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Thread: CPU Overclocking

  1. #1
    Plane Walker FinalplayerRyu's Avatar
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    Default CPU Overclocking

    So while i understand the idea and principles behind GPU Overclocking, i am still quite puzzled with CPU Overclocking.

    So here is my setup:
    CPU: Intel Q8400, 4 x 2.66 GHz
    RAM: 2 x 2GB DDR2 800 MHz
    MBoard: ECS G31T-M7 Socket 775

    http://img268.imageshack.us/img268/7660/cpubn.jpg . http://img23.imageshack.us/img23/7044/ramgk.jpg

    So hereīs the situation, my motherboard allows only up to DDR2 800 MHz RAM, well thats fine, but the standard setting of my cpu with rated FSB 1333 are forcing down my RAM also to 667. So my idea was to increase the bus speed to 400, hence multiplied with 4 gaining a FSB of 1600 to match the speed of the RAM.

    That was the plan until i took a look at my Mainboard Specifications that states that FSB 1333/1066 MHz are compatible, so now the question to you guys: Does that mean that if i increase the Bus Speed/FSB that there is no gain from it, since Motherboardīs Limit is 1333 MHz? or do i understand here something completly wrong? :O


  2. #2
    Champion of Telara Forum Troll's Avatar
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    Your motherboard has an extremely limited bios, I wouldn't recommend it for overclocking at all.

    Can you unlink the ram from the fsb?
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    Plane Walker FinalplayerRyu's Avatar
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    When you mean with unlink that i can set the Clock of my RAM... yes, to 667, 800, 1000 and 1100. I also can set the bus speed, multiplier and the voltage... anything else you would need for overclocking?

    Btw. i should mention that i really just want to match ram and cpu. I dont intend to overclock more than that.

    EDIT: And my main question is still unanswered^^...
    Last edited by FinalplayerRyu; 02-09-2011 at 01:27 PM.


  4. #4
    Telaran
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    Quote Originally Posted by FinalplayerRyu View Post
    When you mean with unlink that i can set the Clock of my RAM... yes, to 667, 800, 1000 and 1100. I also can set the bus speed, multiplier and the voltage... anything else you would need for overclocking?

    Btw. i should mention that i really just want to match ram and cpu. I dont intend to overclock more than that.

    EDIT: And my main question is still unanswered^^...
    Ermm 1333/333 and memory is almost 400 too ( u need multiply that 2 x) so its at 800 mhz so whats the problem? I hope your core voltage is not at 1.776 or even near it because its way too much and check it in bios (normal around 1.3625 v).

    I am running my cpu with these settings 24/7 and my motherboard only supports too 1333/333 , 800 mhz ddr2 etc. but doesnt mean nothing when doing OC with decen motherboard.
    http://img193.imageshack.us/i/94960020.jpg/
    http://img9.imageshack.us/i/62976321.jpg/
    Last edited by Dumbster; 02-09-2011 at 03:22 PM.

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    Plane Walker FinalplayerRyu's Avatar
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    Quote Originally Posted by Dumbster View Post
    Ermm 1333/333 and memory is almost 400 too ( u need multiply that 2 x) so its at 800 mhz so whats the problem? I hope your core voltage is not at 1.776 or even near it because its way too much and check it in bios (normal around 1.3625 v).

    I am running my cpu with these settings 24/7 and my motherboard only supports too 1333/333 , 800 mhz ddr2 etc. but doesnt mean nothing when doing OC with decen motherboard.
    http://img193.imageshack.us/i/94960020.jpg/
    http://img9.imageshack.us/i/62976321.jpg/
    Yeah... so after being taken in by my inpatiences i just tested it and my answered my main question myself. The other problem would be that it seems that ram is automatically keeping its 5:6 ratio when i overclock the cpu (most likely the unlink thing that The Troll mentioned), so i did found an option in the bios to set the clock of the ram, but it still just keeps the 5:6 ratio, overclocking the ram. About the voltage, i gonna take a look in the bios, but i doubt that its real, because the system is running about 1 year and a half^^'

    EDIT: VCore at 1.264-1.296... just some strange reading... from each program i used... but bios knows best...
    Last edited by FinalplayerRyu; 02-09-2011 at 03:50 PM.


  6. #6
    Plane Walker FinalplayerRyu's Avatar
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    K... now i am completly confused... the clock options i tried before was AUTO and 800 MHz, both were showing me in cpu z that FSB : DRAM was 5 : 6... 400 : 480. Out of curiosity i just chose 667 MHz for the RAM and suddenly it tells me 1 : 1... 400 : 400
    Last edited by FinalplayerRyu; 02-09-2011 at 03:57 PM.


