.850V vcore. I undervolt my single gtx 470 and underclock 99% of the time. That's interesting to know about 1 watt use in an hour equal 1kwh. I'll update once I get the kwh usage reading.

    Thanks

    BTW - I'm in a standard sized 2 bedroom apartment.
    Last edited by chris89; 12-07-2011 at 07:26 PM.
    -Intel Core i7 930 @ 4.533Ghz Max (Lapped) ***~51,941 CPU QUEEN~***
    -Cocage True Spirit (Lapped)
    -6GB OCZ DDR3-1600 @ DDR3-1600
    -ASUS RAMPAGE II GENE
    -ASUS & ZOTAC GeForce GTX 470s SLI @ 851Mhz Core, 1702Mhz Shader, 1875Mhz Memory @ 1.1625v ---- Stats are 68 Billion Pixels per second, 90.8 Billion Texels per second, and 300,000 Mega Bytes per second memory bandwidth with 640bit GDDR5.
    -2TB_RAID0 Black Edition, 500GB_RAID0, 2TB Green Edition, 1TB Baracuda Drive
    -Lian Li PC-V354 Case - **Custom Modding In Progress**
    -Kingwin MK-1000W Black Premium Edition Power Supply
    -PIONEER VSX-520-K HOME THEATER 3D HIGH DEFINITION RECEIVER
    -Dayton Audio Dayton HTP-3 5.1 Home Theater Package 12" Powered Subwoofer
    -Samsung LN40B500 40" 1080p LCD HDTV

  13. #13
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    Re: How to save Energy with a Core i7 930?

    Actually 1000w per hour is 1 kwh.
    If you enjoy gaming click here to learn about the Fragging Frogs.





    [Proudly using only AMD desktop CPUs since 1996 and now also GPUs in 2014 - Thanks AMD!!]
    My Rigs - My Upgrade History - My Games

  14. #14
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    Re: How to save Energy with a Core i7 930?

    Quote Originally Posted by Lenny View Post
    Actually 1000w per hour is 1 kwh.
    Yep that makes a lot more sense. I suppose 1 watt in an hour would be 1mwh lol... Miliwatt.. haha taking it the k stands for 1000 watts... cool im learning something every day.
    -Intel Core i7 930 @ 4.533Ghz Max (Lapped) ***~51,941 CPU QUEEN~***
    -Cocage True Spirit (Lapped)
    -6GB OCZ DDR3-1600 @ DDR3-1600
    -ASUS RAMPAGE II GENE
    -ASUS & ZOTAC GeForce GTX 470s SLI @ 851Mhz Core, 1702Mhz Shader, 1875Mhz Memory @ 1.1625v ---- Stats are 68 Billion Pixels per second, 90.8 Billion Texels per second, and 300,000 Mega Bytes per second memory bandwidth with 640bit GDDR5.
    -2TB_RAID0 Black Edition, 500GB_RAID0, 2TB Green Edition, 1TB Baracuda Drive
    -Lian Li PC-V354 Case - **Custom Modding In Progress**
    -Kingwin MK-1000W Black Premium Edition Power Supply
    -PIONEER VSX-520-K HOME THEATER 3D HIGH DEFINITION RECEIVER
    -Dayton Audio Dayton HTP-3 5.1 Home Theater Package 12" Powered Subwoofer
    -Samsung LN40B500 40" 1080p LCD HDTV

  15. #15
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    Re: How to save Energy with a Core i7 930?

    Quote Originally Posted by chris89 View Post
    Yep that makes a lot more sense. I suppose 1 watt in an hour would be 1mwh lol... Miliwatt.. haha taking it the k stands for 1000 watts... cool im learning something every day.
    nope... that'd just be a single watt-hour. a milliwatt for 1 hour would be 1 mwh

    glad to hear your system isn't eating your lunch money any more. I'm not surprised when you say about a 5x power increase. its a 2.6x frequency increase and a close to 2x voltage increase on your CPU. Power consumption tends to increase in a non-linear fashion.


    Trust me, I do science
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