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post #10341 of 10701
I've been playing with my 2500K again and I have to say, this little beast impresses me a LOT.

Teaser:


It was just a screenshot took during a 2 hours LinX AVX run which it completed without a hitch. Was using Prolimatech PK-1 then and it got pretty toasty with 84c peak temps, but I went out to the store this noon and bought me some Coollaboratory Liquid Ultra. That performs a heck of a lot better and a 60 minute re-run of the test showed 77c as max temps.

No idea if it'll survive Prime95, but i'll leave it running overnight to see how far she gets.

It's not a good benching CPU as strangely enough max multi is just 56 with 2 cores and I can't bench any higher then 5560Mhz on 1.612v really..
But for 24/7 this things a beast.. Does 5Ghz on 1.372v, 5.1Ghz on 1.400v, 5.2Ghz on 1.432v and 5.3Ghz on 1.472v. Some amazing vcore scaling there as I'm used to have to scale 0.05v per 100Mhz >4.8Ghz.

But, I will be totally honest with you guys, only the 5.1Ghz @ 1.400v was tested with 16 hours of Prime95! The rest was all tested using 2 hours of LinX AVX and I can't say that they are ''stable'' stable.

So, how do you fellas like my CPU tongue.gif

P.S. I used to use a MSI Z68A-GD80 and I thought of it as being high-end and good for OC. But, the board would just randomly shutdown @ >1.440v and wasn't stable above 5.1Ghz. Also it has no offset vcore whatsoever so no power saving meaning 51w idle @ 5.1Ghz 1.408v.

I bought a Open Box ASUS P8Z68-V Pro cause it does have power saving and proper FET's and such, and this board lifted the CPU to these amazing clocks so the board has a quite substantial impact on overclocking in this case.
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post #10342 of 10701

Hi Friends!

 

Just wanted to share...I was able to acquire a copy of a particularly "modified" BIOS version (version F3H) for the Gigabyte GA-P67A-UD7-B3...thanks pc-illiterate for the advice of trying to reach out to sin0822 (and along the way I was able to request for a copy of this BIOS version from valvehead).

 

In this BIOS version, there are only 2 levels of LLC compared to the latest official BIOS for my board (which is version F7). Still, better than nothing. :)

 

Now I can try overclocking via "Offset Voltage" while using LLC!

 

 

 

 

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post #10343 of 10701
Quote:
Originally Posted by Imprezzion View Post

Warning: Spoiler! (Click to show)
I've been playing with my 2500K again and I have to say, this little beast impresses me a LOT.

Teaser:


It was just a screenshot took during a 2 hours LinX AVX run which it completed without a hitch. Was using Prolimatech PK-1 then and it got pretty toasty with 84c peak temps, but I went out to the store this noon and bought me some Coollaboratory Liquid Ultra. That performs a heck of a lot better and a 60 minute re-run of the test showed 77c as max temps.

No idea if it'll survive Prime95, but i'll leave it running overnight to see how far she gets.

It's not a good benching CPU as strangely enough max multi is just 56 with 2 cores and I can't bench any higher then 5560Mhz on 1.612v really..
But for 24/7 this things a beast.. Does 5Ghz on 1.372v, 5.1Ghz on 1.400v, 5.2Ghz on 1.432v and 5.3Ghz on 1.472v. Some amazing vcore scaling there as I'm used to have to scale 0.05v per 100Mhz >4.8Ghz.

But, I will be totally honest with you guys, only the 5.1Ghz @ 1.400v was tested with 16 hours of Prime95! The rest was all tested using 2 hours of LinX AVX and I can't say that they are ''stable'' stable.

So, how do you fellas like my CPU tongue.gif

P.S. I used to use a MSI Z68A-GD80 and I thought of it as being high-end and good for OC. But, the board would just randomly shutdown @ >1.440v and wasn't stable above 5.1Ghz. Also it has no offset vcore whatsoever so no power saving meaning 51w idle @ 5.1Ghz 1.408v.

I bought a Open Box ASUS P8Z68-V Pro cause it does have power saving and proper FET's and such, and this board lifted the CPU to these amazing clocks so the board has a quite substantial impact on overclocking in this case.

Damn nice chip you've got there. I've owned 3 i5 2500K's (all very different batch numbers too) and none of them would do 4.6-4.7 without 1.4v or more, and from there the scaling got worse and worse (have never gotten a stable 5.0GHz)
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post #10344 of 10701
I've had one more that could do this, my other 4 we're as you described. 4.6-4.8Ghz with ~1.40v. The other one did 5.1Ghz on 1.448v but wouldn't go higher. Sold it to a bit more ''pro'' overclocker as it DID have a benchstable x58 max multi with 2 cores enabled and x59 with 1 core.

