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post #9291 of 10702
My updated results

Running...


Stopped...



Changes I made are as follows:

CPU PLL Voltage: from Auto to 1.6000 (as you can see, this change made little to no difference in my Vcore)

Using Prime95 27.7 64-bit (instead of Prime95 27.7 32-bit version as before)
Using 13,824 MB of RAM
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post #9292 of 10702
Quote:
Originally Posted by owcraftsman View Post

My hope is to clear up any ambiguity over Prime95 ver 27.7
You can see below the entire list of iterations offered by this version before iterations begin to repeat. If you like to see for yourself quickly simply run a custom test using the settings below.



The results below are copied from the results text from within Prime95 less the 3-4 passes per iteration that was reported. The test that follows the last iteration listed here is 448k which you will note is the first test. I suppose you will have to trust me on this or take the time to test your self.

Prime 95 ver 27.7
[Aug 2 23:35] Worker starting
  1. [Aug 2 23:37] Self-test 448K passed!
  2. [Aug 2 23:38] Self-test 8K passed!
  3. [Aug 2 23:39] Self-test 512K passed!
  4. [Aug 2 23:40] Self-test 12K passed!
  5. [Aug 2 23:41] Self-test 576K passed!
  6. [Aug 2 23:42] Self-test 18K passed!
  7. [Aug 2 23:44] Self-test 672K passed!
  8. [Aug 2 23:45] Self-test 21K passed!
  9. [Aug 2 23:46] Self-test 768K passed!
  10. [Aug 2 23:47] Self-test 25K passed!
  11. [Aug 2 23:48] Self-test 864K passed!
  12. [Aug 2 23:49] Self-test 32K passed!
  13. [Aug 2 23:51] Self-test 960K passed!
  14. [Aug 2 23:52] Self-test 36K passed!
  15. [Aug 2 23:53] Self-test 1120K passed!
  16. [Aug 2 23:54] Self-test 48K passed!
  17. [Aug 2 23:55] Self-test 1200K passed!
  18. [Aug 2 23:57] Self-test 60K passed!
  19. [Aug 2 23:58] Self-test 1344K passed!
  20. [Aug 2 23:59] Self-test 72K passed!
  21. [Aug 3 00:00] Self-test 1536K passed!
  22. [Aug 3 00:01] Self-test 84K passed!
  23. [Aug 3 00:02] Self-test 1728K passed!
  24. [Aug 3 00:03] Self-test 100K passed!
  25. [Aug 3 00:04] Self-test 1920K passed!
  26. [Aug 3 00:05] Self-test 120K passed!
  27. [Aug 3 00:07] Self-test 2240K passed!
  28. [Aug 3 00:08] Self-test 140K passed!
  29. [Aug 3 00:09] Self-test 2400K passed!
  30. [Aug 3 00:10] Self-test 160K passed!
  31. [Aug 3 00:11] Self-test 2688K passed!
  32. [Aug 3 00:12] Self-test 192K passed!
  33. [Aug 3 00:13] Self-test 2880K passed!
  34. [Aug 3 00:15] Self-test 224K passed!
  35. [Aug 3 00:16] Self-test 3200K passed!
  36. [Aug 3 00:17] Self-test 256K passed!
  37. [Aug 3 00:18] Self-test 3456K passed!
  38. [Aug 3 00:19] Self-test 288K passed!
  39. [Aug 3 00:20] Self-test 3840K passed!
  40. [Aug 3 00:21] Self-test 336K passed!
  41. [Aug 3 00:22] Self-test 400K passed!
  42. [Aug 3 00:24] Self-test 480K passed!
  43. [Aug 3 00:25] Self-test 10K passed!
  44. [Aug 3 00:26] Self-test 560K passed!
  45. [Aug 3 00:27] Self-test 16K passed!
  46. [Aug 3 00:28] Self-test 640K passed!
  47. [Aug 3 00:29] Self-test 20K passed!
  48. [Aug 3 00:30] Self-test 720K passed!
  49. [Aug 3 00:32] Self-test 24K passed!
  50. [Aug 3 00:33] Self-test 800K passed!
  51. [Aug 3 00:34] Self-test 28K passed!
  52. [Aug 3 00:35] Self-test 896K passed!
  53. [Aug 3 00:36] Self-test 35K passed!
  54. [Aug 3 00:37] Self-test 1024K passed!
  55. [Aug 3 00:38] Self-test 40K passed!
  56. [Aug 3 00:40] Self-test 1152K passed!
  57. [Aug 3 00:41] Self-test 50K passed!
  58. [Aug 3 00:42] Self-test 1280K passed!
  59. [Aug 3 00:43] Self-test 64K passed!
  60. [Aug 3 00:44] Self-test 1440K passed!
  61. [Aug 3 00:45] Self-test 80K passed!
  62. [Aug 3 00:46] Self-test 1600K passed!
  63. [Aug 3 00:47] Self-test 96K passed!
  64. [Aug 3 00:49] Self-test 1792K passed!
  65. [Aug 3 00:50] Self-test 112K passed!
  66. [Aug 3 00:51] Self-test 2048K passed!
  67. [Aug 3 00:52] Self-test 128K passed!
  68. [Aug 3 00:53] Self-test 2304K passed!
  69. [Aug 3 00:54] Self-test 144K passed!
  70. [Aug 3 00:55] Self-test 2560K passed!
  71. [Aug 3 00:57] Self-test 168K passed!
  72. [Aug 3 00:58] Self-test 2800K passed!
  73. [Aug 3 00:59] Self-test 200K passed!
  74. [Aug 3 01:00] Self-test 3072K passed!
  75. [Aug 3 01:01] Self-test 240K passed!
  76. [Aug 3 01:02] Self-test 3360K passed!
  77. [Aug 3 01:03] Self-test 280K passed!
  78. [Aug 3 01:05] Self-test 3584K passed!
  79. [Aug 3 01:06] Self-test 320K passed!
  80. [Aug 3 01:07] Self-test 4000K passed!
  81. [Aug 3 01:08] Self-test 384K passed!
  82. [Aug 3 01:09] Self-test 4096K passed!

