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post #21 of 38
Thread Starter 
ok i got some results:
3.8 Ghz
CPU MULT - 20x
BCLK - 190
mem mult - 6.0
memory settings - 9-9-9-25 1t
Vcore - 1.300v
QPI/Vtt - 1.355v
1 hour on prime works without errors but temp, i think not good enough, at max 82c. Tried decreasing Vcore but even on 1,275v it failes in prime after half an hour but temps were 77c.
I read in a gude that 21x and 19x mult. better than 20x, any truth?
post #22 of 38
Quote:
Originally Posted by lokigarson View Post

ok i got some results:
3.8 Ghz
CPU MULT - 20x
BCLK - 190
mem mult - 6.0
memory settings - 9-9-9-25 1t
Vcore - 1.300v
QPI/Vtt - 1.355v
1 hour on prime works without errors but temp, i think not good enough, at max 82c. Tried decreasing Vcore but even on 1,275v it failes in prime after half an hour but temps were 77c.
I read in a gude that 21x and 19x mult. better than 20x, any truth?

My 920 is impossible to get stable with 20x and I don't think it's a unique case. Worth the try.
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post #23 of 38
Glad you made some progress. Since I have a 930, I use 21x multiplier, but if I remember correctly, for a 920, it's best to use an odd multiplier = 19.

Rather than lowering your vcore, try lowering your qpi/vtt voltage. QPI/VTT = 1.355v seems a little high to me, though maybe things are different for an 920. Anyway, I suggest the following: Leave vcore at 1.300v, and try qpi/vtt voltage = 1.3375v. If you can boot, run a short 15-20min (at most 30min) stress test. If those settings pass, then try qpi/vtt = 1.3250v (again do not change vcore). If you can boot, run another 15-20 min. stress test. If that passes then lower qpi/vtt voltage to 1.3125v & repeat the process. Keep going (lower qpi/vtt voltage by 0.0125 increments and run a short 15-20 min stress test) until either you fail a short stress test or just can't boot. Now, go back to previous qpi/vtt voltage setting (last one that passed short stress test) and run a long stress test. How long is up to you. For some a couple of hours is good enough. For others, 24 hours. Hopefully that will work, but if not, increase qpi/vtt voltage by 0.0125 and try a long stress test again. That should pass.

It's a lot of work, but this way you help minimize heat and loss of CPU life. Once you determine the lowest working qpi/vtt voltage, then see if you can still get 3.8GHz stable with a lower vcore voltage. Try vcore = 1.2825v rather than 1.275v. VCore = 1.300v may be the lowest you can go and still get 3.8GHz stable. Still, 3.8GHz stable for a 920 with vcore = 1.300v and qpi/vtt = 1.300v or less seems to me like a pretty good 920 OC Temps should be better with the lower qpi/vtt voltage as well

Last Item: I see you're using a Scythe Mugen 3 heatsink. If you only have one fan, you might want to try getting another for a "push-pull" configuration. That should help reduce temps by a couple degrees C or so. Also, some fans are better than others in terms of static pressure (high static pressure = good for heatsinks). You might want to do some research on fans and see if there are better ones than what you're using now. Lastly, if you did not use a top-notch thermal paste before, removing the heatsink and reinstalling with a top performing brand could also reduce temps by a couple of degrees C.

GL & keep us updated.
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post #24 of 38
Thread Starter 
Quote:
Originally Posted by goesto11 
Rather than lowering your vcore, try lowering your qpi/vtt voltage.
i tried this stuff and found out that min. vcore and qpi for even loading windows are the same - 1.275v but it BSODs in half-hour in prime. And then i was decreasing QPI from 1.355 to 1.275 with 1 step at a time and temp did not change it was same 77c at all steps(i was checking only temps not stability in prime during this qpi decrement and vcore at that time was 1.275v)
Quote:
Originally Posted by goesto11 
If you only have one fan, you might want to try getting another for a "push-pull" configuration.
i have this case so additionaly a have 4 other system fans - 3 x 230mm fans, 1 x 140mm rear fan.

Theoretically, if i decrease BCLK(181) and increase CPU mult.(21) will it affect temperature somehow?
post #25 of 38
Quote:
Originally Posted by lokigarson View Post

i tried this stuff and found out that min. vcore and qpi for even loading windows are the same - 1.275v but it BSODs in half-hour in prime. And then i was decreasing QPI from 1.355 to 1.275 with 1 step at a time and temp did not change it was same 77c at all steps(i was checking only temps not stability in prime during this qpi decrement and vcore at that time was 1.275v)
i have this case so additionaly a have 4 other system fans - 3 x 230mm fans, 1 x 140mm rear fan.

