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Guide to Overclocking the Core I7 920 or 930 to 4.0ghz - Page 143

post #1421 of 1477
but the first post says to set Vdimm to 1.65?

Uploaded pictures of my BIOS settings, i may have done something wrong, since the names where not exactly the same in my BIOS: Warning: Spoiler! (Click to show)




----


Stange thing, when im now running prime95 this is my temps:

have been running for 45min and i havnt changed anything since last time i ran the test
Got bluescreen when running Prime95 over night so went down to 4.095Ghz
Edited by Mattriz - 3/11/14 at 4:24am
post #1422 of 1477
920 d0 @ 3.45ghz
blck 165
vcore 1.25
ratio 21
ram 1666(1654?)


everything else auto
i want to try to get my temps down, this is load with prime.
is there a way to clock it more efficiently? so that it doesn't run so hot.
my heatsink is a coolermaster V8 original, which isnt the greatest. im looking at going to water, but i want to see what i can get on air first.



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post #1423 of 1477
You run your Vdimm at that rate so that you can find your "Max O/C" lower everythign to my settings
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post #1424 of 1477
Load Calibration = 2

Vdimm lower to about 1.335 see how you test. going to 1.65 is dangerously high
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post #1425 of 1477
Quote:
Originally Posted by Mattriz View Post

but the first post says to set Vdimm to 1.65?

Uploaded pictures of my BIOS settings, i may have done something wrong, since the names where not exactly the same in my BIOS: Warning: Spoiler! (Click to show)




----


Stange thing, when im now running prime95 this is my temps:

have been running for 45min and i havnt changed anything since last time i ran the test
Got bluescreen when running Prime95 over night so went down to 4.095Ghz

Hey I really want to help you... I really really do, but you need to also help yourself. The guide above is really clear you have gotten to 4ghz.

If you read the guide it tells you what to do if your getting a blue screen, it lets you know the errors, and if you get a certain error what to do. Changing "Load Line Calibration" is only one part of the solution.
In your photo:

It clearly says "Load Line Calibration" Did you read your bios / read what I had in my board settings? Really lost since everything is listed there.

I am not in your room to overclock for you, and the beauty of it, is learning how to do it on your own. Create a log, and moving from there. Then when you are COMPLETELY lost, of course we are here to help you all the same.thumb.gif

I have never overclocked with the Asus, you may have better luck checking their boards or threads. I have only done the x58 with the Gigabyte board. BUt as the thread says:
Warning: Spoiler! (Click to show)

Initial steps:

If you've played around with any settings before reset your bios to its stock options. There's probably no need to reset your CMOS, but it can't hurt; if you don't know how to reset your cmos then I suggest you learn to do so. It's unlikely that you will have to as most modern motherboards will usually have some sort of protection against bad overclocks and automatically allow you to reset the bios upon a bad boot.

Once your bios is at its stock configuration disable EIST, turbo mode, C1, and any other power saving options that may interfere with an overclock as well as any spread spectrum settings. Now, boot into windows (If you want to use the 21x multiplier then go right ahead and set it as long as you can do so without enabling eist). Open up cpuz, load up prime and see where the voltage goes. This is your approximate vid for stock. The chip may very well run under this voltage, but this is the vid that the bios is seeing.

From here we have a number of different methods we can try. I always change my bclk in my bios settings so that anything set to auto will adjust itself if need be, although you are free to use whatever windows based tools you want although beware of any problems they may cause you.

You should always set your memory to 8x or 6x depending on what you have and your uncore to 2x the memory. Leave the qpi at the lowest setting.

Set windows not to restart on a bsod (You want to know what the error was):

Windows XP and Vista Directions (Someone please confirm this is similar to the directions for Windows 7)



Finally make sure that any gpu overclocks are disabled.

Method #1: Optimizing for max performance per watt.

This method takes by far the most amount of time but for many its worth it in terms of its power efficiency.

Begin by going into the bios and changing your voltage to your vid and setting qpi/uncore (vtt) to 1.25 (I have raised this due to concerns about droop at 1.2) and vdimm to 1.65 (Most boards can't do this 1.66 is safe, ignore your spaz bios warnings; you are not going to explode anything, although if you do, it's not my fault. Set it to 1.64 if it helps you sleep easier. I recommend at this point to be working with either the 21x multiplier if possible in order to keep your ram as much out of the equation as possible. 20X has known problems and 19x will land you with high ram speeds quicker which will require raises in the qpi/uncore voltage sooner.