Time to complete 1:32:00 or 92 minutes
92/82=1.12 minutes per iteration
1.12*15=16.80 estimated time to complete an iteration when 15 minutes is selected
16.80*82=1377.6 estimated minutes to complete 82 iterations using 15 minute iteration length
1377.6/60=22.96 estimated hours to complete 82 iterations or 22:58:01

Conclusion: Expect the default torture test for Prime95 ver 27.7 to take 23 hrs to complete a full round of available test before it begins to repeat test over again.

Note: The iterations (in Red above) most commonly used as a precursor to a full run of Prime, 1344, 1792 & 2688 come at 23 min, 36 min & 74 min in to the 1 min per iteration testing. That translates in to 345 min, 540 min & 1100 min if you multiply by 15 to calculate estimated time at 15min iterations. That comes to  5:45:00, 9:00:00 & 18:30:00 respectively the amount of time it would take to reach each of those test.
Same as all processor, motherboard, memory, GPU combos and system setups vary in their ability to overclock and or produce bench results so too will your time vary to complete these test but there is a range of similarity that we’ve come to know with these combos, which means if your result vary widely for those published above you may have an issue that needs to be addressed. For example if you are taking 20 min or more to complete an iteration it’s likely you bench result will be low. This has been evidenced by folks with high overclocks producing bench results under what similar systems with with a lesser clock. I could go deeper into this aspect but it would be breaking from the scope of this post so I will let you draw your own conclusion on that matter for now.

IMHO if you want to consider your machine Super Stable you would have to run a Prime Torture Test, which is essentially a blend test (8k to 4096k or small & large FFTs), using 95% of available memory for 24 hrs. Thus would insure maximum stress testing using all available test through Prime95 ver 27.7

Thanks! +REP smile.gif

Anyway, I understand now most of the post but not this one "For example if you are taking 20 min or more to complete an iteration it’s likely you bench result will be low. This has been evidenced by folks with high overclocks producing bench results under what similar systems with with a lesser clock.". Can you expound that for me? Thanks.
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post #9293 of 10702
Quote:
Originally Posted by owcraftsman View Post


