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Specific bclk issue auto changing

post #1 of 9
Thread Starter 
I have a gigabyte z77x-ud5h f14 bios. i have tried to flash bios, reset cmos, and another CPU to no avail. My issue just all of a sudden materialized out of no wheres. See when overclocking the 2500k or sandy bridge my understanding is its best to set bclk to 100.00. That is all fine and dandy when i set it and save and reboot, however it manually on its own changes. it will not stay at 100.00. if i set 100, and reboot and go back into bios it jumps to 100.10. which in return makes my CPU uneven say 42 x 100 is 4200 well 42 times 100.10 is not 4200 its close but its more like 4204 or 4201 give or take. Even more concerning, after i realized this and loaded windows it jumps even higher . No matter what i set the base clock 100.01 100.03 100.26 it jumps even higher in windows under easy tune, and no its not auto loading profiles. when i look at it its like 100.32 if its set to 100.10 in bios. i am clueless to why this would all of sudden to this, it used to always stick around 100.00. My overclocks would be pretty even. Anyway is this normal to have a bclk be like 100.10 or what not. and if any of you have tried overclocking what is your general results under cpu-z. i never get a even number i have tried and tested at 42 with no errors prime 10 hours. but my CPU is at like 4201. xxxx . Is this normal for this be like that?
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post #2 of 9
Those minor variations are normal. You have nothing to worry about. If it jumps a full MHz or more, something might be up, but what you're seeing is fine and happens on pretty much all chips.
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post #3 of 9
Thread Starter 
Wow you actually responded to me, Im impressed, and gratefully appreciate the advice, i was on the phone with gigabyte, and they suggest to set bclk to auto but i have it set to 100, and was stable for 12 hours straight prime 95, so im not to worried. I have one more question for you, just to be sure , when i ran prime 95, and I know i disabled all power saving features and also set power option to high in windows, when i woke up the next morning my screen had went black maybe to sleep, anyway my question is this, since the power saving features were turned off in bios did my CPU down clock while sleeping and when awake saw prime 95 still running no errors, does this mean where im safe where im at. I also was concerned about my voltage offset. Seems really crazy what i have it set to. In my motherboard it offers only 3 options for changing voltage. Auto which is a nightmare for setting voltages. manual by typing in a number, If i do this my voltage will not down clock when power saving features are enabled. Lastly a setting called normal which then unlocks the offset voltage section of bios. I can then enter in offset voltages, I have had to set mine as high as negative -0.110. This seems high to other forums i have looked at , and at that level my voltage is still around 1.28 , 1.3 on load. Does this sound like a normal process to what my settings are at, or have i done something terrible wrong.
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post #4 of 9
If Prime95 was running, your CPU wouldn't have downclocked while you were asleep even if you hadn't disabled power saving options. Those only kick in when your system is idle, and since P95 keeps your CPU busy all the time it'll be running at its top speed constantly while P95 is running.
Regarding the monitor, it may have gone into sleep mode but that doesn't mean any of the hardware in your pc did. Now if it didn't power on when you moved the mouse or hit a button on your keyboard something's up, but if it powered on fine all is well. I think that unless you specify it to never go into sleep mode, it'll go into standby after an hour or so by default.

As for the voltage, check your LLC (load line calibration) settings. 1.28 with an offset of -0.11 is quite high, and normally your load voltage should be lower than 1.28 due to vdroop, not higher. Since is it higher on your system, I think you have some fairly intense LLC action going on meaning your voltage will be boosted quite a bit. I'm unfamiliar with Gigabyte boards so unfortunately I can't tell you exactly where to look, but have a look in your BIOS and find LLC, then turn it off. Make sure you use a smaller offset when you do this, maybe even keep it as close to stock as possible for the time being (so +/- 0.005mV) and increase it if you experience instability. The reason for this is that if it is LLC that's keeping your voltage so high, disabling it with such a high negative offset will result in a very low vcore, likely too low to be stable.
Edited by Vonnis - 3/1/13 at 11:36am
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post #5 of 9
Thread Starter 
Thanks for your help i know overclocking is a science and their really isn't a direct answer always , but tell me if at least this makes sense to you. After thought of what you had shared with me, I decided to tinker around some more in the bios, I set llc to medium power, and a negative offset of -.030 only thirty this time. and my voltage is right around 1.28 Intel burn made it around 1.29ish. However my temps are now much lower like in the 40s on load with a closed loop system cooler master seidon. Any way does this sound abount average or normal to you in terms of my settings.
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post #6 of 9
I'd personally disable LLC altogether, or if there's a setting below medium give that a try. I want load voltage to be as close as possible to idle (with EIST disabled), but never higher.
As for the temperatures, I can't really comment as I'm not familiar with that cooler, but 40s under load sounds excellent. Seems odd that your temperatures are lower when vcore is effectively the same, but lower temps are never something to complain about. tongue.gif
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post #7 of 9
Thread Starter 
Ok so I have had quit a bit of time to play with my settings.My LLC is set to standard on my board and that means no intenes load line. Back to the offset question. I still after disabling LLC or using standard voltage with no offset, its almost 1.4. I believe its 1.375 or something like this. That is way to high for a 42x multiplier on water. So generally I would start with off set using negative. Why does my chip require so much negative offset to get to a lower voltage. I have to use like a high negative value just to get to 1.25. At 1.25 i ran priem and was stable with like a -25 offset. My understanding is this affects idle and load. This just compared to what I have read and see insane. I'm not understanding why my voltage is so freaking high on a 2500k on water. Basically at a 42x multiplier it think i need a ridiculous amount of voltage is i set to auto. Anyway this seems abnormal to compare results with others. Most end up having to increase offset not take away. I want and have tested 4.2 at 1.25 stable 8 hours prime. how can i do this while achieving power saving, or what you would call green overclocking? What I have done is set LLC to standard voltage to normal which unlock offset options. Loaded into windows and looked at load was ridiculously high on voltage. So at this point kept subtracting offset until I loaded into windows and got the vcore i wanted at load witch is around 1.25 -1.28. I did run prime95 stable all night. and don't seem to have lockups at idle, pc does wake up from sleep. I do not understand though why I need such a huge negative offset to get to what should be a normal voltage.
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post #8 of 9
my gigabyte board performs the same way...I leave it on AUTO and see 100.0-100.3 fluctuations...I think thats just how it is with these boards. its definately not abnormal, your board is working fine
post #9 of 9
Thread Starter 
Yeah I normally usually just see 100mhz for bclk , but seeing that was different. I am @ 4.2 now with great temps, I will try for 4.5 later, but for now i'm happy with 4.2. I couldn't figure out the why so much negative offset voltage was needed until I stopped using LLC.
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