Open up real temp and run prime 95 with 8 threads and check stability for an hour at least (The more the better. I recommend overnight just to make sure all is good). Record your settings on a piece of paper or email them to yourself. Make sure to have realtemp open in order to watch your temperatures. Temperatures should not exceed 80-85 during prime. During normal use for extended periods, they should never see these kinds of temperatures. I like to keep mine below 70 for normal usage.

After its stable go into the bios and increase the bclk by 10 and repeat the process. Find the max bclk for your stock vid (or any voltage, if you'd like by lowering by smaller amounts when you find an unstable clock. This will help you know what you can run at any given voltage.

See below for known prime 95 errors and how they relate to your settings (also some settings to try for stability). Once you get to the clocks you want, I recommend running prime for at least 16-24 hours. I have in fact had errors in the 14th hour so it's good to know that you're truly stable.

See also below for optimizing your ram settings.

Method #2: Quick and dirty method for 4ghz aka screw efficiency

Set your ioh and ich to 1.2, your vdimm to 1.65, your cpu pll to 1.88, and your qpi/uncore to 1.35.
For D0 users set your vcore to 1.275 and for c0/c1 users set your vcore to 1.4 Bclk to 190/191 or 210/211 and multiplier to 21 and 19 respectively. Check for prime stability. D0s should be fine, but c0/c1 still may not make it, at this point your temps may be too high if you're not on water so I suggest you start working backward in order to hit a much lower vcore or use method 3.

Method #3: Quick and dirty vcore boosting.

Set your ioh and ich to 1.2, your vdimm to 1.65, your cpu pll to 1.88, and your qpi/uncore to 1.35. Set Bclk to 190/191 or 210/211 and multiplier to 21 and 19 respectively.

The d0 chip usually hits 4.0 in the vcore range of 1.175 and 1.25 try those voltages until you find whats right for your chip.

The c0/c1 is a much more difficult beast with a much larger range of 1.27 to around 1.4 and up to 1.5 (Do not attempt on air unless you live somewhere really, really cold). Some may not hit 4ghz at all.

This method is more difficult as some chips may not boot until you give them the proper vcore

How to use prime95 to test stability:

Open up prime95 and realtemp to check that your idles and loads. Set prime95 to whatever priority you'd like. I prefer 7 so that realtemp still updates but some people prefer 10 and will run without a temperature monitor. Either is fine, but I'm always paranoid that my cooler will somehow become unlatched spontaneously. Set windows not to restart on bluescreen by setting[insert settinsg here] so that you can catch the error (although windows will record it somewhere). Start a mixed torture test and let it run for however long, depending on if you're only doing a temporary stability test in order to raise (about 1 hour) or a true stability test (16-24 hours). Once you've passed prime95 you can run any other stability test that you want.

Prime 95 Errors:

Freeze: Increase the vcore

Other errors can indicate instability with the chip if they are during small fft (increase vcore by .125) or instability with ram large ftt (Try raising the ioh and/or running memtest).

BSOD code 101: Increase the vcore. I recommend increasing by +.025 if you get a bsod

BSOD code 124: Increasese or decrease the qpi/uncore by .25. Depending on where you are in your stability tests you'll probably need to increase it. 1.375 is the max I'm comfortable with although people say 1.4+ is safe. This is for you to determine and research. Don't do anything you're not comfortable with. Intel says do not go above 1.35 so 1.375 with droop and loss is safe and not too outside specification.

It is important to note that sometimes qpi can be too high and that might cause this code. That's why it's not a good idea to just set things to 1.35 and hope for the best. If you find that increasing qpi/uncore voltage is not increasing stability, try decreasing it. Just remember of course, to keep track of your settings. I recommend not increasing, unless you have to (Don't be arbitrary about it).

D0 exclusive BSOD weird 2 letter/number codes: Treat this as a 101 and increase vcore by +.025. Update: It seems that these error codes can crop up for other reasons. Depending on where you are in the process you should take a look at your other voltages. I realize this is vague, but you may need to experiment.

If any worker fails, especially during small fft then it's cpu voltage. Bump it once or twice. If it fails during large fft then its probably memory error you can try running memtest/upping ioh. I would try running small fft at that point for a good amount of time and make sure its not the cpu voltage. If it passes 8-12 hours of small fft then work on making it pass large fft. Just remember to keep track of your settings. That's not to say that a large fft error won't be the result of cpu voltage, it's just not what I would try. Be methodical. If something allows prime to run significantly longer then keep it. Significant depends where you are in the process. If your workers fail as soon as you start and a setting change gets you through a test then I'd say its good. If you get crashes during the 8th hour, and the setting change only gets you another 5 minutes in the 8th hour, it's probably just random and not the setting.