Just to make u less jelly tongue.gif It will not run Prime95 overnight on these settings. One core crapped out @ 4 hours and another @ 9 hours. The other 2 made the 12 hours mark.
I think / hope it'll do 5.2Ghz on 1.456/1.464v stable but it's not worth the temps.. I'm back on 5.1Ghz 1.392v. Nice and cool smile.gif
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post #10345 of 10701

Hi Friends,

 

Since I have already learned the following:

 

1. Manual Method of Overclocking

2. Offset Method of Overclocking

 

...right now I'm learning how to tweak QPI/VTT (a.k.a. VCCIO) and PLL voltages. smile.gif So based on what I have read in this thread (thanks for the excellent guides!), I would need to run Prime95 "Custom" Blend, trying out 1344 and 1792 in the settings, with 90% of available RAM. Here are my questions:

 

  1. 90% of available RAM: to clarify, basically I will check how much RAM is currently available/unused and then calculate 90% of that...correct? It was tough for me to get actual 90% usage once I ran the "Custom" blend, because the RAM usage is fluctuating (prior to the test). During the actual test (I'm looking at it right now), the usage is between 82% to 88%...mostly around 87%. Is that acceptable to the requirements?
  2. When will I stop the test? I tried 1344K and it "finished" after arounc 30 to 35 minutes. As in Prime95 says it's finished. Now I'm running the 1792K and it's already been an hour and it's not yet finished...how long does 1792K usually take to finish? Or do I just stop this after an hour even if it didn't finish yet? <--LOL...silly me. I stopped the 1792K Test and I saw the same notification that showed up when I finished the 1344K. So it means I was the one who stopped the 1344K test, hahaha!
  3. The Offset Voltage Value Question: a lot of posts here talk about "negative" value in the Offset Voltage. In my case, for a 4.5GHz, I need a "positive" value. For example, a +0.015 gives a VCore of 1.308 volts...a +0.035 gives a VCore of 1.344 volts...a +0.020 gives a VCore of 1.320 volts. But for most forum members here, to get these VCore voltages they use a negative value. Is this something I should be concerned about, or is it just because different motherboard brands calculate offset differently? I noticed that most who coin "negative" offset are using ASUS/ASRock/ROG, while I'm on Gigabyte (P67A-UD7-B3).

 

By the way this is for a 4.5GHz of overclock. Here are the settings currently in BIOS (still running the 1792K Custom Blend Test...tpying on a laptop right now):

 

  1. DVID (Offset): +0.025 (gives me a 1.332v VCore in BIOS)...In the OS and running full load (running 1792K Custom as I type), VCore in CPU-Z wavers between 1.296 and 1.308.
  2. Load-Line Calibration Level: Auto
  3. QPI/VTT (VCCIO): +1.100 (to match the XMP-provided value for my Corsair RAM...I didn't use XMP profile so I set it manually)
  4. DRAM Voltage: 1.640 (there's no 1.65 Volts in my BIOS selection) which gives 1.644v when reading this from software/monitoring apps
  5. Command Rate: 2 (to match the XMP-provided value for my Corsair...I preferred to manually set this instead of using XMP profile)
  6. CPU PLL: currently trying the lowest available of 1.520 (based on the guides, start with the lowest and then run the Prime95 Custom Blend...so I already finished the 1344K and currently still running the 1792K...already 1 hour and 15 minutes as I type this)
  7. PLL Overvoltage: Disabled
  8. Turbo Ratio: 45 on all 4 Cores
  9. TDP: set to 200
  10. C1E: Enabled
  11. C3/C6: Auto
  12. Thermal Throttling: Enabled
  13. BCLK: 1002 (100.2MHz)

 

Thanks in advance!


Edited by topet2k12001 - 5/27/13 at 3:30pm
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post #10346 of 10701
honestly, i think most people using neg offset have a higher llc level. the lower the llc, the more load voltage you need and vice versa. use the lowest llc level you can while using the lowest offset you can.
i think, not know, the higher the llc and neg offset cause a lower idle voltage. i can check that as soon as i boot and see.

*EDIT1*- make sure you check your load percentage in realtemp when running low pll voltage. i set a low pll and was only getting 50-75% load. my cores werent fully loading under prime.

