Intel CPU's maximum voltages and temps! - Page 4 - Overclock.net

Rick Arter · 03-18-09

Great post there's a bunch of good info there some I don't understand.

PizzaMan · 03-18-09

Yea, Intel leaves a lot to be desired as for as data sheets go.

nebuchanezzar · 03-26-09

I don't put any faith in the temperature rating of 68C. I will explain why.
Until recently all temperature probing for CPUs was done at the socket. That is where your motherboard reads the temps for it's shut down limits. The fact that we have software readable temperature probs inside the chip now has just exposed what has always been true, the internal core temperature is OBVIOUSLY higher than the temperature at the IHS or at the socket. If you pay attention to your monitoring software you will see a substantial difference between your "core temps" and your CPU temp. They are being read from entirely different places and yes it does make that much of a difference.
Intels i7 will downclock at 98C, that's not shutdown, that is drop to a 12x multiplier. The shutdown temp is 102C if I recall correctly. That is core temperature, not socket temperature. Under water cooling for example, when I get my cores to break 70C with severe stress testing my CPU temp is in the 40's as read by software. In my bios it lists two different cpu temps. Cpu and core. The core is always at least 10C higher than cpu temps even at idle in bios shots. For me to reach a 60+ temp at the socket I would have already shut down for exceeding 100C+ most likely.
Do some testing and a little bit of reasoning as much of this is a new ballgame. In the end though, it's still just OC'n the same as it has always been. How cool can you keep it and how many volts are you willing to smash into it.

ChickenInferno · 03-26-09

Quote:

Originally Posted by nebuchanezzar

I don't put any faith in the temperature rating of 68C. I will explain why.
Until recently all temperature probing for CPUs was done at the socket...

as in for the last couple of years...
Core 2 CPU's measured their core temps by a TJ Max system with temp measuring programs guessing at what the TJ Max was. The Core i7 chips have their specific TJ Max being read directly off of the chip so that the temp monitoring programs can accurately measure the temps.

68C is probablly real or else they wouldn't have put the number out. It is most likely extremely conservative, but still that doesn't mean it's completely useless.

nebuchanezzar · 03-28-09

No, the 68C is TCase maximum, not TJmax. Look in Chapter 6 of the whitepapers for the i7 found here. Page 22 has voltages and lists tCase max being in Chapter 6. Please show me where they have listed the TJmax. The closest we have to actually knowing is that the cores downclock at 98C and shutdown at either 102C or 105C.

Everyone started spreading the 68C without doing any research. It is the maximum AMBIENT temperature around the heatsink recommended by Intel. They are assuming a delta of 30C or less under normal usage. Notice that is ambient in the case, not in your room too. To know the truth you have to sift thru all the BS.

They have published more on the subject but I haven't gotten around to reading it all yet. You can find that here.

PizzaMan · 03-28-09

Intel doesn't mention TJmax anywhere in there data sheet. From what I under stand the core sensors read the distance from TJmax. Each chip's TJmax is not going to be the exact same. Some chips will downclock at 98 some at 102. Software writers for programs like CoreTemp use an average temp like 100c. That way the monitoring software can make a calulation from the distance from TJmax.

Example: The DTS sensors is reading 30C from TJmax so CoreTemp will read 70C, but it might actually be 68C or 72C depending on the chip.

nebuchanezzar · 03-28-09

Quote:

Originally Posted by PizzaMan

Intel doesn't mention TJmax anywhere in there data sheet. From what I under stand the core sensors read the distance from TJmax. Each chip's TJmax is not going to be the exact same. Some chips will downclock at 98 some at 102. Software writers for programs like CoreTemp use an average temp like 100c. That way the monitoring software can make a calulation from the distance from TJmax.

Example: The DTS sensors is reading 30C from TJmax so CoreTemp will read 70C, but it might actually be 68C or 72C depending on the chip.

Exactly my point. They only list Tcase max and storage temp, not an operational temp. What we have we are judging mostly by what the internal sensor does. Shutdown @ 100+C give or take.

denrocks2 · 03-29-09

e2140; e2160; e2180; e2200???

totalz · 04-05-09

PizzaMan, can u post the E6X00 seriers?

According to Intel, the E6320 I'm using has the same VID voltage as the Core voltage, 0.85V-1.5V. However, the bios and some applications show the VID and Core voltage as 1.35V. If VID is safe to follow, but it's also the max here... a bit confusing, so 1.5V is good to go without degrading the chip? I want to know its max temp too, and the safe temp of course. Thanks.

http://ark.intel.com/cpu.aspx?groupId=29754
http://processorfinder.intel.com/det...px?sSpec=SLA4U