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What is my CPU doing (throttling at low temps)?

post #1 of 4
Thread Starter 
Noob here. Last CPU I overclocked was a Pentium 233MMX.

I have an i7-2600k on an Asrock Z77 Pro4-M. Have been playing with overclocking for a few weeks. I can run it at 4GHz for hours with negative voltage offsets and never go above 57C (Noctua single tower, dual fans)

When I jump to 4.1, 4.2, 4.3GHz, while steadily increasing the voltage works to keep the CPU running (no BSODs), the clock will throttle to 3400MHz right around 58-59C, and come back up to 4.1/.2/.3 at around 52C. Then it runs for a bit, and drops back to 3400MHz near 60C.

Running Prime95 Blend, VLC playing a BluRay, and flying around in the F16 in Google Earth over Rio (lots of models with textures) is my test.

I am afraid to turn off thermal throttling in the BIOS because I have no idea what effect that will have (how high temps will climb and if I can shut the system off quick enough, else risk damage).

Been reading tons about this CPU, and quite a bit about this board, and above 4GHz should be relatively simple, although I am having a hell of a time.

I did find that I have to have my top-mounted 140mm fan running as intake to keep cool air blowing over the VRMs. That helped a lot (used the throttle at 4GHz)

Any suggestions or advice? I've read tons of guides and have been playing with voltage offsets and all kinds of other things. Just can't figure out why the CPU will run fast for a while and then drop to stock speeds -- well below thermal limits as per the mfg spec.

Thanks.
post #2 of 4
Quote:
Originally Posted by tucansam View Post


I did find that I have to have my top-mounted 140mm fan running as intake to keep cool air blowing over the VRMs. That helped a lot (used the throttle at 4GHz)

You sure heat still isn't the problem? Any way to check the heat on that VRM? If you were throttling at lower speeds, then changed your cooling and were able to go higher, you could have hit that envelope again. VRM has it's thermal limits too and your mobo will likely throttle when those are reached, even though your CPU has room left.
Jarvis
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Jarvis
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Pepto Pony
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AMD FX-8350 @ 4.8Ghz CROSSHAIR V FORMULA-Z MSI GTX 980 Gaming 4g 16Gb G. Skill Ripjaws 4x4 @ 1600 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 PRO 128Gb SSD Intel 160 Gb SSD Intel 250 Gb SSD Generic DVD-RW 
CoolingCoolingCoolingCooling
2 x Noctua (NF-P12-1300 )1300rpm Premium Silent... Alphacool NexXxos UT60 Full Copper Radiator 240 Noctua NF-A6X25 FLX Quiet Computer Cooling Fan ... NZXT Sentry Mesh Fan Controller w/ Five 30 watt... 
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2 x Corsair Air Series SP120   COUGAR CF-V12H Vortex Hydro-Dynamic-Bearing  Monsoon 90° Rotary Angle Fitting - 5/8" - Red Bitspower Dual / Single D5 Top Upgrade Kit 100 ... 
CoolingCoolingCoolingCooling
ModMyToys DreamFlex Premium 3/8" ID Tubing Reta... Coolance Liquid Coolant Bottle, 700mL Fluoresce... Coolance PMP 450 Variable Speed D5 Pump Bitspower D5 Mod Top V2 Pom version 
OSMonitorKeyboardPower
Microsoft Windows 7 Ultimate Samsung KS8000 4k UHD 65" Microsoft Wireless Comfort 5000 Keyboard and Mouse SeaSonic M12II 750 
CaseAudio
My TV Stand Cabinet Creative Sound Blaster X-Fi Titanium 
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FX-4300 Gigabyte GA-78LMT-USB3 EVGA Geforce GTX 260 G.Skill Ripjaws X 
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Windows 7 Ultimate 64bit Toshiba Regza 52" 1080p Logitech K400 Antec EarthWatts Green EA-380D 
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post #3 of 4
Thread Starter 
Wizard, thanks for the reply. The problem is very likely the VRMs. They get hot enough that I can't keep a finger on them for more than a fraction of a second. With the board outside the case and fans directing air onto the two VRM heatsinks directly, I was able to get up to 4.2-4.3GHz last night, and it held there for some time before throttling.

The motherboard I have is not known for shockingly high quality power delivery, and the VRM heatsinks are about half the size as its ATX/gamer counterpart.

As an aside, do VRM heatsinks generally subscribe to any standard (ie the two plastic mounting posts on each side that poke through the motherboard, are all heatsinks made to mount the same, dimensionally speaking)? Trying to figure out if upgrading the VRM heatsinks would help, if that's even possible or practical.

Thanks.
post #4 of 4
Quote:
Originally Posted by tucansam View Post

Wizard, thanks for the reply. The problem is very likely the VRMs. They get hot enough that I can't keep a finger on them for more than a fraction of a second. With the board outside the case and fans directing air onto the two VRM heatsinks directly, I was able to get up to 4.2-4.3GHz last night, and it held there for some time before throttling.

The motherboard I have is not known for shockingly high quality power delivery, and the VRM heatsinks are about half the size as its ATX/gamer counterpart.

As an aside, do VRM heatsinks generally subscribe to any standard (ie the two plastic mounting posts on each side that poke through the motherboard, are all heatsinks made to mount the same, dimensionally speaking)? Trying to figure out if upgrading the VRM heatsinks would help, if that's even possible or practical.

Thanks.

The VRM temp shouldn't be a problem for such a board at all but you know z77 platform is old now maybe the thermal pad go bad over the time.. take the VRM heatsink out to make sure there is an thermal pad between the VRM and the heatsink
   
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The White Dark
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Samsung Nvme 960 Evo 500GB Pny CS1311 480GB ThermalTake Water 3.0 Extreme 360m + Triple Rin... Windows 10 Pro 64Bit 
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