Using Linx:
While linx can be used for a stability test I do not recommend it, because it's not always clear as to what the cause of the error is. A lot of people don't feel their cpu to be stable until they've done X passes of full mem in linx. Linx will raise your temperatures way beyond what you will see in any real setting and raise it even higher than prime. Thus, not everyone will be in a position to even use linx. Prime stable is stable enough for me, but it's up to you to decide. Linx will show you how hot your processor could possibly get.

Testing Memory Stability with memtest 86+:

Personally, I do not run memtest until I actually encounter what could be memory errors( I assume things work until proven otherwise) Begin by setting your ram timings in the bios and setting your qpi/uncore to 1.35 and your vdimm to 1.64-1.66. Do not oc your cpu. Just run your ram at its rated spec to make sure that the ram is stable and not defective. You can also check it again with an oc'ed cpu as well. If it's unstable try raising the ioh to 1.20 or higher. If you are still getting errors try each dimm one at a time and see if you need to RMA (A pain in the ass but necessary).

Optimizing ram with memtest86+:

Assuming your ram is stable you can either overclock, lower voltage, tighten timings, or all of the above.

1.Lowering voltage. Run memtest86 for 20 minutes, if you get errors, stay where you are. Otherwise lower the vdimm by .02 and repeat until you get an error within 20 minutes. Then run it overnight.

2.Overclocking. You may be able to run your ram faster than you thought. Loosen the timings(make them higher) and then increase bclk. You can optimize your voltage with the above number one. Depending on the ram, you may be able to overclock quite a bit or not at all. Running your ram at anything above 1066 is in fact overclocking the imc.

3. Tighteening timings. Timings should be decreased as such Assuming you begin with 9-9-9 your next step should be 9-9-8 then 9-8-8 then 8-8-8. You can also try 8-9-8 but this is going to depend on your memory. You may need to raise voltages to tighten the timings.

The usefulness of overclocking your ram is limited see the useful links sections below to see how certtain ram settings will impact your real life performance.

Frequently asked questions:

Q: I can't raise my bclk over some number. How do I fix it? What's the deal?

A: Not all chips and motherboards are made the same. You can try playing around with voltage amplitude, pll, skew or pcie (pcie is probably best not raised as it can cause damage). This is a question that is better asked on a thread dedicated to a specific board. You may end up being out of luck.

Q: What are safe voltages?
A: According to intel or common knowledge the following are the safe air temperatures:

Vcore: ~1.4
qpi/uncore (VTT): 1.35
PLL: 1.88
Vdimm:~1.65 (Some will say that you are safe within .5 of your qpi/uncore allowing for a max of 1.85 on vdimm. See the link to the xtreme systems forum below on this subject for a long thread).
IOH: Less than 1.3
ICH: Less than 1.3

Q: My chip is too hot before I can reach 4 ghz. What can I do?

A: Disable hyperthreading or buy a better cooler (TRUE or megahalems recommended).

Q: But don't I want hyperthreading?

A: It's certainly nice to have a feature you paid for, but it sometimes decreases performance and it definitely causes a lot of heat. It's up to you. See this link for results of enabling hyperthreading in real life situations.

Q: How do I go past 4ghz?

A: Same way as you got there in the first place. Just keep increasing bclk. Past this point though it's up to you to do some research on your own.

Q: What is this multiplier throttling I've heard about?

A: Some boards will throttle down the 21x multiplier if the wattage becomes too high. The culprits without public fixes are the Asus p6t deluxe and vanilla (The deluxe v1 has a bios available on the xtremesystems forum which can be crossflashed onto the v2 which will fix this problem) It really only becomes a problem at high voltages with high frequencies. Other boards have ways of disabling it.

Q: Why would I want to optimize my voltages?
A: Save money on power bills and leave more wattage for other devices.

Q: My chip was stable for X amount of time and now it's not?
A: Have you added any hardware? How are your temperatures? High voltages and high temps can cause decay and make the chip require more voltage for an overclock. It may also be that your psu is starting to go or maybe your motherboard is. Do your best to troubleshoot this.

Q: My temperatures seem really high? Is X degrees ok?
A: A better question is whether or not you are ok with X degrees. How long do you plan to won this chip? What are your ambients? If your house is 40 degrees centigrade, don't expect your chip to drop below that unless you are using extreme cooling (also try to move somewhere cooler cause that's really hot or get some AC, are you trying to cook yourself?). A cpu well taken care of can last over a decade when run within spec. How long do you really think you're going to keep this chip? A rule of thumb I go by is never push a part that I can't afford to replace if I break it (I do this anyway, but its a good rule nonetheless). Your temps will always get higher than normal when stress testing so do some normal stuff to see if your temperatures are acceptable. Try backing down a bit if you are unhappy.

