Overclock.net › Forums › Intel › Intel - General › How do I stop my CPU from thermal throttling my multiplier?
New Posts  All Forums:Forum Nav:

How do I stop my CPU from thermal throttling my multiplier?

post #1 of 9
Thread Starter 
I'm having an issue overclocking my i7-920 under water. I can overclock up to 4.2Ghz, so far, but when I run any kind of stress test, after a few iterations, the CPU multiplier drops from 20 down to 12. I have to drop back to 4.0Ghz and reduce CPU voltage do stop the throttling. I'm fairly certain this is due to something reaching a thermal limit but I have not figured out how to increase the thermal limits to allow the overclock.

I'm using an EVGA x58 SLI LE motherboard with the latest BIOS but not sure if there is even a setting or what it's called to adjust the power limits to stop throttling. I have speedstep off.

Any ideas?

Daxx
post #2 of 9
How are the temps?

If CPU temps are ok, maybe the motherboard's VRMs are overheating. Adding a fan on top of them might help.


Here's how to put your rig in your sig:
http://www.overclock.net/t/1258253/how-to-put-your-rig-in-your-sig
TheSadFlute
(17 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI Golden Ed GTX980 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  HP 32' 1440p Logitech G710+ EVGA G2 750W 
CaseMouseMouse PadAudio
Cooler Master Stryker Logitech G602 Steel Series On-Board 
Audio
Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
  hide details  
Reply
TheSadFlute
(17 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI Golden Ed GTX980 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  HP 32' 1440p Logitech G710+ EVGA G2 750W 
CaseMouseMouse PadAudio
Cooler Master Stryker Logitech G602 Steel Series On-Board 
Audio
Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
  hide details  
Reply
post #3 of 9
Sounds a bit odd. Like eXXon I would like to know how hot your CPU is running. I don't remember the exact throttling temp for the 920 but its some where above 90°C and you should definitely not be letting an OC'd 920 run that hot.

How much Vcore are you using? I don't think there is an x58 mobo made that can't run some pretty extreme OC's with +1,6 vcore. I really don't think this is a power limit issue.
Edited by Bit_reaper - 11/14/13 at 11:12am
    
CPUMotherboardGraphicsRAM
i7 920 OC 4.0 GHz 1.35v HT on Asus P6T 1366 SLI Gigabyte GTX 970 OCZ 12GB DDR3 GOLD/Platinum mix 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F1 1TB Western digital 300GB Western digital Caviar Blue 1TB Samsung 840 EVO 250Gb 
Optical DriveCoolingOSMonitor
generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
MonitorMonitorKeyboardPower
ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
CaseMouseMouse PadAudio
Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
AudioAudio
Yamaha NS-50B floor tower speakers miditech Audiolink II stereo sound card 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 920 OC 4.0 GHz 1.35v HT on Asus P6T 1366 SLI Gigabyte GTX 970 OCZ 12GB DDR3 GOLD/Platinum mix 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F1 1TB Western digital 300GB Western digital Caviar Blue 1TB Samsung 840 EVO 250Gb 
Optical DriveCoolingOSMonitor
generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
MonitorMonitorKeyboardPower
ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
CaseMouseMouse PadAudio
Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
AudioAudio
Yamaha NS-50B floor tower speakers miditech Audiolink II stereo sound card 
  hide details  
Reply
post #4 of 9
Thread Starter 
Quote:
Originally Posted by Bit_reaper View Post

Sounds a bit odd. Like eXXon I would like to know how hot your CPU is running. I don't remember the exact throttling temp for the 920 but its some where above 90°C and you should definitely not be letting an OC'd 920 run that hot.

How much Vcore are you using? I don't think there is an x58 mobo made that can't run some pretty extreme OC's with +1,6 vcore. I really don't think this is a power limit issue.

Vcore is 1.4V and temp is running about 38C idle and never more than 75C (HW Monitor) under full load running IntelBurn TestV2. CPU-Z shows the multiplier drop from 20 to 12 after about 3 iterations on IntelBurn. I don't understand why.

Additionally, I can run Vcore at 1.38V and still have same issue. Less than that at 4.2GHz system gets unstable.

Here's the eye candy... smile.gif


Edited by Daxx123 - 11/14/13 at 11:49am
post #5 of 9
Warning: Spoiler! (Click to show)
Quote:
Originally Posted by Daxx123 View Post

Vcore is 1.4V and temp is running about 38C idle and never more than 75C (HW Monitor) under full load running IntelBurn TestV2. CPU-Z shows the multiplier drop from 20 to 12 after about 3 iterations on IntelBurn. I don't understand why.

