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Thread: To LLC or not to LLC




  1. #1
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    Default To LLC or not to LLC

    I've been researching other web sites for information on LLC.I can't seem to find any information that convinces me to run or not to run LLC.Everybody seems to contradict one another.I got alot of good information from the other sites.Some people say they enable LLC to prevent Voltage spikes - Some disable to prevent Vspikes.Some say Enabled is hard on your CPU and Mobo and some it's not.Some have to Disable LLC to get stable - some don't.I'm more confused now - than I was before.My Vcore is at 1.36875 in BIOS and 1.344 CPU-Z.Any help on this would be much appreciated.(I GOTS TO KNOW)
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  2. #2
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    Default Re: To LLC or not to LLC

    Well i have always had it on and i have never had problems. It also allows your idle vcore to be lower because you don't have to compensate for the drop in vcore under load. I think if you are using reasonable voltages it shouldn't do any harm. But in the end it is all up to what you feel comfortable with.

    Edit: I used it on the same board with the same amount of ram and my Q9650 worked perfect.
    Last edited by jonathankru; 12-28-2009 at 08:39 PM.
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  3. #3
    kick's Avatar
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    Default Re: To LLC or not to LLC

    llc on seemed to cause problems on early 35 and 45 mbrds with voltage spikes.. things seem ok now..ive read.. I use it all the time anyway voltage would drop too low for me otherwise.
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  4. #4
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    Default Re: To LLC or not to LLC

    I use LLC in all my setups and until they all start mysteriously dying/OC degrading I will continue to use it as it helps quite a bit with an OC.

  5. #5
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    Default Re: To LLC or not to LLC

    Thanks for the input JonathanKru and KicK.I've always Enabled LLC myself.The reason I was concerned is - When family members come over they want to play video games(Crysis-GTA IV).Some times they will play 6 to 8 hrs. nonstop.I know Crysis has to be hard on my System - I've had it lockup 3 times (60 hrs. of playing time) but none recently.
    My System runs great - I just don't want to fry my CPU or Mobo.I was thinking of taking my 4.0 GHz setting in BIOS and Disabling LLC (fine tuning all voltages and settings) just for gaming.Is this a good idea or am I still in the DARK on this???Any feedback would be appreciated...
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  6. #6

    Default Re: To LLC or not to LLC

    I use it.
    There was a lot of fear mongering about it on a certain site a year or so ago.
    Its really up to the person setting up his or her cmos.
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  7. #7
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    Default Re: To LLC or not to LLC

    Quote Originally Posted by wibujo View Post
    Thanks for the input JonathanKru and KicK.I've always Enabled LLC myself.The reason I was concerned is - When family members come over they want to play video games(Crysis-GTA IV).Some times they will play 6 to 8 hrs. nonstop.I know Crysis has to be hard on my System - I've had it lockup 3 times (60 hrs. of playing time) but none recently.
    My System runs great - I just don't want to fry my CPU or Mobo.I was thinking of taking my 4.0 GHz setting in BIOS and Disabling LLC (fine tuning all voltages and settings) just for gaming.Is this a good idea or am I still in the DARK on this???Any feedback would be appreciated...
    You could do that. All you have to do is increase vcore till the load vcore is the same as what it was when you had LLC enabled. but i doubt it is the LLC causing the problem. How much vcore are you using for 4.0Ghz and what stress testing have you done?
    Last edited by jonathankru; 12-28-2009 at 08:46 PM.
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  8. #8
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    Default Re: To LLC or not to LLC

    IMO, LLC is pretty pointless until you can't get stable at the max rated CPU voltage. Using it simply to be able to use a super low voltage at a given overclock is severely misguided. The Vcore will spike to over the set BIOS vcore anyway with LLC enabled, no matter the board and BIOS. By turning on LLC you are circumventing a safety feature put in place by Intel to make sure that VCore never, ever goes above what the user sets in the BIOS. Using LLC guarantees that the VCore WILL definitely cycle above the set VCore at certain times.

    The question is, is that dangerous? IMO, if you're not using stupid amounts of voltage, no, it's fine. If you can't get stable at 1.3625V then engage LLC and start testing at around 1.34-1.35V instead.

    If Crysis is crashing then in all likelihood, your OC is not stable enough to handle it. Regardless of play time, you should not experience any form of instability on a sufficiently stable machine. Sufficient for 3D gaming, for me anyway, would be ~20+ IBT runs, 24 Hours of Prime Blend and 12 hours Large FFT.
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  9. #9
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    Default Re: To LLC or not to LLC

    JonathanKru - When I run 4.0 GHz (LLC Enabled) I set Vcore 1.25 in BIOS(CPU-Z shows 1.232) / Vtt 1.24 / MCH Core 1.24 / DRAM Voltage 2.1.I have not had a chance to tweak on these settings very much.
    Psycho101 - When I run 4.27 GHz (LLC Enabled) I set Vcore 1.36875 in BIOS (CPU-Z shows 1.344) / Vtt 1.36 / MCH Core 1.26 / DRAM Voltage 2.1.I can't get it to boot if I go any lower on Vcore.I have run Prime95 Blend (First time I got a error on test #5 after 3 hrs. RESET ran it again for 12 hrs. no errors).I've also ran OCCT many times - I had no spikes in my voltages.I ran Memtest86+ 6 hrs. no errors.I know I'm not 24/7 stable but I have a feeling I'm getting close.I did do the IBT GFlops test to verify my Vcore setting.If you think Disabling LLC would get me 24/7 stable I'm all for it.Any suggestions???Oh yeah one more question - If CPU-Z shows my Vcore to be 1.344 - Do I need to lower my Vtt to 1.34 in the BIOS?Thanks again for the HELP.
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  10. #10
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    Default Re: To LLC or not to LLC

    I think CPU VTT is very different for everyone. I had to use as high as 1.6V on my DFI board just to get my Q9650 stable @ 4.2Ghz but on the UD3P it only needed 1.28V to do the same clocks. So it is not JUST CPU specific. it is also board specific. And more is not always better. You have to try higher and lower and see what works. I used to drop my vcore(if 1.3V was stable and 1.26 wouldn't boot i would set it to 1.26 and then try see which vtt allowed me to boot all the way up to 500 FSB. Which isnt bad for a quad core.

    If what you set for vcore in the bios is different to what you see in windows(CPU-Z) dont worry. LLC trys to eliminate the difference in voltage between idle and load. Not the difference between what you set in bios and what you see in windows.

    Another thing to keep in mind. I only consider using LLC if you have a good PSU and a decent quality board which i think the UD4P is. I wouldn't use it if i was using a cheap PSU/Board. which is why i think was one of the reasons Intel created LLC.
    I might be wrong but it makes sence to me.
    Last edited by jonathankru; 12-29-2009 at 07:44 PM.
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