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Overclock (i7 950 to 4GHz) Causing high DPC Latency - Why? - Page 2

post #11 of 30
Thread Starter 
I noticed that in POST it was short of 8 GBs of RAM, so I went in to check and slots 5&6 were off.

While there do seem to be issues with OC and disappearing memory on this mobo (which I didn't research yet), I have discovered a small hair in one of the slots. I presume it could be enough to block one of the pins, and depending on voltage and circumstance, it actually may produce this sporadic (rather than constant) behaviour.
Notice how I don't have anything about dusting the RAM slots in my "have tried" list. Such a classic.

I hope that's the issue with boot loops and will report back when I get a feel of whether it is fixed now.

NB Some people had a couple of bent pins in the RAM sockets, so whoever has a similar problem might want to look at that too.
post #12 of 30
Thread Starter 
Well, looks like using any XMP profile also causes OC Failure and boot loop.

I will try now the default CPU settings and 12 SPD with manual 9-9-9-24 for memory just to see whether it can handle that at all.
post #13 of 30

Hmm. Hairy slots can be a problem. Ahem. :)

 

Sorry. I couldn't resist.

 

Anyway, I still believe that it might be best to just get better cooling and then go from there.

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post #14 of 30
Set your QPI Frequency to the lowest possible. 191 x the QPI multi will give you the frequency. In my experience the multi's are 24,22,18. There might possibly be a 16 multi but i'm not sure. I think you're going to have to use the 18 or 16 multi. 18 will harvest 3.4GHz QPI, using the 22 will put you beyond the limits, from what I heard.
     
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post #15 of 30
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Hmm. Hairy slots can be a problem. Ahem. smile.gif

Sorry. I couldn't resist.

Anyway, I still believe that it might be best to just get better cooling and then go from there.

Hah! True that.
I've ordered H100i v2 cooler, by the way. These boot loops are a bit annoying. If they persist every time I try to set anything related to memory, I will probably just go for a complete upgrade. Something like 58250k, X99-A ii and 2400 DDR4.

Quote:
Originally Posted by OCmember View Post

Set your QPI Frequency to the lowest possible. 191 x the QPI multi will give you the frequency. In my experience the multi's are 24,22,18. There might possibly be a 16 multi but i'm not sure. I think you're going to have to use the 18 or 16 multi. 18 will harvest 3.4GHz QPI, using the 22 will put you beyond the limits, from what I heard.
Do you think it can help vs DPC latency and audio drop outs or boot loops? I will check this out

---

In the mean time I have updated the BIOS and tried to OC to 3.8GHz. So far it seems not bad. Prime hit 85C maximum, which allows me to actually test it, and I did not experience any audio drop outs due to DPC latency yet. Fingers crossed, boot loops are also gone.
post #16 of 30
Quote:
Originally Posted by Shoujin View Post


Hah! True that.
I've ordered H100i v2 cooler, by the way. These boot loops are a bit annoying. If they persist every time I try to set anything related to memory, I will probably just go for a complete upgrade. Something like 58250k, X99-A ii and 2400 DDR4.
Do you think it can help vs DPC latency and audio drop outs or boot loops? I will check this out

---

In the mean time I have updated the BIOS and tried to OC to 3.8GHz. So far it seems not bad. Prime hit 85C maximum, which allows me to actually test it, and I did not experience any audio drop outs due to DPC latency yet. Fingers crossed, boot loops are also gone.

 

Yeah, it could be that the core voltage isn't high enough for 4.0 GHz.  I think getting better temps should enable you to increase the voltage high enough to get 4.0 GHz. Of course, lol, it's only 200 MHz higher than 3.8 GHz.

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post #17 of 30
Might want to give LatencyMon a try.

http://www.resplendence.com/latencymon

It can help you track down exactly what driver is causing the high latency that you are seeing.
post #18 of 30
Quote:
Originally Posted by Shoujin View Post

While you are around, can I ask you something else?

Occasionally my machine would go into a boot loop and will not even reach POST. The only way to get it out of it is to cut the power to PSU, wait for a few seconds, then turn it back on. Then, in the POST screen it would tell me that there was a failure due to overclocking or voltage and reset CMOS to safe defaults.

If this is due to an unstable OC, why does this not happen all the time, or why would there be no BSOD, but an occasional boot loop? Is there any particular setting to look into? So far I mostly saw people interested of just getting out of the loop (not a problem here); and somebody suggested that capacitors could be overly charged. The last suggestion would imply I need to lower the voltage somewhere, right?

You are overthinking the whole thing and unless you want to get into the specifics of electrical engineering I suggest you ensure that your system is stable after a minimum of 12 hours in Prime95 first as TwoCables suggests. The more agreed upon time was always 24 hours straight in the past but many would only do 12 and not have real problems. A lot of weird problems can happen when you overclock something too high. After all, we are directly changing frequencies from what they were designed for initially.

The chip most likely simply can't handle those clocks at the current frequency without more juice. 70c is already about the maximum you want to allow this generation to go. Boot loops are generally the computer telling you that your BCLK is too high with the current Vcore.
Edited by Sora1421 - 7/1/16 at 7:15pm
post #19 of 30
Quote:
Originally Posted by Sora1421 View Post


You are overthinking the whole thing and unless you want to get into the specifics of electrical engineering I suggest you ensure that your system is stable after a minimum of 12 hours in Prime95 first as TwoCables suggests. The more agreed upon time was always 24 hours straight in the past but many would only do 12 and not have real problems. A lot of weird problems can happen when you overclock something too high. After all, we are directly changing frequencies from what they were designed for initially.

The chip most likely simply can't handle those clocks at the current frequency without more juice. 70c is already about the maximum you want to allow this generation to go. Boot loops are generally the computer telling you that your BCLK is too high with the current Vcore.

 

Prime95's effectiveness as a test of your computer's stability can't be judged by the length of time it runs. This is because it's not applying a constant unchanging loads. Instead, it is doing something far superior to that: it is running through 82 different "FFTs", and you definitely want to make it through all 82 at least once if you're going to overclock this high.

 

With the latest version of Prime95, the length of time it should take to get through all 82 without changing the time per FFT would be less than 12 hours, but I don't know the exact average because I haven't tested it yet. If I were to make a guess, then it would be about 6-8 hours. You'd have to watch for the first bunch of FFTs to show up again to know when you can stop the test.

 

As far as the temperature is concerned, it's safe to exceed 70°C. I think the Tj. Max is 90°C to 95°C, and that's when the CPU would throttle itself down to reduce the heat - as a first line of defense. Failing that, the CPU could eventually just turn off to protect itself.

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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
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Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
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It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
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Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
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X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #20 of 30
A few things...

1) The H100i V2 should help.

2) In my very limited ocing experience, it is to my understanding that you let the motherboard define the memory speed and timing (ie don't enable xmp). Once you get a stable set up with the processor side of things (whenever overclocking), you can then focus of the memory and manually set the timings and voltage to something that will work with the new BCLK and frequency of the CPU. Most of the time, this will NOT be the xmp profile settings.

3) Isn't there a better program to test overclocking stability besides prime95? Or maybe prime95 is still best for that platform? IDK, something worth checking out perhaps...

4) Make sure you have enough airflow going across the north and south bridge heatsinks on the motherboard as well. Those get hot when overclocking!
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