*EDIT2*- yep, and vcore raises when load is applied. not exactly what everyone had in mind when llc wasnt a bios motherboard feature but a hardcore overclockers solder mod.
now to reset my bios to my real values that work right wink.gif
Edited by pc-illiterate - 5/27/13 at 6:47pm
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post #10347 of 10701
Quote:
Originally Posted by pc-illiterate View Post

honestly, i think most people using neg offset have a higher llc level. the lower the llc, the more load voltage you need and vice versa. use the lowest llc level you can while using the lowest offset you can.
i think, not know, the higher the llc and neg offset cause a lower idle voltage. i can check that as soon as i boot and see.

*EDIT1*- make sure you check your load percentage in realtemp when running low pll voltage. i set a low pll and was only getting 50-75% load. my cores werent fully loading under prime.

*EDIT2*- yep, and vcore raises when load is applied. not exactly what everyone had in mind when llc wasnt a bios motherboard feature but a hardcore overclockers solder mod.
now to reset my bios to my real values that work right wink.gif

 

+ rep...thank you for even going above and beyond to try it on your system!

 

Thanks for the clarification. I did just that as well and notice the same thing: I now have to apply a "minus Offset" when LLC is being used at the same time. I thought it was just the brand of the motherboard.

 

I have flashed to a "modified" BIOS (c/o valvehead and with advice from Sin0822) version F3H...this version allows for usage of LLC and Offset at the same time! :) There are only two (2) LLC levels in this version but I have PM'd Sin0822 and was advised that these 2 LLC Levels are the "best" levels out of the 10 available levels in latest official BIOS versions.

 

Observations when I tried it on my system:

 

When Offset is combined with LLC (I use Level 1 of 2 available Levels):

 

  1. I now have to set a "negative value". Example: to achieve a BIOS VCore of 1.332, that would be around -0.040.
  2. Idle is higher (1.xxx) than what I was getting when I was on stock.

 

When Offset is NOT combined with LLC:

 

  1. To achieve say, a BIOS VCore of 1.332, that would be +0.025.
  2. Idle is lower ("like-stock"), i.e. 0.9xx.

 

Between the two scenarios, I opted to stay without LLC Levels...at least for this 4.5GHz overclock. I didn't see an advantage other than "statistically" or "numerically" seeing lower VCore with LLC Levels enabled (and that's just 1-2 increments of "better VCore"). But temperature-wise, I recorded both scenarios and they gave me the same temperature ranges (I already record all of my stress-testing sessions with HWiNFO). I was seriously hoping/expecting to see a difference, but...well...anyway, it's okay. It was the learning part was actually more fun. :)

 

It looks like LLC usage, combined with Offset Method (as well as Manual Method of overclocking) is more useful and beneficial if one were to embark in high-overclock scenarios, say 4.8GHz and above, based on what I have been reading in this thread so far. Maybe this is where we will see the advantage of the LLC.

 

Thanks for the tip in watching the % Load when stress testing with low-voltage CPU PLL...I made sure that I did that. :) In my case, (Offset NOT combined with LLC) I did not see the adverse effects that you have described.

 

With regard to tweaking PLL and VCCIO (QPI/Vtt), here is my progress so far.

 

VCCIO: I kept this at 1.10.

RAM Voltage: I kept this at 1.64

 

Reason for both is the same reason as this post: http://www.overclock.net/t/968053/official-the-sandy-stable-club-guides-voltages-temps-bios-templates-inc-spreadsheet/9060#post_17379289

 

 

Quote:

Originally Posted by owcraftsman View Post


Not sure about the AsRock board but on the Asus boards (should be similar) I had to increase my VCCIO (VTT) from default to 1.1 and increased my Vdimm from default 1.5 to 1.65 for rated timings and speed (1866). I should also note my kits don't default to 1t command rate either however that's how I run them. The settings used allowed me to pass two instances of HCI Design Memtest beyond 200% coverage without errors which I considered stable memory. Beyond that prime passed as well.
 It all boils down to how good the IMC is on your proc and the compatibility of your kits with the system. Furthermore be sure all 4 sticks are identical for best results. GL

 

CPU PLL: I did as advised in the First Page of the thread, as follows:

 

  1. Start at 1.5v (for my motherboard the lowest was 1.520)
  2. Execute Prime95 "Custom Blend" tests, using 1344K (min and max) as well as 1792K with 1-minute cycle time...run for 30 minutes and watch if there will be a BSOD.
  3. If BSOD->I increased the CPU PLL by a notch up.
  4. Wash, rinse, repeat<--I'm currently at this part. :) Right now I'm about to test 1.580v.

