2500k @ 4.5ghz with Vcore @ 1.18

[Idontcare]

Yeah, that is what was making me confused. I was using less volts than others, but yet I still had the same temps. I was confused and I thought that CPU-Z must have been reporting it wrong, so that is why I started a thread.

It is odd though. Core Temp says one, CPUZ and HWMonitor say another. 0_0

I use realtemp, I have confidence in the realtemp temperatures because when I was doing a bunch of high-temperature studies with my 2600K (passive cooling and so on) realtemp correctly reported the temps when I hit the internal throttling point of the CPU (CPU throttles at 98°C and realtemp shows that the temp is 98°C when the CPU does start throttling, verified).

 

[MrTransistorm]

It is odd though. Core Temp says one, CPUZ and HWMonitor say another. 0_0

CoreTemp and RealTemp report VID. CPUz, HWMonitor, HWiNFO64, and most others report Vcore.

 

[SHAQ]

I use realtemp, I have confidence in the realtemp temperatures because when I was doing a bunch of high-temperature studies with my 2600K (passive cooling and so on) realtemp correctly reported the temps when I hit the internal throttling point of the CPU (CPU throttles at 98°C and realtemp shows that the temp is 98°C when the CPU does start throttling, verified).

So you sacrificed the life of your CPU for science or did you need to reseat your cooler? 😀

 

[Idontcare]

So you sacrificed the life of your CPU for science or did you need to reseat your cooler? 😀

LOL, all of the above 😛

Seriously though, running your CPU at TJmax is not a problem, TJmax is set to the value it is set to so as to ensure that it is not a problem if your CPU operates that hot.

If it was a problem then TJmax would be set lower such that it throttled before it became a problem.

Where high temps become truly problematic is when you have taken the CPU out of spec in some other capacity in the process. Higher clockspeed or higher voltage or both.

Then the factory set TJmax (98C for SB) is no longer valid. For example, if Intel intended to release a 4.5GHz Sandy Bridge with the Vcc bumped up to say 1.4V then they'd undoubtedly decrease the TJmax by however much is necessary to ensure the expected lifetime of the chips still exceeded their internal targets for QRA and warranty purposes (10yrs typically).

So the TJmax for such a hypothetical CPU might be 88C, or 78C. (coincidentally this is why AMD's CPU's do have lower max allowed temps than Intel's, they have to lower that max temp to avoid running into field-fail issues over time)

Thus, when we overclock our CPU's, we do need to be mindful that the practical TJmax is decreasing even if the actual TJmax used in the chip's circuitry is not.

I would not operate my CPU near TJmax when it was overclocked for any sustainable duration. But yes, in the name of science I did just that 😀

 

[Shoda]

CoreTemp and RealTemp report VID. CPUz, HWMonitor, HWiNFO64, and most others report Vcore.

What is the difference?

 

[Cookie Monster]

This seems a little weird but one of the cores on my i5 2500k is constantly pegged at 4.5GHz ever since a windows update (voltages are low and other cores do go idle).. does anyone have this symptom? (a bit OT but just curious to see other SB users experience this).

 

[Puppies04]

This seems a little weird but one of the cores on my i5 2500k is constantly pegged at 4.5GHz ever since a windows update (voltages are low and other cores do go idle).. does anyone have this symptom? (a bit OT but just curious to see other SB users experience this).

What software is reporting this?

 

[Idontcare]

What is the difference?

VID = voltage the CPU is programmed to tell the BIOS it needs to be supplied with. For Sandy Bridge the VID is both multiplier dependent as well as power-state dependent. The VID changes when your CPU goes from load to idle, and that is why the Vcc changes when your CPU goes from load to idle.

Vcc = supplied voltage. Regardless what the VID is, the BIOS could be programmed (by the BIOS writer, or by a user-changeable input such as CPU voltage setting in the BIOS) to set the VRMs to deliver a different voltage to the CPU.

 

[Cookie Monster]

What software is reporting this?

HWinfo64 and aida64 both shows this.

 

[Shoda]

VID = voltage the CPU is programmed to tell the BIOS it needs to be supplied with. For Sandy Bridge the VID is both multiplier dependent as well as power-state dependent. The VID changes when your CPU goes from load to idle, and that is why the Vcc changes when your CPU goes from load to idle.

Vcc = supplied voltage. Regardless what the VID is, the BIOS could be programmed (by the BIOS writer, or by a user-changeable input such as CPU voltage setting in the BIOS) to set the VRMs to deliver a different voltage to the CPU.

Thanks a lot.

So, what I am up to now is I am overclocking all 4 of my cores. I disabled throttling so that my computer will always be at 4.5ghz. So far, temps are higher than they usually are, 10+ degrees higher since I am no longer using an offset, but using a fixed Vcore of 1.3v. Temps with IBT fully loaded range from 60c - 80c. I am going to keep it like this for a week or so for a MOD over at Toms Hardware. He wants some feedback.

 

[Smartazz]

Been googling my 2500K batch 3134B737 and found this thread. Seems like this batch is pretty good. I haven't done a max overclock, but my 24/7 setup is 4.5GHz at 1.3v, but it was pretty stable at 4.7GHz.

 

[Puppies04]

but it was pretty stable at 4.7GHz.

Sorry to have to point this out but there is no such thing as pretty stable as far as this forum is concerned, it is either stable or not. 😀.

On a side note how old is this chip? My 2500k was stable (overnight prime/100 very high IBT runs) at almost .1v lower than my current overclock for the first few weeks of use since then I have to add vcore to stabilise it.

 

[Smartazz]

Sorry to have to point this out but there is no such thing as pretty stable as far as this forum is concerned, it is either stable or not. 😀.

On a side note how old is this chip? My 2500k was stable (overnight prime/100 very high IBT runs) at almost .1v lower than my current overclock for the first few weeks of use since then I have to add vcore to stabilise it.

About a month. I say pretty stable because it passed 27 rounds of IBT, then froze when I accidently kicked my PC. I then backed off to 4.5GHz to ensure total stability. It'll run IBT at 1.3v 4.5GHz for hours so it's definitely stable at that speed.

Btw, what is your current vcore for your 4.5GHz overclock?