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OC i7 920 w/ Asus P6T Deluxe V2

post #1 of 5
Thread Starter 
Hi everyone,

I'm starting to OC my CPU, trying to understand what I'm really doing. I'm tired of just imputing values in the BIOS without having any idea what they mean. For that, I've been doing some reading, especially in this topic: ​http://www.overclock.net/t/538439/guide-to-overclocking-the-core-i7-920-or-930-to-4-0ghz.

My system is the following:

- Intel Core i7-920 2.66 GHz D0
- Noctua NH-U12P SE2
- Asus P6T Deluxe V2
- G.skill Ripjaws Series 6GB (3 x 2GB) DDR3 1600 (PC3 12800)
- MSI GeForce GTX 970 Gaming 4G
- Corsair HX750W


I use 2 Noctua NF-A14 FLX and a Noctua NF-P14 redux-1200 as intakes and the Fractal Design stock fan that came with the case as the exhaust. I'm using MX-2 thermal paste from Artic. The heatsink was seated only a couple of days ago.

With the CPU stock, I get around 37-41 ºC in idle and mid 60's under Prime95 load (I'm doing the Small FFTs test). I've got a D0 chip.


I got my CPU to the following state last night:



This was taken with Hyperthreading DISABLED. My idle temperatures, as you can see, are around 47-51 ºC.
In the thread I've mentioned above, the OP advises to disable HT when the CPU is getting too hot on load. I did that and brought my temperatures from 80-85 ºC to 70-75 ºC under load on Prime95.

My first question is, do I really take advantage of the HT when playing or do I only need it when I'm working on 3D for example? If it's like this, I think I prefer to save a lighter OC on my BIOS profile so that I can run with HT enabled when I need to work. Otherwise, HT would be off for playing.

Now, with HT disabled I can get this thing to 4.2 GHz. Notice that I haven't run Prime95 for 24 hours. I'm just experimenting by now. When I raised my BCLK to 210 the system won't get to windows and just restarts (1.35 v). These are the results I get with this clock:



My temperatures just stall around 75 ºC about 10 minutes into the test. They don't seem to go any further even if I left the test running for a couple of hours.

I guess I need to ask, what can I assume as safe temperatures for the i7 920 on Prime95? Can I only remain for 70-75 ºC under load? I think I've read somewhere that if doesn't pass 80-85 ºC it's fine.


This were the settings I've used in the A.I. Tweaker:





One thing that's bugging me is that I'm using 1.35 as my CPU voltage. Every other thing is running in "Auto" as you can see. I notice that when I bump the BCLK Frequency to 210 it gets unstable and reboots before entering Win10. Maybe it would need more voltage. My problem is that I read that ~1.4 v should be the maximum limit but ASUS states that it's something like 1.375 v. So, should I bump my CPU voltage a little higher to try and reach 4.4 GHz?

Another question: is it advisable to define any more voltages manually? If it's possible to go up in the OC I'd like to try it. If I need to use any other manual voltages where do you guys recomend me to start? And with what values? This is a great problem for me because in the guide I followed, the OP starts to change some voltages but I don't know why he chose those values.

In the guide the OP talks about Vcore (VID), Vdimm and QPI/Uncore (VTT). Well my MB, as you can see, has CPU Voltage, CPU PLL Voltage and QPI/DRAM Core Voltage. I don't know how the OP's terms relate to my MB settings. I only understood that Vcore is labeled CPU Voltage in my BIOS. Where do the other relate?
This is why I left all the other voltages in "Auto". Not knowing if I'm touching the right setting annoys me.


I've manually entered my RAM CAS latency values:



I chose to use 6x DRAM Frequency multiplier for now. Also the UCLK Frequency is 2x my DRAM Frequency.
Can I raise my DRAM Frequency, at least, to their original 1600 MHz or should I keep this low for now? I really don't know why a 8x multiplier or higher can cause instability.

This is my CPU configuration. Following the thread mentioned in the beginning of this post I've set this settings accordingly:




So, am I doing anything wrong? I'm kind of worried of leaving many voltages being managed automatically by the CPU. The problem is that I need help to understand which of them to change and why am I changing them. Playing with the ratios to achieve a specific clock is not hard. My problem is using manual voltages and tweaking them down until I maintain stability and reduce temperatures and power.
I really don't have any certainty in what I'm doing. But if this thing can go above 4.0 GHz safely I want it. Notice that I haven't run proper Prime95 tests. I still don't know if it can even perform stable at 4.0 GHz. I'm just trying to make it stable at 4.2 GHz for the time being. If I need to lower the clock I will. It amazes me that I can get 10 ºC lower just by disabling HT and thus giving me even more temperature room to raise my BCLK.

I'm sorry for the long thread. I love to learn new things but I really need to understand what I'm doing. I thank for any guidance you guys can give me.

Thank you for reading.
 
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post #2 of 5
That's the first processor and board I started over clocking with, and I got basically the same results. Searching around this forum is what helped me with my learning too. Anyways, the other voltages can be controlled manually but in my personal experience they don't help much. I remember something about the CPU PLL being limited helped with temps by 2 degrees or something, and cpu spread spectrum being off helps too.