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    Champion rich1051414's Avatar
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    Quote Originally Posted by FinalplayerRyu View Post
    K... now i am completly confused... the clock options i tried before was AUTO and 800 MHz, both were showing me in cpu z that FSB : DRAM was 5 : 6... 400 : 480. Out of curiosity i just chose 667 MHz for the RAM and suddenly it tells me 1 : 1... 400 : 400
    ok, how it works is the cpu and ram have multipliers. this 'multiplier' is how much the FSB gets multiplied by to determine the speed that the cpu or ram runs at. so if you want faster ram, but the same speed cpu, you up the FSB speed, then lower the multiplier of the CPU, so the CPU is still running near the speed as before, but the ram is running faster. Vise versa if you want to increase the CPU speed without increasing the ram speed(if its not rated high enough to boost the speed of it too). i hope this answers your question... 1:1 is the multiplier, at 1:1, the dram multiplier is 1, so it will run at the same speed as the FSB, at 1:2, or a multiplier of 2(2/1 would be the fractional representation), the ram will run at 800 MHz.

    So if you want your CPU to run at 2.4GHz, and your ram run at 800 MHz, you would set the FSB to 200, CPU to a multiplier of 12, and RAM to a multiplier of 4. if your CPU can't use a multiplier higher than 12, but you want to overclock to 3GHZ, but DRAM can't run higher than 800MHz, you can change the FSB to 250, Use a CPU multiplier of 12(250x12=3000 or 3GHz), then Set your DRAM multiplier of 3 and your RAM would be running at 750MHz(close to it's full speed, but not running higher than its rated)

    This is all theoretical numbers to help you understand how the FSB and multiplier works, voltages would also probably needed to be up'd to allow enough power to the overclocked parts
    Last edited by rich1051414; 02-09-2011 at 07:26 PM.

    Updated; February 13, 2011; Nova Bench 3; Microsoft Windows 7 Ultimate; AMD Phenom II X4 945 @ 3975 MHz; Graphics Card:Sapphire Vapor-X HD 5770 OC@960/1400
    Verified NovaBench Score: 1093
    Validated by CPU-Z

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    Put your ram on the lowest divider to start with whatever that is in bios. Manually set your multi to 8x (I think it is for Q8400) start Increasing your FSB incrementally by 10 at a time using Prime95/Linx to test for stability in Windows. Make sure as you increase your FSB your mem does not go over rated speed DDR800.

    Overclocking your mem won't yeild much of a performance increse so just safer to leave it at or close to stock as possible. Not to mention memory overclocking can be trickey playing with timings ect.

    Monitor your temps closely, if your on stock cooler I would not be pushing very hard.
    Last edited by C-BuZz; 02-09-2011 at 07:19 PM.
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    Telaran
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    Yea keep memory low and under that 800 mhz. My problem is that when i drop memory to 667 and OC to 3.5 ghz this Q9400 my memory is at about 900 mhz but its stable. Cant really OC anymore or need to get little bit higher memory.

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    Quote Originally Posted by Dumbster View Post
    Yea keep memory low and under that 800 mhz. My problem is that when i drop memory to 667 and OC to 3.5 ghz this Q9400 my memory is at about 900 mhz but its stable. Cant really OC anymore or need to get little bit higher memory.
    Your at the limit of your memory, either get faster memory or tone your overclock down a bit.
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    Champion rich1051414's Avatar
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    Quote Originally Posted by Dumbster View Post
    Yea keep memory low and under that 800 mhz. My problem is that when i drop memory to 667 and OC to 3.5 ghz this Q9400 my memory is at about 900 mhz but its stable. Cant really OC anymore or need to get little bit higher memory.
    i updated my first post and maybe it can help you a little, with the changing of the multipliers

    Updated; February 13, 2011; Nova Bench 3; Microsoft Windows 7 Ultimate; AMD Phenom II X4 945 @ 3975 MHz; Graphics Card:Sapphire Vapor-X HD 5770 OC@960/1400
    Verified NovaBench Score: 1093
    Validated by CPU-Z

  12. #12
    Telaran
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    Quote Originally Posted by C-BuZz View Post
    Your at the limit of your memory, either get faster memory or tone your overclock down a bit.
    No need to lower because it has been stable 1 month and i think most games dont really need more cpu power. ddr2 could be cheap but i think 3,5 ghz is easily enough or?

  13. #13
    Plane Walker FinalplayerRyu's Avatar
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    Thx all, my System runs now better... 2.66 to 3.2 GHz with an overall 1-2° temperature increase under load.


  14. #14
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    Quote Originally Posted by FinalplayerRyu View Post
    Thx all, my System runs now better... 2.66 to 3.2 GHz with an overall 1-2° temperature increase under load.
    Well done Nothing beats some free performance.
    2600K@5.3Ghz
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