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OC i7 2600 Sandy Bridge (mystery after reset the bios)

post #1 of 3
Thread Starter 
Hello!

First of all sorry for my bad english...

I've been using my stable OC for years but i had to reset the bios and set up again all the parameters and now something wierd it's happening...

My oc was/is stable @4,2ghz(+24%) clock + 105.0(+5%) bclk + mems @ 2,2mhz.


Now testing again i realize that in my hwinfo it's something i don't understand with the cpu core clocks. First of all they're not fixed @4,2 because the EIST, c1, 2, etc...Ok, but when i stress test the cpu when i click the button, INTANTLY the clock down to 4095 fixed. Why is that? no hight temps (max 65c) no visible throttling, etc...so why that downclock?

I tested with different stress tests, always the same, then i tracked the clocks with witcher 3 and it happen the same. Clock go down to 4095 and sometimes 4,2 and when i'm on windows doing NOTHING 4,2 stable. I really don't understand this...

I've been touching in the bios everything, disabling turbo boost and fixing the cores, disabling and enabling the power saving tools (EIST, etc...) nothing happens, etc...

The only thing i saw is that when i disable ALL the power saving tools the bios accept my 4,2 OC but then in windows the sensor show me a fixed and stable 4095 and if i activate them again i get the 4,2 but when i push the cpu doing anything not even a hard work they downclock to 4095 again.

Any ideas...?

Thank you.
post #2 of 3
Intel CPUs use Turbo Boost to reach maximum speed. Look in the bios or use HWiNFO to see what your turbo power limits are set to. When these limits are set too low, your computer will throttle and slow down when fully loaded.
post #3 of 3
If stress tests go up to 4.2 GHz then your overclock is running fine. It's just the power saving features putting the CPU clock speed and voltage lower. CPU intensive games will most likely push it up to 4.2 GHz, if not then you may want to disable these power saving settings to get full speed constantly if you want. (It will result in more power being used as it's less efficient)
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Gaming Computer
(19 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core 2 Quad Q6600 Asustek P5Q-PRO Nvidia 9800 GTX+ Kingston DDR2 8gb 
Hard DriveOptical DriveCoolingOS
Western Digital 1 TB Pioneer Noctua NH-U9B Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
Dell Monitor Logitech G110 Antec 750W Thermaltake Aluminium Old Case 
MouseMouse PadAudio
Logitech G500 Gaming Mouse Generic Mousepad Soundblaster 5.1 VX 
  hide details  
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