 

I did notice that as I went up one notch at each attempt of Prime95 Custom Blend, that it takes longer for BSOD to happen. So I think I'm on the right track. :)

 

Just wanted to share (I wanted to document all my actions anyway so I think it would be best to just keep on posting updates in this thread...makes it easier to find information).


Edited by topet2k12001 - 5/27/13 at 8:57pm
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post #10348 of 10701
good luck with all your tweaking. i only tweaked mine for good temps and stability. i went from a 212+ to an h100 to a full blown custom loop. my temps started decent and right now theyre great. its definitely going to take some patience and time. neither of which i have or wanted to to spend. i would rather play planetside2 or bf3 rather than p95 tongue.gif
again good luck! thumb.gif
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post #10349 of 10701
Quote:
Originally Posted by pc-illiterate View Post

good luck with all your tweaking. i only tweaked mine for good temps and stability. i went from a 212+ to an h100 to a full blown custom loop. my temps started decent and right now theyre great. its definitely going to take some patience and time. neither of which i have or wanted to to spend. i would rather play planetside2 or bf3 rather than p95 tongue.gif
again good luck! thumb.gif

 

Lol...I never had interest in overclocking from the time I had this system over a year ago too. It was not until recently that I chanced upon this thread (it's munaim's fault! j/k).

 

Thanks again for all the advice and help. Very wonderful community here. smile.gif

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post #10350 of 10701

My adventures in Overclocking (Part 2)

by: topet2k12001

 

Hi Friends,

 

I would just like to share this. Everything is based off from reading the excellent guides found at the First Page of this thread. I am new to overclocking and so far, it has been fun!

 

Achievements by following the guides:

 

  1. Manual Method of overclock (fixed voltage)
  2. Offset Method of overclock without Load-Line Calibration due to BIOS version restrictions (variable voltage, i.e. VCore voltage behaves "like stock" voltages where it scales down when idle)

 

Guides for Initial Overclocking: Please see First Page, First Post. :)

 

In this post, I would like to share my adventure into tweaking the CPU PLL Voltages as indicated in the First Page. :)

 

Important Note: prior to this, I have already "found" my overclock settings via the methods mentioned above. I would suggest, just as other experts here always say, to try the first two methods first. This gets you "acquainted" with how your processor responds to various VCore Voltages, and how the processor behaves in each method of overclock. Not technically a pre-requisite, but I would say "yes it is a pre-requisite" because:

 

  1. It lessens the guesswork (since you already know the optimal VCore voltage for your designed overclock).
  2. It reduces the number of variables you will need to tweak at the same time (typically it's VCCIO a.k.a. QPI/Vtt, VCore, and CPU PLL). Having already "found" your optimal voltage prior reduces the variables to just two of them.
  3. The approach is relatively methodical hence, less confusion.

 

Tip: like what the experts here say....always record, always take notes.

 

My Settings for a 4.5GHz Overclock:

 

  1. VCore as reported in BIOS: 1.320v
  2. DVID/Offset: +0.010v (resulting to 1.320v VCore as reported in BIOS)
  3. DRAM Voltage: +1.644v
  4. VCCIO (QPI/Vtt Voltage): +1.100v

 

NOTE: for #3 and #4, I initially selected XMP Profile, noted down the DRAM Voltage and QPI/Vtt Voltage and applied it manually instead in BIOS so that I can run my RAM at its stated settings of 1600MHz at 1.65v with a Command Rate of 2

 

  1. CPU PLL: to be discussed below

 

Steps Done:

 

  1. Since I manually set my RAM as mentioned above, I may have eliminated one of the two variables (VCCIO, a.k.a. QPI/Vtt and CPU PLL are the two variables), so that leaves me with finding out the optimal CPU PLL Voltage.
  2. Per the guide in the First Page, I put my CPU PLL Voltage to 1.5v as the starting point (on my board, Gigabyte GA-P67A-UD7-B3, it was 1.520v).
  3. I ran Prime95 "Custom Blend". I ran two types of "Custom Blend": one with 1344K (min and max) and another with 1792K (min and max). Cycle Time is 1 minute. RAM: between 80% to 90%. Duration of test: at least 30 minutes, ideally 1 hour. See this post for an example.
  4. I initially got a BSOD 124.
  5. Reboot and go into BIOS.
  6. Adjust CPU PLL Voltage one "notch" (increment) higher than the previous one (in my case, previous was 1.520v, so I changed it to 1.540v).
  7. Save BIOS and reboot.
  8. Repeat Step 3.
  9. If you end up with BSOD 124 again like Step 4, repeat Steps 5 to 8. In my case, I observed that after each increase in CPU PLL Voltage, it took a longer time before I encountered a BSOD 124.
  10. What we are hoping to see here is that the BSOD will change from 124 to 101, because BSOD 101 is relatively a clearer indicator that you need to increase VCore...in other words, you may have already "found the sweet spot" for CPU PLL Voltage.