Theoretically, if i decrease BCLK(181) and increase CPU mult.(21) will it affect temperature somehow?
The lower the vcore/vtt the better

I think your temperature will remain the same. You might be able to lower vcore though. Maybe!

push/pull is this. It might take off 1 or 2 c depending on the fans you put on there.
post #26 of 38
lokigarson:

A lower BLK requires less voltage (both VCORE & QPI and less voltage = lower temps. A 21 multiplier allows you to reach 3.8Ghz with a lower BLK. So yes, in theory, a 21 multiplier should = lower temps. Of course it still varies between individual CPUs. Some CPUs just OC better/easier than others as you know. That being said, from what I recall from reading 920/930 OC forum threads, the general consensus was to use a 19, rather than 20, multiplier as odd multipliers tend to work better for those chips (reason I use 21, not 22). I don't recall anyone with an i7 920 being able to use a 21 multiplier. Maybe it's possible, but not AFAIK. If you want to try and somehow "unlock" your CPU and use a 21 multiplier, then your choice. Just make sure you are not risking damage to your CPU in the process. How do do that is beyond my knowledge.

RE TEMPS: Did your room temperature go up at all during testing? I can tell you for CERTAIN that matters. For me a 2F change in room temp = 1C change in CPU max temp under full load. What temp monitoring software are you using? I've used RealTemp for years & like it a lot. FYI in case you don't use it already. Sorry if these questions seem odd, but I'm honestly surprised that after lowering both VCORE AND QPI voltages to 1.275v (especially VCORE), you saw NO change in max temp under load. Not even 1C. I would have expected you to see at least a 1C if not 2C drop in temps. If I lower/raise just my VCORE by 0.025v, I'd definitely see some change in temps (1-2C at constant room temp). I didn't expect a huge difference with a lower QPI, but I did think going to 1.300v or lower would reduce temps even if just a little. All I can say is to see no change at all after dropping both voltages like that is kind of odd without a change in room temp IMO.

At this point I think it makes sense to focus on getting a stable 3.8Ghz OC with the lowest possible VCORE & QPI voltages. JMO, but as long as you stay under 80C during stress testing, you should be fine. After that, you can work on lowering temps mentioned below.

*Just to make sure I understand you correctly:
(1) You first tried lowering VCORE, not QPI. Leaving QPI = 1.355v, you could boot at 3.8GHz with 1.275v VCORE, but failed stress test.
(2) Next, leaving VCORE = 1.275v, you then lowered QPI from 1.355v in as small of steps as possible all the way to QPI = 1.275v = lowest QPI voltage (with VCORE = 1.275v) and still boot. Given #1 none of the settings would allow you to pass a stress test.
(3) You did NOT test lowering QPI with VCORE = 1.300v.
(4) From earlier, with VCORE = 1.300v and QPI = 1.335v, you CAN get a STABLE 3.8GHz OC. Am I correct for all of these?

Assuming #3 & #4 are correct (especially #4 = STABLE OC with 1.300v VCORE), I suggest the following in order:
  • (1) Set VCORE = 1.300v, and do NOT change/lower it. Now try to find the lowest possible working QPI voltage per method before. You could try starting at QPI = 1.325v and go down from there using 0.0125v steps (NOT 0.025v). IF QPI = 1.325v fails stress test, then go back to 1.355v (which did give you a stable OC) and work your way down from there. My prior post may have been a bit difficult to read, but that was my suggestion -> work on QPI FIRST, then see about using less than 1.3000v VCORE.
  • (2) NEXT, keep QPI at that "lowest voltage for stable OC" per above, now try to see if you can use less than 1.300v VCORE and still get a stable 3.8Ghz OC. Given what you posted, my guess is that 1.300v is most likely the best you can do, but certainly no reason not to try 1.2875v.
  • (3) You should now have the lowest possible voltage settings for both QPI & VCORE for a stable 3.8GHz OC. If not done so already, give those settings a fairly long stress test to ensure stability. I'd say at least 4 hours/ 6 preferable. Again, don't worry about temps unless you go over 80c. Even that limit has some margin of safety.

