My new i7-2600k and overclocking trials...

[blackphoenix]

Ok, so I recently upgraded from a dying AM2+ system/1090T and jumped on a I7-2600k.

I've been playing around with overclocking for the last couple days and found two Prime95 Small FFT and Large FFT stable settings and curious if this is par for course.

4.5ghz @ 1.3v ('Package' temp in CPUID HWMonitor is around 56C under load)
4.9ghz @ 1.385v ('Package' temp is CPUID HWMonitor is around 72C under load)
---Package temp always seems equal to or slight higher than the cores.

I haven't tried a 50x multiplier just yet, honestly sticking with 4.5ghz for now as the temps and voltages seem very nice.



Side related, anyone else have issues with core temps greatly ranging?
At idle I have this.

Core 0: 27C
Core 1: 30C
Core 2: 28C
Core 3: 23C
Package: 30C

-Asus Maximus IV Gene-z
-Intel I7-2600K
-Noctua NH-D14
-Silverstone FT02

 

[tweakboy]

Ok, so I recently upgraded from a dying AM2+ system/1090T and jumped on a I7-2600k.

I've been playing around with overclocking for the last couple days and found two Prime95 Small FFT and Large FFT stable settings and curious if this is par for course.

4.5ghz @ 1.3v ('Package' temp in CPUID HWMonitor is around 56C under load)
4.9ghz @ 1.385v ('Package' temp is CPUID HWMonitor is around 72C under load)
---Package temp always seems equal to or slight higher than the cores.

I haven't tried a 50x multiplier just yet, honestly sticking with 4.5ghz for now as the temps and voltages seem very nice.



Side related, anyone else have issues with core temps greatly ranging?
At idle I have this.

Core 0: 27C
Core 1: 30C
Core 2: 28C
Core 3: 23C
Package: 30C

-Asus Maximus IV Gene-z
-Intel I7-2600K
-Noctua NH-D14
-Silverstone FT02

The temps being couple degress different is perfectly normal. This started way back with Core 2 series. The surface of the CPU is not even, thats why people lap there CPU's and even heatsinks to get even contact and even temps. but ya I dont think you wanna take sand paper on your CPU I dont advise.

Anyhow what video card u got ?
You can raise the CPU voltage and the more Mhz you will get. People stop at 5Ghz, cuz if you want 5Ghz and above you need to run under water. because your CPU voltage would have to be near 1.5v ,,, just a heatsink with a cooler how much can it do ? your load temps will be different, and you will know exactly how much difference the first set of cores is from other.


Your OCes are great and your idle temps looks great and where they should be. so your set....

 

[blackphoenix]

I've got a EVGA Geforce GTX 560TI.

As far as the overclocks go, what load temps should I be mindful of?
I'm honestly used to AMD stuff so anything over 60C frightens me.

 

[BonzaiDuck]

I've got a EVGA Geforce GTX 560TI.

As far as the overclocks go, what load temps should I be mindful of?
I'm honestly used to AMD stuff so anything over 60C frightens me.

This has been discussed at length in other threads. The TJunction or TJMax temperature is around 90 to 100C.

The throttling specification when BIOS TM1 is enabled, is 72.6C.

These temperatures reference a general thermal spec or value called TCASE. TCASE is the temperature of the CPU's heat spreader -- its cap -- at dead center. It is generally accepted to be about 10C lower than an average of the core temperatures as measured by HWMonitor, CoreTemp, RealTemp, etc.

It is your choice to choose a temperature limit to your tweaking and over-clocking. Many say that 80C for the cores is OK. Before I was sure which utility was properly providing a TCASE value, I chose to stop raising voltage and speed when the average of the core temperatures reached 73 to 75C. While stress-testing, I disabled TM1. After stress-testing, I re-enabled it.

Looking at the monitor software that has been acknowledged to provide a value for TCASE, I'm still about 10C under the throttling spec, because the displayed "TCASE" never exceeds 65C under full load and even 80F room ambient.