Q: I heard this will work or this needs to be this way?
A: Try it. This is a general guide, not a set of hard and fast rules.

Q: My computer restarted while priming; how do I find out the error?
A: If you haven't already, disable bsod restarts in windows. Sometimes, though, it decides to restart anyway.

In XP You want to find a program called Event Viewer. Directions from MS:
Quote:
# Click Start, and then click Control Panel. Click Performance and Maintenance, then click Administrative Tools, and then double-click Computer Management. Or, open the MMC containing the Event Viewer snap-in.
The errors should be under system.

In Vista from Petri:
Quote:
Open Computer Management by right-clicking the Computer icon on the start menu (or on the Desktop if you have it enabled) and select Manage. Navigate to the Event Viewer. Note: If you did not disable UAC (read my "Disable User Account Control in Windows Vista" article) then you will be prompted to consent to the action you're about to perform. Click Continue. Note: You can also open the Event Viewer by typing Event Viewer in the Search box and pressing Enter, or typing eventvwr.msc in the Run command.
You also want to look at the system log.

Also check the results.txt in your prime95 folder for a log of when it ultimately crashed and what it was doing at the time.

Q: Whats the deal with PCIE frequency? Can it help break my bclk wall?

A: Yes, but I advise caution. Raising this too much can damage things running on the pcie bus or cause them to not work. I would not raise it personally more than a few mhz. You are probably safe at 103, but I take no responsibility of course.

Q: Is there a list of BSODs and what I should do?

A: Thanks to Hammer=GOM= there is. He also provided a helpful link to software which will help you see what error code was displayed:
BSOD viewer:
http://www.nirsoft.net/utils/blue_screen_view.html
BSOD codes:
BSOD codes for overclocking
0x101 = increase vcore
0x124 = increase/decrease vcore or QPI/VTT...have to test to see which one it is
0x0A = unstable RAM/IMC, increase QPI first, if that doesn't work increase vcore
0x1E = increase vcore
0x3B = increase vcore
0x3D = increase vcore
0xD1 = QPI/VTT, increase/decrease as necessary
0x9C = QPI/VTT most likely, but increasing vcore has helped in some instances
0x50 = RAM timings/Frequency or uncore multi unstable, increase RAM voltage or adjust QPI/VTT, or lower uncore if you're higher than 2x
0x109 = Not enough or too Much memory voltage
0x116 = Low IOH (NB) voltage, GPU issue (most common when running multi-GPU/overclocking GPU)

Q: Can I PM you with questions about my system/configuration?

A: I'd rather you didn't. You will get a much quicker answer from me or somebody else if you post here or in your own thread. If you have a question chances are someone else will benefit from reading the answer. I will respond, but it puts more pressure on me to respond quicker when I may not have time.

Voltages/settings you can try to use to increase stability:

PLL: 1.88
IOH: 1.2+
ICH: 1.2
CPU voltage amplitude: +800mv
CPU Skew: +300ps
Command rate: change from 1n to 2n

Edited by dpoverlord - 3/16/14 at 12:35pm
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post #1426 of 1477
Quote:
Originally Posted by dpoverlord View Post

You run your Vdimm at that rate so that you can find your "Max O/C" lower everythign to my settings

Quote:
Originally Posted by dpoverlord View Post

Load Calibration = 2

Vdimm lower to about 1.335 see how you test. going to 1.65 is dangerously high

dpoverlord, you're forgetting that a lot of ram is rated to run at 1.65 to get full speed. It is a completely safe voltage. So stop telling him to lower it just because your system was stable at 1.335. Or are you perhaps mixing it up with QPI/vtt? If that's the case it would be ridiculously high, since Bloomfield chips max out at 1.45 safely.

@Mattriz leave you vdimm at 1.65v. Turn on LLC. Keep in mind this will increase your temps, but it may make you more stable. Blue screens and errors in P95 will give you hints as to what crashed so you know which voltages to adjust. This list may help.
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post #1427 of 1477
Hahaha referring to vcore /Qpi not vdimm as in memory no wonder. Wish he posted the lines.
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post #1428 of 1477
Thank you guys!
post #1429 of 1477
Quote:
Originally Posted by dpoverlord View Post

Load Calibration = 2

Vdimm lower to about 1.335 see how you test. going to 1.65 is dangerously high

What? lachen.gif 1.65v is perfectly normal for DDR3. I've ran 1.7-1.75v through mine on my X58 rig with no problems
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post #1430 of 1477
hey, give him a break. He have helped me alot
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