 

Results:

 

 

Explanation: as we can see, I started with 1.520v of CPU PLL Voltage. Initially I encountered BSOD 124. At each BSOD 124, I went into BIOS, increased CPU PLL Voltage by one "notch" and tested again. By the time I set it at 1.600v, I encountered BSOD again, the error message was no longer 124, but 101. :) So, on the next reboot to BIOS, I did not touch CPU PLL Voltage anymore but touched the VCore by moving it from +0.010v to +0.015v.

 

After I post this message, I will run Prime95 "Custom Blend" again to continue. I am anticipating that:

 

  1. It would take longer than my previous attempt before I see a BSOD.
  2. The BSOD may show 124 or 101. Either way, I would increase VCore. In my experience, I noticed that typically, when BlueScreenView application shows alternating 124 and 101 (as you increase VCore), it is getting closer to stability.
  3. I have "pre-defined" a limit to the VCore voltage addition that I would use. From my previous attempts, 1.344v was the highest to target, ideally should be 1.332v or 1.320v only (these were the voltages when I posted my official submissions).
  4. Without using LLC, these voltages give you (inclusive of drooping) as low as 1.296v, 1.284v, or 1.272v of VCore under full load (specifically, while stress-testing with Prime95).

 

Suggestion: in my experience, the effort involved in trying to push for getting 1.272v of VCore was not worth it as far as "net gains", i.e. normally we lower VCore with the objective of achieving lower temperatures. I have recorded my stress-test sessions where I got 1.296v, 1.284v, or 1.272v as the lowest-recorded VCore during the stress-tests, but the temperatures they all gave me were the same. At mild to moderate (4.5Ghz = moderate) overclocks, a 1-3 notch variance on VCore did not show me significant temperature advantages. Perhaps on higher overclocks this will be a very important factor (as well as usage of LLC). With that, I would say as a matter of suggestion, to just stay within that 1-3 notch variance, leaning towards which one gives you more stability.

 

If staying at the lower VCore (of the 1-3 notch variance) gives you good gains in temperature, then definitely go for it. It just so happened that in my experience i never saw it happening (unfortunately). The best "improvement" that I saw was 1 degree Celsius when I compared them, at the cost of time/effort/electricity bill. :D

 

Hope this helps! By the way I am not posting this to "reinvent the wheel" since there are already well-established documentation and guides in the First Page. My post is to merely confirm all those guides. :)

 

UPDATE #1:

 

Just finished running Prime95 Custom Blend for 1344K and 1792K, each at one hour, and passed both without BSOD error messages.

 

Following my post above:

 

  1. My VCore Offset Voltage (at the BIOS) prior to this run is at +0.015, which is a BIOS-reported VCore of 1.332v (EDIT: but wavering still at 1.320v in BIOS). In the Operating System at full-load (during stress test), it was wavering between 1.292v and 1.284v.
  2. VCCIO (QPI/Vtt) is at 1.10v and DRAM Voltage at 1.644 as indicated above as well, to account for manual configuration in place of using XMP profile for the Corsair RAM.
  3. As far as Power-Saving Options, C1E and EIST are Enabled, and then C3/C6 and Thermal Throttling are on Auto.

 

For me, this is a good indication that I am right on track, following the guides from the First Page of the thread. :) Next step: 12-hour Prime95 Regular Blend...but I may need to schedule it for a later time. Will keep everyone posted!

 

P.S.: how do you run a 12-hour Prime95 Custom (not Regular) Blend? If you have screenshots on what to check/uncheck or numbers to put in, I would appreciate it. I still plan on doing Regular Blend though...just curious so I asked.

 

UPDATE #2:

 

Hi Friends,

 

So I tried running a Prime95 "Custom Blend" Test and failed after 40 minutes. Following on from Update #1...

 

  1. BSOD Failure Code is 124.
  2. From here I have 2 options: either increase CPU PLL Voltage from 1.600v to 1.6200v (next "notch" up), or...increase Voltage Offset from +0.015 to +0.020 because at +0.015 Offset, the BIOS-reported VCore was still switching/wavering between 1.320v and 1.332v.
  3. I will try CPU PLL Voltage first, test with Prime95 "Custom Blend" 1344K and 1792K for an hour each, and then move with Prime95 12-hour "Custom Blend" test.

Edited by topet2k12001 - 5/28/13 at 8:59pm
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