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What is the max. safe voltage for i7-860?

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Aug 13, 2005
Gainesville, GA
I search this forum and could not find an answer to this question.

I found on the intel website:
Intel® Core™ i7 Processor I7-860
Processor Specifications:
sSpec Number: SLBJJ
CPU Speed: 2.80 GHz
PCG: 09B
Bus Speed: 4.8 GT/s
Bus/Core Ratio:
L3 Cache Size: 8 MB
L3 Cache Speed: 2.8 GHz
Package Type: LGA1156
Manufacturing Technology: 45 nm
Core Stepping:
CPUID String: 106E5h
Thermal Design Power: 95W
Thermal Specification: 72.7°C
VID Voltage Range: 0.65-1.400v

According to Intel the i7-860 is good up to 1.400 volts and the maximum temperature it should operate is 72.7°C.

Is this accurate?

I have recently put together a new system:
CPU: i7-860
RAM: GSkill Trident DDR3 SDRAM 2000 (4 x 2GB)
HDD: 2 x WD 640GB
Graphics: 2 x Sapphire HD 4890
Heatsink: Thermalright Ultra-120 eXtreme Rev.C

Currently testing with Prime95 running large FFTs, cpu running @ 3920MHz with 1.264v (as reported by CPU-Z), memory running @ 933.3MHz (9-9-9-24-2T).
Temps have maxed at 62, 60, 60, 63 reported by RealTemp (3.40) and 60, 59, 58, 62 reported by CPUID Hardware Monitor.

Just noticed worker #3 stopped after about 20 minutes. Going to up the voltage a bit to see if that helps.


Senior Member
May 10, 2009
Thermal spec is where the cpu will run at max full load with the OEM heatsink if fed 30*c air. It has nothing to do with the max safe temp, which is Tjunction.

Voltage... Yeah, i'd say it looks like 1.4v. However, i doubt you could get it there on air without hitting tjunction.


Aug 13, 2005
Gainesville, GA

Thanks for the reply.

Before I tried overclocking this CPU, I ran the 860 at stock speed, voltage and the stock heat sink; it ran up to 72°C running Prime95 in about 5 minutes. Room temp was probably about 74°F/23°C. So I shut Prime95 down.

Bumped the voltage up to 1.280v now.
After 10 minutes running Prime95 temps have stabilized at 61, 59, 58, 63.

I'm running the computer next to an open window so the air going in is about 52°F/11°C.
I have the system in a Antec Twelve Hundred Black Steel ATX Full Tower Computer Case with three 120mm fans in front, 2 in back, and a 240mm on top.


Aug 13, 2005
Gainesville, GA

I kicked up the voltage and the clocks.

Now at 1.29375v in BIOS and 1.304v in CPUz.
CPU running at 4GHz.
Full load temps are 62, 61, 60, 65.

I tried it initially at 1.35 volts in BIOS and the temps shot up to 72 immediately on starting Prime95. So I started reducing voltage to where I am now. I will keep dropping voltage until it fails Prime95 within an hour, then go up a notch in voltage.
Also have the memory running at 2000MHz 9-9-9-24-1T @ 1.65v.


Sep 25, 2009
Those temps seem fine. When you get to the seventies then start thinkin and worrying.. gl


New Member
Nov 18, 2009
My not so great experience

When I run my PC at normal room temp 22-24C, cpu core temps are close to 80C during linx or Prime testing (except one core which always have 2-4C lower temps).

Farwalker: I have the same mobo and processor (cooler Zalman CNPS10 Extreme), memory is lower spec G.Skill 1600MHz (7-8-7-24-2T) which runs well over 1800MHz with 1.65V and 8-9-8-24-1T (4x2GB).

I can't get reliable system over 3.86GHz (when cpu volts go over 1.3V temps seem to rise fast), 184x21, 193x20 are OK, C1E, Speedstep and Turbomode disabled of course (actually bios disables them). I have to raise also PLL and PCH and especially IMC volts to 'unsafe' values.

Right now I try to run my PC with dynamic OC when Speedstep, C1E and Turbomode are enabled but then I can't get over bclk 156, immediate BSOD when logging into windows if even one notch over that. Just for consuming less power, but it seems that power savings might not be so great. Power meter shows 380-400W during prime and games. I have measured max. 435W from wall socket (includes monitor and Creative 5.1 speakers and sub) during Linx and Prime testing with static OC.

Perhaps I have a problem with my PSU, Antec TruePower2 550W, 3 years old (from my old system). I have 8800GTS (G80) + 4 HHDs and 1 SSD + DVD-burner and PCI-soundcard + 6 case fans installed in Antec P180 case.