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4770K adaptive voltage 1.3V

bonomork
Level 7
My rig is rock solid with 4,3GHz@1.3V (linkpak, aida, XTU passed with a manual Vcore 1.265 but for cpu occt test I need 1,3V).
Now I'm runnig 1.3V adaptive voltage with energy saving enabled.
There is something that I dont understand: hwmonitor records, during ingame sessions, a 1,3Vcore @ full load, but Im reading a peak of 1,4V on vcore Max (even with League of Legend).
Could you explain please ? I was aware to use a manual vcore for stress testing with AVX2 instructions, but not for gaming.
Is my cpu running safe ? do you have any suggestions ?

Rig Config as follows:
Case CM HAF X - Mb ASUS Maximus VI Hero - I7 4770K@4,3Ghz - SWIFTECH H220 - ASUS Radeon R9-290 DirectCU II - SSD 3,5" SAMSUNG 840 250GB + 1 HDD Seagate 1,5T - Monitor ASUS PB278Q - DDR3 Corsair Vengeance 2X4 GB CMZ8GX3M2A1600C9@1866 Mhz - PSU Corsair AX860 - Corsair M40 + Corsair Vengeance K70
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3 REPLIES 3

bonomork
Level 7
now my rig is running with fixed vcore, all C-states enabled. Finally Vcore drops at idle. No more adaptive voltage.
Just another question: what are the suggested cache voltage settings ? Manual @ ?V or auto..

PowerOver9K
Level 9
There is no "magic" #. The lowest you can go while being 24/7 stable.
Mobo: Rampage IV BE | CPU: i7-4930@4.5ghz Hexacore | RAM: 32GB Corsair V-Pro | GPU: 4xR9 290X Quadfire | PSU: eVGA P2 SuperNOVA 1000W\G2 850W | Chassis: NZXT Phantom 820 | Cooling: XSPC Raystorm CPU Block\4xEK 290X Block\2x Laing D5\XSPC Dual Bay Res\Phobya G-Changer 1080 External Rad\Alphacool 140UT60\XSPC AX360 | Fan Con: Lamptron CW611 | Tube: Primochill Adv. LRT Bloodshed Red | 3xCrossover 27" 2560x1440 Monitors | Build Log of Insanity

jab383
Level 13
The speeds and voltages are in an acceptable range for a 4770K. OCCT is a more stringent test than linkpak, Aida, Prime95, Realbench or XTU. I get the same results: OCCT needs more volts to show stability. I think of OCCT stability as 'unconditional stability' because 'stability' at any of the lesser levels gives me blue screens in everyday work. My 24/7 profile will always be OCCT stable. When I'm pushing a benchmark, that profile may be no more stable than the particular benchmark needs.

Adaptive voltage with Turbo enabled will stick an additional 0.1 volts onto Vcore when the CPU sees certain instructions in the program -- most notably AVX instructions. A jump from a 1.3v setting to 1.4 is as expected. Adaptive voltage with energy saving will keep the average temperature cooler -- a good thing. If the profile is stable with a manual 1.3, it will work. Lower peak voltage is less alarming, but the CPU will draw moderate power all the time. Stability is the operative criterion. I would consider 1.3 to 1.4 volts 'safe' along with the water cooling of the Swiftech kit, but the power levels would be beyond air cooling.

The CPU works well with cache clock within 300MHz below the core clock. Within 200MHz is better , eg. 4.1ghz or more with a 4.3ghz core. There is no benefit to cache clock higher than core. The rule of thumb I use is to set cache clock 200MHz less than core and set cache voltage equal to Vcore -- manual or adaptive the same as core. Check for stability in OCCT, then step Vcache down .01 volts per step until OCCT finds an error, does a freeze-up or BSOD. Then I set Vcache to the lowest stable voltage step. If the stable Vcache is higher than Vcore, drop cache clock to 300MHz below core and repeat the voltage stepping. I know that sounds tedious, but that's the nature of OC tweaking.

All the above are opinions based on my experience with several Haswells. Hope they help.

Jeff