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Regular temperature shifts during load tests on my OCed i3770k - Also need help improving my OC (@ 4400MHz)!

post #1 of 3
Thread Starter 
Hi guys, I'm pretty new to the overclocking world, and have been reading a lot about it, trying to overclock a i3770K on my brand new PC.
The reason I'm writing is because I'm seeing some very regular temperature shifts during long load tests, while neither the frequency nor the load are changing.

First of all, here is my build:

Case: NZXT Phantom 410
CPU: Intel i3770K
CPU cooling: Corsair H100i
MB: Asus P8Z77 WS
Memory: 16 Gb (2x8) Corsair Vengeance 1866 MHz
GPU: MSI HD 7950 Twin Frozr III OC Edition
PSU: Seasonic X850 (Gold Series)
SSD: Crucial M4 128Gb
HD: hasn't arrived yet
BluRay: LG 14x ReWriter

This is how I setup the fans on my case: cpufansetup_Davi.jpg 96k .jpg file
I found this picture of my case on the web, and just adjusted it by removing (red box) the fans I don't have - sorry for the poor drawing skills. A side fan is represented by a gray box.

From the picture, I have these:
- Frontal: 1 NZXT 140mm fan,controlled by the case (@ max) - In
- Side: 1 NZXT 120mm fan,controlled by the MB (@ 1000 RPM) - In
- Back: 1 NZXT 120mm fan,controlled by the case (@ max) - Exhaust
- Top: 2 Corsair 120mm fans that came with the Cooler (@ Performance setup) - Exhaust

I have overclocked the CPU to modest 4400 MHz, using 1.260v (the first stable voltage I could find for that frequency), and am running Prime95's Torture test.

Here is a picture showing all the tools I'm using for the load tests to run them, measure data (frequency, voltage,temps) and store the temperature for the graph (with RealTemp): loadTestsScreen.jpg 864k .jpg file
I'm not running anything else with the CPU load test.

What I see during tests is that about every 15 minutes temperatures will rise from about 63ºC to about 75ºC, and stay there for about 15 minutes. After that,it will drop back to the 63ºC in no more than a couple minutes,and stay there for about 15 minutes, and this pattern keeps repeating throughout most of the test time. It used to happen all the time on all the tests, but only this time it had a big hicup from around 6AM to 10:30AM.

Here is the temperature graph I took from a 12 hours 100% CPU load test, polling data every minute, using about 14Gb RAM: 12h_temps.jpg 75k .jpg file
and here is the full spreadsheet containing frequency, temp and CPU load: RealTempLog.xlsx 74k .xlsx file

Do you guys have any idea on why the temperatures could be having these regular shifts?
As an important side question, do you have any advice to improve my OC? I`m not satisfied with the frequency I could get to (only 4400), but I didn`t want to cross the 80ºC temp barrier. I would love if I could keep the temperatures the lowest, to then try to increase the frequency.

Thanks,
Davi
post #2 of 3
When using prime95 it shifts between small and large fft's if left on blend. It alternates between the two and small fft's create more heat than higher fft's. This is why you see the cycle in temperatures.

As far as the time between 6am and 10am I would think that is when your home was coolest? Even outside temps the lowest temp is usually seen around 1 hr or so before sunrise.




As far as case fans it looks like you are using someone else's picture? and that you have 1 intake front, 1 exhaust rear, and 2 exhaust on the h100?

If that's the case I would suggest more positive pressure. Try turning the rear fan around and making it an intake to see if that makes any difference. Right now the h100 is acting like a vacuum cleaner trying to suck air out of the case.

I'm a novice overclocker myself only knowing the basics so I cant really help on that front.
   
CPUMotherboardGraphicsGraphics
I7-3770K Gigabyte GA-Z77X-UP7 Saphire R9 290 Saphire R9 290 
RAMHard DriveHard DriveHard Drive
Corsair Dominator Platinum OCZ Vertex 4  OCZ Vertex 4 Seagate  
CoolingOSMonitorKeyboard
Custom Loop Windows 8.1 QNIX QX2710LED Logitech G710 
PowerCaseMouseAudio
Cooler Master V1000 Zalman GS1000 Logitech G502 Sound Blaster Z 
CPUMotherboardGraphicsGraphics
i7-3770k MSI Z77A-GD65 XFX HD 7870 Black Edition XFX HD 7870 Black Edition 
RAMHard DriveHard DriveHard Drive
Corsair Vengeance OCZ Vertex 4 OCZ Vertex 4 Seagate Baracuda 
Hard DriveOptical DriveCoolingOS
Seagate Baracuda Sony BR Corsair H100i Windows 8.1 PRO 
PowerCaseAudio
Corsair TX850w Old Gateway Case Creative Sound Blaster Z 
  hide details  
Reply
   
CPUMotherboardGraphicsGraphics
I7-3770K Gigabyte GA-Z77X-UP7 Saphire R9 290 Saphire R9 290 
RAMHard DriveHard DriveHard Drive
Corsair Dominator Platinum OCZ Vertex 4  OCZ Vertex 4 Seagate  
CoolingOSMonitorKeyboard
Custom Loop Windows 8.1 QNIX QX2710LED Logitech G710 
PowerCaseMouseAudio
Cooler Master V1000 Zalman GS1000 Logitech G502 Sound Blaster Z 
CPUMotherboardGraphicsGraphics
i7-3770k MSI Z77A-GD65 XFX HD 7870 Black Edition XFX HD 7870 Black Edition 
RAMHard DriveHard DriveHard Drive
Corsair Vengeance OCZ Vertex 4 OCZ Vertex 4 Seagate Baracuda 
Hard DriveOptical DriveCoolingOS
Seagate Baracuda Sony BR Corsair H100i Windows 8.1 PRO 
PowerCaseAudio
Corsair TX850w Old Gateway Case Creative Sound Blaster Z 
  hide details  
Reply
post #3 of 3
Thread Starter 
Thanks a lot sinnedone, I had no idea that was Prime95 doing it. That's a relief. thumb.gif

As for the case cooler, I also have one on the side, so pressure should be somewhat balanced. I have actually ordered a couple more Corsair SP120, the original idea being to replace H100i's for their noise level. But I'm not sure I'm doing it yet, I might end up putting them in the front and bottom of the case instead.

Again, thanks a bunch!

P.S.: Still I have no idea why my OC is so poor... I was getting BSOD with code 3b, that made me think it could be the memory... but I'm not sure about it.

I followed this guide to setup my BIOS for the OC: http://www.overclock.net/t/1291703/ivy-bridge-overclocking-guide-asus-motherboards, and ensured timings were the same as in the memory sticker, so I'm hoping memory configurations are OK.
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