People have a tendency to grab other peeps templates, attempt to use it and when they fail they have no idea why. What they miss is the process of getting to those settings because they are either to lazy or don't have time to do it on there own. Check out your beginners guides to Overclocking. When you do, you will discover they are quit simple, you make only a couple changes to your bios and are instructed on how to work your way up gradually. You will not find the finer details such as CPU Pll adjustment in these guides yet you will come to stabilize your system it may not be 5.0 but you will get somewhere. Now that your system is stabilized, meaning 12 hours Prime95, it's time to move on to the finer details. Let's say your temps were to high when you ran Prime and now you want to lower your temps and you heard somewhere lowering CPU PLL not only lowered temps but also make it possible to run the same system at the same clock speed with a slightly lower vcore too. That would sound wonderful right? Ya Man!  So what do you do to get there? 1st you must start with a stable system. There are no short cuts here. Peeps with no patients need not apply. Now with a stable system begin lowering CPU PLL. Start at 1.5v cpupll  run 3dm11 (my preference) or PCM11 or Super Pi the point is benchmark your system at least 3 times record the results go back to bios bump cpupll up a notch +.05v run 3dm11 again 3 time record the results. Repeat the process until you reach 1.80v cpupll. Consider your highest average bench results your cpupll sweet spot. Switch to the sweet spot now and run Prime 1344 & 1792 30 min each. If you pass that  now it's time to try lowering vcore one notch then run Prime max mem 1344 & 1792 iterations 30 min each again, keep lowering vcore & stress testing until you begin to fail go back into the bios and bump vcore back up two notches and run Prime95 w/max mem for 12 hrs. If you pass you have now fine tuned your system to the lowest possible voltages and consequently temps as well. Notice a pattern here? Always try one thing at a time then Test each and every adjustment and back that up with a 12hrs stability run.

About the memory it's always best to overclock with only two dimm slots populated but I certainly understand with 2Gb sticks why you would want all 4 making sticks running so the later is not an option. I think you may have gotten form the above it's best to focus on one thing at a time and sometimes that means taking things out of the picture that could be an obstacle. Like running your memory at slower than rated speed. Doing so takes them out if the picture as the potential cause of a failure while stressing your system. Once you have stabilized your system at a given clock you can turn your attention to the memory bump it up to rated spec and run Memtest if you can pass 12 hrs of that you know your memory is stable but you will also have to stress test your entire system again with Prime with the new memory settings. Like I said if you in a hurry move on this stuff ain't for you buy a Dell leave it stock and get a new one when that one breaks. lol

Oh by the way, with your process here, is it really recommended to bum back up two notches of vcore when I begin to fail prime95? One notch is too close to the limit?

Is this two notch up recommendation also applicable when I'm at the first step of looking for my stable vcore?
Edited by kevindd992002 - 8/4/12 at 7:40am
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post #9294 of 10702
2 bumps will save you a bit of time. and 2 bumps is .010v. while .005v isnt really significant in finding stability when you want to get close.
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post #9295 of 10702
Quote:
Originally Posted by pc-illiterate View Post

2 bumps will save you a bit of time. and 2 bumps is .010v. while .005v isnt really significant in finding stability when you want to get close.

What do you exactly mean?
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post #9296 of 10702
guys I'm new to sandybridge overclocking and I need some help.I have made the right changes to the bios according to the tutorials,but when I run cpu-z it show the stock frequency after some seconds.What I'm doing wrong?

Thanks
post #9297 of 10702
Quote:
Originally Posted by owcraftsman View Post

The first screen should qualify you for the Sandy Stable Club so good job!!
The vcore seems to be a bit high but that may be what is needed got your proc.
If so then I'd say you have little headroom to go higher otherwise see if you can get that vcore down a bit and still pass 12hr prime.
Also if you want Super Stable status you would need to use all available memory when running Prime. It appears you ran the default torture test which uses only 1600mb of memory.
That can be changed by ticking the "Custom" box in the opening dialog window and entering a larger amount in the memory field. I see you have 16gb installed from the Task Manager dialog. note: you have 11995mb available memory so it would be safe to type in 11000 mb. This will utilize 97% of your memory throughout the Prime testing. This will give you a better representation of stability and again qualify you for Super Stability.

If you have not done so already lower you CPU PLL to say 1.6v from the default of 1.8v which may enable you to use a lower vcore. Unfortunately any changes you make will have to be re tested for stability but that won't change your Sandy Stable status. Nice Work! GL

Quote:
Originally Posted by Jayjr1105 View Post

He's actually at 4.6 but you're right, a 4.6 oc would need something like 1.34-1.38. Try adjusting the negative offset in the BIOS until you are somewhere in that range when under load.

I changed some settings in the BIOS as suggested above; changed the CPU PLL to 1.6000v, applied a negative offset of 0.010 and increased the RAM usage to 14336MB and retested.