Additionally, I can run Vcore at 1.38V and still have same issue. Less than that at 4.2GHz system gets unstable.

Here's the eye candy... smile.gif


Try flipping the exhaust fan the other way around making it intake & see if the throttling stops.
TheSadFlute
(17 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI Golden Ed GTX980 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  HP 32' 1440p Logitech G710+ EVGA G2 750W 
CaseMouseMouse PadAudio
Cooler Master Stryker Logitech G602 Steel Series On-Board 
Audio
Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
  hide details  
Reply
TheSadFlute
(17 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI Golden Ed GTX980 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  HP 32' 1440p Logitech G710+ EVGA G2 750W 
CaseMouseMouse PadAudio
Cooler Master Stryker Logitech G602 Steel Series On-Board 
Audio
Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
  hide details  
Reply
post #6 of 9
Thread Starter 
Quote:
Originally Posted by eXXon View Post

Warning: Spoiler! (Click to show)

Try flipping the exhaust fan the other way around making it intake & see if the throttling stops.

Okay, I had some extra fans so I just hooked them up and set them on top of my case blowing down across the motherboard. It seems to have worked! Now I just have to figure out what is getting too hot so I can beef up the heatsink, or I have to resort to adding fans into the case which defeats the quietness of my water cooling system... Grrrr...
post #7 of 9
Quote:
Originally Posted by Daxx123 View Post

Okay, I had some extra fans so I just hooked them up and set them on top of my case blowing down across the motherboard. It seems to have worked! Now I just have to figure out what is getting too hot so I can beef up the heatsink, or I have to resort to adding fans into the case which defeats the quietness of my water cooling system... Grrrr...

The left side of the CPU which contains square blocks adjacent to each other.

Just try flipping that fan you originally had installed (Looks like it's a 14cm fan which should be more than enough to cool the VRMs) making it intake and see if it solves it on its own. Then no need for extra fans.

Quietness again thumb.gif
TheSadFlute
(17 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI Golden Ed GTX980 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  HP 32' 1440p Logitech G710+ EVGA G2 750W 
CaseMouseMouse PadAudio
Cooler Master Stryker Logitech G602 Steel Series On-Board 
Audio
Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
  hide details  
Reply
TheSadFlute
(17 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI Golden Ed GTX980 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  HP 32' 1440p Logitech G710+ EVGA G2 750W 
CaseMouseMouse PadAudio
Cooler Master Stryker Logitech G602 Steel Series On-Board 
Audio
Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
  hide details  
Reply
post #8 of 9
The power limits only control turbo boost. If they were limiting you, there would be no turbo boost so your CPU would be running with the default 20 multiplier.

The 12 multiplier is the minimum multiplier. Your CPU is not anywhere near the thermal throttling temperature so what is probably happening is the VRMs are getting too hot and sending a signal to the CPU. The signal path for this is called BD PROCHOT which means bi-directional processor hot. This allows other items on your motherboard to send a signal to trick the CPU into thinking that it is too hot. When this happens, the multiplier drops down to the minimum (12) just as if the CPU was too hot.

If your bios does not let you turn off BD PROCHOT then you can try using ThrottleStop. Think twice before doing this. Pushing too hard might cook your board.

ThrottleStop 6.00
http://www.thedigitalhq.com/downloads/
post #9 of 9
Thread Starter 
Quote:
Originally Posted by unclewebb View Post

The power limits only control turbo boost. If they were limiting you, there would be no turbo boost so your CPU would be running with the default 20 multiplier.

The 12 multiplier is the minimum multiplier. Your CPU is not anywhere near the thermal throttling temperature so what is probably happening is the VRMs are getting too hot and sending a signal to the CPU. The signal path for this is called BD PROCHOT which means bi-directional processor hot. This allows other items on your motherboard to send a signal to trick the CPU into thinking that it is too hot. When this happens, the multiplier drops down to the minimum (12) just as if the CPU was too hot.

If your bios does not let you turn off BD PROCHOT then you can try using ThrottleStop. Think twice before doing this. Pushing too hard might cook your board.

ThrottleStop 6.00
http://www.thedigitalhq.com/downloads/

I'm pretty sure your explanation, which is awesome, is totally spot on! Thank you very much for explaining this to me. I have been able to resolve the issue by adding a cooling fan over the VRMs. However, ThrottleStop sounds interesting and I might give that a try too, although I do think extra cooling is a much safer option.

You da man!
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Intel - General
Overclock.net › Forums › Intel › Intel - General › How do I stop my CPU from thermal throttling my multiplier?