Anyways, what seemed to give the best performance for me was 4.0 with HT or 4.2 without. D0 stepping also. If temps under load for a few hours don't break 85 you should be fine. It doesnt thermal shutdown until 100 and technically can take short bursts of 90 but that's like 4.2 with HT and isn't worth wearing it down so fast.

Sorry I don't remember the values. I always use my laptop now and my desktop isn't even hooked up. Being an adult sucks sometimes XD
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RAMRAMHard DriveOptical Drive
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by Cindex View Post

That's the first processor and board I started over clocking with, and I got basically the same results. Searching around this forum is what helped me with my learning too. Anyways, the other voltages can be controlled manually but in my personal experience they don't help much. I remember something about the CPU PLL being limited helped with temps by 2 degrees or something, and cpu spread spectrum being off helps too.

Anyways, what seemed to give the best performance for me was 4.0 with HT or 4.2 without. D0 stepping also. If temps under load for a few hours don't break 85 you should be fine. It doesnt thermal shutdown until 100 and technically can take short bursts of 90 but that's like 4.2 with HT and isn't worth wearing it down so fast.

Sorry I don't remember the values. I always use my laptop now and my desktop isn't even hooked up. Being an adult sucks sometimes XD

I guess that one of my first strugles is to understand how the terms from the guide correlate to the ones in my MB.
Quote:
In the guide the OP talks about Vcore (VID), Vdimm and QPI/Uncore (VTT). Well my MB, as you can see, has CPU Voltage, CPU PLL Voltage and QPI/DRAM Core Voltage. I don't know how the OP's terms relate to my MB settings. I only understood that Vcore is labeled CPU Voltage in my BIOS. Where do the other relate?

I need to make a correspondence between Vcore, Vdimm and QPI/Uncore (VTT) in my MB.
 
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Intel Core i7 6700k Z170 Pro Gaming/Aura MSI GeForce GTX970 TWINFROZR V Gaming 4G OC 4GB... G.Skill Ripjaws V 16GB ( 2x8GB ) DDR4-3200 CL16 
Hard DriveHard DriveCoolingOS
Samsung 850 EVO 500 GB Western Digital Caviar Black 1 TB Noctua NH-D15 Microsoft Windows 10 Professional 
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BenQ XL2411Z Seelseries 6GV2 Corsair RM750x Fractal Design Define R5 
MouseMouse PadAudio
Microsoft IntelliMouse Explorer 3.0 Steelseries Qck+ Heavy Sennheiser GAME ZERO 
CPUMotherboardGraphicsRAM
Intel Core i7-920 2.66 GHz Asus P6T Deluxe V2 ATI Radeon HD 5870 G.Skill Ripjaws 6GB PC12800 
Hard DriveHard DriveHard DriveHard Drive
Samsung 850 EVO 250 GB Western Digital Red 3 TB Western Digital Red 3 TB Western Digital Red 3 TB 
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Hard DriveHard DriveCoolingOS
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post #4 of 5
Your QPI freq is getting out of stable range. QPI PLL and IOH are linked to it's stability. I am currently using 1.30v for both. What is your VTT called on the asus boards?

What is your uncore speed at also?
     
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post #5 of 5
Quote:
Originally Posted by jncunha View Post

So, am I doing anything wrong? I'm kind of worried of leaving many voltages being managed automatically by the CPU. The problem is that I need help to understand which of them to change and why am I changing them. Playing with the ratios to achieve a specific clock is not hard. My problem is using manual voltages and tweaking them down until I maintain stability and reduce temperatures and power.
I really don't have any certainty in what I'm doing. But if this thing can go above 4.0 GHz safely I want it. Notice that I haven't run proper Prime95 tests. I still don't know if it can even perform stable at 4.0 GHz. I'm just trying to make it stable at 4.2 GHz for the time being. If I need to lower the clock I will. It amazes me that I can get 10 ºC lower just by disabling HT and thus giving me even more temperature room to raise my BCLK.

I'm sorry for the long thread. I love to learn new things but I really need to understand what I'm doing. I thank for any guidance you guys can give me.

Thank you for reading.

@jncunha depends on what you're trying to achieve. Higher memory clock or CPU? Or both...

Overclocking the i7-920 above 3.8 GHz doesn't really bring any performance benefits.
Between 3.6 GHz - 3.8 GHz is the optimum I would recommend for optimal practical performance. That way you will also keep your CPU alive longer. [ That comes from a guy who killed a CPU recently biggrin.gif ]
I have mine i7-920 D0 clocked at 3.619 MHz @ 20 multi, 180 bus speed and 1.184v.

There are so many guides for overclocking i7-920 on an ASUS motherboard that I won't have enough time to list them all.
But this is the guide that you're looking for: i7 920 Overclocking Guide

It explains most of the settings and clocks the CPU slowly up to over 4 GHz. I would RECOMMEND for you to overclock it to
Quote:
Step Five: The Sweet Spot This step your goal is to achieve 3.6-3.8Ghz (turbo) on ~ 1.2v
Anything beyond that is pointless. No real life benefit.
After each step test for stability! Then proceed to the next overclocking step.

Have fun and good luck!
Edited by masterdev - 8/7/16 at 10:15pm
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