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2600k multiplier going in between stock and my OC during stress tests

post #1 of 11
Thread Starter 
I have a 4.7ghz oc @ 1.424V on my 2600k but when I go to run prime95 the cpu multiplier flipflops between 47 and 35. It usually takes a few minutes of stress testing for this to start happening.

I have all the power and current limiters maxed as it says to do in this guide.

Tried updating bios. Disabling speedstep, C1E, C3, andC6 states.

It can't be due to thermal throttling because my cpu maxes at around 65c.

Any ideas on what could be causing this?
post #2 of 11

Could be the VRMs overheating.  What motherboard?

post #3 of 11
Thread Starter 
post #4 of 11

Try pointing a fan at the CPU socket area and see if that helps.  That high a voltage could be putting a lot of stress on the VRMs, and ASRock isn't exactly known for robust power delivery systems.

post #5 of 11
I'm also betting it's the VRM overheating and some kind of protection turning on. I had that problem on an ASRock Z77 Pro4-M. The CPU was a 3570k at 4.5 GHz, stable at about 1.2 V.

My case had pretty terribly ventilation. Something unfortunate might have been happening, a pocket of hot air being trapped in that corner of the case, and the tower cooler's fan not pushing air into the VRM heat-sink. If I look at pictures of the ASRock Z75 Pro3, this could be even more likely. I could imagine a tower cooler not moving any air over the VRM heat-sink as it's off to the side.

The Z77 Pro4-M board had one thermal sensor reading in HWMonitor and SpeedFan that looked like it might be the VRM. That reading was far below 100 C as I remember it. If it really was the VRM temperature, it should have been safe. I only tried touching the VRM heat-sink for a second or something, so I don't know if the VRM heat-sink was actually too hot to touch. The settings in the UEFI that sounded like they might disable the protection did not change anything, but you might try to see if it does something for you.
post #6 of 11
It's not the VRM's...

You need to give it more power, set the power limit to 200w and increase power limit to 140% and it'll be fine.
post #7 of 11
Quote:
Originally Posted by almighty15 View Post

It's not the VRM's...

You need to give it more power, set the power limit to 200w and increase power limit to 140% and it'll be fine.


He already said he did in his first post.

Quote:
I have all the power and current limiters maxed as it says to do in this guide.
post #8 of 11
It might just be the mobo...I had Z68 pro3 gen3, and when I gave my 2500k more than ~1,33-1,34V, it started dropping multiplier under full load (multi fluctuating between stock 33 and overclocked whatever it was 44-45, easily visible in cpu-z). Powerlimits were maxed and so on. If voltage was ~1,3V, multiplier NEVER dropped under full load.

With those voltages (and with HT on)... your board simply cannot handle it...
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @4,5GHz @1,336V Asus P8Z68-V/Gen3 MSI HD7950 TFIII @1150/1500Mhz@1,1v  8gb Team group Vulcan 2133MHz 
Hard DriveHard DriveOptical DriveCooling
Samsung spinpoint F3 1TB WD Caviar blue 1TB LG Coolink Corator DS 
OSMonitorKeyboardPower
Win7 home 64bit BENQ G2320HDB @72Hz 4+ years old fujitsu siemens XFX core edition pro 750w 
CaseMouseMouse Pad
Antec 300 ultimate Logitech G5 steelseries WOW-edition 
  hide details  
Reply
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @4,5GHz @1,336V Asus P8Z68-V/Gen3 MSI HD7950 TFIII @1150/1500Mhz@1,1v  8gb Team group Vulcan 2133MHz 
Hard DriveHard DriveOptical DriveCooling
Samsung spinpoint F3 1TB WD Caviar blue 1TB LG Coolink Corator DS 
OSMonitorKeyboardPower
Win7 home 64bit BENQ G2320HDB @72Hz 4+ years old fujitsu siemens XFX core edition pro 750w 
CaseMouseMouse Pad
Antec 300 ultimate Logitech G5 steelseries WOW-edition 
  hide details  
Reply
post #9 of 11
RealTemp T|I Edition
http://www.overclock.net/t/1330144/realtemp-t-i-edition

Try the above version of RealTemp and right click on a temperature icon in the system tray and select the Power Limits menu option to check to make sure that the Turbo Power Limits you set in the bios are actually being used for your CPU. Sometimes what you think you have set in the bios and the power limits that the CPU ends up with are not the same.

The RealTemp reported multiplier closely tracks what the CPU is doing internally so it will give you a better idea if the multi really is flip flopping from 47 to 35 or if it is throttling more gradually.
post #10 of 11
Thread Starter 
Here are what RealTemp says my power limits are. Seems to be what was set in the bios.

PowerLimits

As for having airflow across the VRM's I have a 140mm fan that's drawing air across it. I would have to mod the case in order to do more.

VRM fan setup

Whats the chance there would be a thermal sensor for the VRM's? This is all I'm getting in speed fan.

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