As Jayjr1105 suggested, my Vcore dropped down to about 1.360v with a temperature of about 68-75 deg C; Prime only ran for just over 6 hours before we had a power outage. rolleyes.gif So I'm assuming that I can tweak a little more out the CPU, with a little more help/advice of course. biggrin.gif
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post #9298 of 10702
Hi guys. I have a 2500k with an ASUS Z77 motherboard. Is there a guide for overclocking the 2500k with the Z77 motherboard? I think I've missed it somehow. I can't find it anywhere
 
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post #9299 of 10702
Quote:
Originally Posted by kevindd992002 View Post

Oh by the way, with your process here, is it really recommended to bum back up two notches of vcore when I begin to fail prime95? One notch is too close to the limit?

Is this two notch up recommendation also applicable when I'm at the first step of looking for my stable vcore?


Sorry it took so long to get back. Work has be hectic.

 

 

If you are passing 30 min of 1344 & 1792  @ 1.XX vcore and lower it one notch or .005v and it fails the same tests YES I would raise your vcore two notches up or .010 before I would consider a full 12-18 or 24 hr run. This is true with offset or manual vcore methods. At least it's what works for me.

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post #9300 of 10702
Quote:
Originally Posted by OC-Noobie View Post

Quote:
Originally Posted by owcraftsman View Post

The first screen should qualify you for the Sandy Stable Club so good job!!
The vcore seems to be a bit high but that may be what is needed got your proc.
If so then I'd say you have little headroom to go higher otherwise see if you can get that vcore down a bit and still pass 12hr prime.
Also if you want Super Stable status you would need to use all available memory when running Prime. It appears you ran the default torture test which uses only 1600mb of memory.
That can be changed by ticking the "Custom" box in the opening dialog window and entering a larger amount in the memory field. I see you have 16gb installed from the Task Manager dialog. note: you have 11995mb available memory so it would be safe to type in 11000 mb. This will utilize 97% of your memory throughout the Prime testing. This will give you a better representation of stability and again qualify you for Super Stability.

If you have not done so already lower you CPU PLL to say 1.6v from the default of 1.8v which may enable you to use a lower vcore. Unfortunately any changes you make will have to be re tested for stability but that won't change your Sandy Stable status. Nice Work! GL

Quote:
Originally Posted by Jayjr1105 View Post

He's actually at 4.6 but you're right, a 4.6 oc would need something like 1.34-1.38. Try adjusting the negative offset in the BIOS until you are somewhere in that range when under load.

I changed some settings in the BIOS as suggested above; changed the CPU PLL to 1.6000v, applied a negative offset of 0.010 and increased the RAM usage to 14336MB and retested.

As Jayjr1105 suggested, my Vcore dropped down to about 1.360v with a temperature of about 68-75 deg C; Prime only ran for just over 6 hours before we had a power outage. rolleyes.gif So I'm assuming that I can tweak a little more out the CPU, with a little more help/advice of course. biggrin.gif


Power Failures aside it appears you are heading the right direction. It's hard to tell if you can go lower but running the P95 custom 1344k and or 1792k iterations for 30 min each may be a good indication of whether you can go lower or not.  Work those two test until you fail and then + bump your vcore .010 and run a long test.  like mentioned above in my last post. GL

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XSPC Raystorm Pro corsair sp120 high performance led tygon E-1000 1/2 ID x 3/4 OD plasticizer free kryographics Pascal for NVIDIA TITAN X and GTX ... 
CoolingCoolingCoolingCooling
Mayhem Pastel White UV Monsoon center compression fittings  Alphacool NexXxoS XT45 Full Copper 280mm radiator  Alphacool NexXxoS UT60 Full Copper 240mm radiator  
CoolingCoolingCoolingOS
Monsoon Series Two D5 Premium Dual Bay Reservoi... Phanteks PH-F140SP Case Fan Aquacomputer backplate for kryographics Pascal ... Windows 10 Pro x64 
MonitorMonitorKeyboardPower
Asus PG278Q Gsync (Primary) Asus PB278Q (Extended) Corsair Gaming K70 LUX RGB Mechanical Gaming Ke... CORSAIR HX Series HX750 750W ATX12V 2.3 / EPS12... 
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  • [Official] The Sandy Stable Club **Guides, Voltages, Temps & BIOS Templates** Inc SPREADSHEET
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