Other things to do for temp:
Sounds like you have a good case with lots of airflow. Even so, using a push pull fan configuration for your heatsink IMO should (you never know) help to lower temps about 2C. It's not much, but it's not that expensive to add another decent fan either. Same goes for the "better" thermal paste and/or "better" application (i.e. putting just enough rather than too much - something I have a tendency to do tongue.gif). May shave off a 1-2C, may not. The reason I mention these is that there comes a point to where you can't do any better in terms of temps from simply changing you OC settings. It may not be possible with a stable 3.8GHz OC for you get lower than 77C max temp during stress tests via bios settings alone. At that point, you have to look to "external" methods if temps are still higher than you like.
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post #27 of 38
Thread Starter 
Quote:
Originally Posted by Carlitos714 
push/pull is this. It might take off 1 or 2 c depending on the fans you put on there.
thanks, so basically i can add one more fan to my scythe mugen 3?
Quote:
Originally Posted by goesto11 
I don't recall anyone with an i7 920 being able to use a 21 multiplier. Maybe it's possible, but not AFAIK. If you want to try and somehow "unlock" your CPU and use a 21 multiplier, then your choice.
for my motherboard/BIOS it's not a big problem, in BIOS i have something like "intel turbo mode" that gives access to 21x multiplier.
Quote:
Originally Posted by goesto11 
Did your room temperature go up at all during testing?
nope, it was stable - 26c.
Quote:
Originally Posted by goesto11 
What temp monitoring software are you using?
RealTemp 3.70
Quote:
Originally Posted by goesto11 
(1) You first tried lowering VCORE, not QPI. Leaving QPI = 1.355v, you could boot at 3.8GHz with 1.275v VCORE, but failed stress test.
not really, i wanted to know where the boundary of not loading windows at all and it was 1.25v so 1.275v last step for loading win, and yes i left qpi=1.355v
Quote:
Originally Posted by goesto11 
(2) Next, leaving VCORE = 1.275v, you then lowered QPI from 1.355v in as small of steps as possible all the way to QPI = 1.275v = lowest QPI voltage (with VCORE = 1.275v) and still boot. Given #1 none of the settings would allow you to pass a stress test.
(3) You did NOT test lowering QPI with VCORE = 1.300v.
nope, i returned vcore to 1.3v and started finding the boundary of not loading windows now for QPI and it was 1.25v. So after all i tried this boundary "win load" settings in prime.
Quote:
Originally Posted by goesto11 
(4) From earlier, with VCORE = 1.300v and QPI = 1.335v, you CAN get a STABLE 3.8GHz OC. Am I correct for all of these?
yep, it's correct, but temp was high - it max 82C(3 hours prime)
Quote:
Other things to do for temp
thanks for the tips.thumb.gif

So like Vonnis said it's truly that 21x mult far more stable, because right now i have this settings:
3.8 Ghz
turbo mode
HT on
CPU MULT - 21x
BCLK - 181
mem mult - 6.0
memory settings - 9-9-9-25 1t
Vcore - 1.26875v
QPI/Vtt - 1.255v
vdimm - 1.64v
and it's stable for 3 hours in prime blend test and temp at max 75C.

Tried Vcore - 1.25v - BSODed with all these settings, didn't try decreasing QPI further, maybe it's possible.
Edited by lokigarson - 3/4/13 at 1:52pm
post #28 of 38
Quote:
Originally Posted by lokigarson View Post

thanks, so basically i can add one more fan to my scythe mugen 3?
So like Vonnis said it's truly that 21x mult far more stable, because right now i have this settings:
3.8 Ghz
turbo mode
HT on
CPU MULT - 21x
BCLK - 181
mem mult - 6.0
memory settings - 9-9-9-25 1t
Vcore - 1.26875v
QPI/Vtt - 1.255v
vdimm - 1.64v
and it's stable for 3 hours in prime blend test and temp at max 75C.

Tried Vcore - 1.25v - BSODed with all these settings, didn't try decreasing QPI further, maybe it's possible.
How many notches is it from 1.26875 vcore to 1.25? On my board there is 3
Try 1.25625 or 1.26250
See if you can lower QPI only after you find your lowest vcore. Good job man. I think we finally got you near stable!!

Yes you can do this! You might drop some degrees. If you dont have an extra fan I wouldn't bother buying a new one though
post #29 of 38
Quote:
Originally Posted by lokigarson View Post

So like Vonnis said it's truly that 21x mult far more stable, because right now i have this settings:
3.8 Ghz...
and it's stable for 3 hours in prime blend test and temp at max 75C.
Tried Vcore - 1.25v - BSODed with all these settings, didn't try decreasing QPI further, maybe it's possible.

Great! thumb.gif That's MUCH better. I didn't think you could set a i7 920 at a 21x multiplier. Did you just set it that way in the bios or was there some work around? Regardless, 21x multiplier definitely the better way to go. (Hmm... wonder if I could use 23x on my i7 930 tongue.gif ).

RE Adding a fan to the Mugan 3: if you want to do so, just make sure you have another set of fan clips on hand. Should have come with the retail package, but if not, call Scythe and see if they will send you an extra set.

Congrats again - the hard work paid off. biggrin.gif Oh, one last thing. Once you do get your "ulitmate" OC settings - I suggest you write them down and/or copy to notepad/whatever for archive on a backup HDD/USB flash drive. That way you'll have a copy in case you ever have to reset the bios. Learned that the hard way XD.
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post #30 of 38
Thread Starter 
Quote:
Originally Posted by Carlitos714 
How many notches is it from 1.26875 vcore to 1.25? On my board there is 3
Try 1.25625 or 1.26250
See if you can lower QPI only after you find your lowest vcore. Good job man. I think we finally got you near stable!!
3 notches, but i tried vcore on 1.26250v(one notch down) and it BSODed and QPI last stable -1,235v, so i think this maximum that i can get for stable 3.8Ghz, so lastly i primed it for nearly 19 hours on blend test(573tests 0 errors) though during this long test temp raised a bit - 78C at max.



And should i turn on EIST and C1E after finding stable OC?
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