 

[bryanW1995]

As long as it's not throttling or erroring out during stress tests you are fine. Last year I ran my i7 920 in the high 80's and low 90's for several weeks with no ill effects. And I routinely run my 1055t in the mid to high 70's, which is allegedly above tjmax.

 

[fastamdman]

What are your load temps? I would stick to any vcore under 1.45, try and see if you can get 5ghz stable. I would rock the 4.9 24/7. Hope my new chip does that

 

[mrjoltcola]

I've been playing around with overclocking for the last couple days and found two Prime95 Small FFT and Large FFT stable settings and curious if this is par for course.

4.5ghz @ 1.3v ('Package' temp in CPUID HWMonitor is around 56C under load)
4.9ghz @ 1.385v ('Package' temp is CPUID HWMonitor is around 72C under load)
---Package temp always seems equal to or slight higher than the cores.

I haven't tried a 50x multiplier just yet, honestly sticking with 4.5ghz for now as the temps and voltages seem very nice.

Tweakboy is incorrect - you don't need 1.5v for 50x, nor do you need water. Each chip is different.

Based on your 2 stable data points, you've got really nice, low voltages for those multipliers, and have a perfect chip for 5Ghz on air. Yours will do 50x at probably around 1.42v. 75C under Prime95 is very nice. Remember, your load temps under Prime95 don't represent what you'll see gaming or other CPU heavy workloads in general. Prime95 (and other torture tests) are meant to show the worst case scenario. Based on your voltages and temps, you should be plenty safe to run 49x-50x 24/7.

 

[fastamdman]

75c isn't exactly nice though. If you are running LinX or IntelBurnTest your temps would be much higher anywhere from 80-85c more then likely which is considered to high. You always want to stay under 80c. Obviously gaming/folding temps will naturally be lower then IBT/LinX but it's nice to ensure you are 100% safe in worst case scenarios to ensure reliability and safety.

With that said, yes your box can probably do 5.0ghz with low voltage. Great great chip, I am curious to know what the max multi is!

 

[Dadofamunky]

I consider long successful runs of small FFT and Large FFT Prime to be a Good Enough indicator of a successful OC. I don't bother with Prime anymore because I don't have the time to consign my computer to such testing; IBT is good for people like me who don't have the patience to sit through a 12-18 hr. test battery and want to know that my system will sail through a demanding workload. For anything I do, everything runs flawlessly (well, excepting things like stupid Firefox software bugs). That's good enough for me.

 

[Puppies04]

4.9ghz @ 1.385v ('Package' temp is CPUID HWMonitor is around 72C under load)

This is a very low voltage for 4.9ghz. If it is stable you have a very good chip there. When you say 72C under load what load are we talking about though? Is that while running prime, IBT, cinebench or something else ? Also is 72C the hottest temp you see on your hottest core?

Lastly, have you tweaked any other voltages in the bios and if so what are they running at? I'm interested in shaving a little from my VCORE (1.41v @4.7) if you have any suggestions.

 

[imaheadcase]

With that motherboard you got, i got the same one, you don't actually have to tweak anything for good overclock, just change multiplier. I put together the exact same rig this week, but a Corsair H80 instead.

I just put mine at x45, did not change anything else, and everything is gravy.
voltage is not changed at all, at 1.296v..under load it is 60c

The best part? the H80 fan is not even max, just medium. Never tried max, i heard its crazy loud though.
.
Sure i could go higher, but its so easy just to change multiplier and be done with it.

 

[blackened23]

It is normal for temperatures to vary across cores, yes. This has happened to me with several processors.

Your temps look pretty good. What i've found is that exceeding 4.8ghz barrier or 1.4vcore on the sandy bridge raises temps a LOT, which you seem to have found as well At 1.35 vcore at 4.7ghz, my CPU doesn't exceed 55c in prime95 testing. At 1.47vcore @ 5ghz, it goes up 10-12c higher.

 

[Puppies04]

With that motherboard you got, i got the same one, you don't actually have to tweak anything for good overclock, just change multiplier. I put together the exact same rig this week, but a Corsair H80 instead.

I just put mine at x45, did not change anything else, and everything is gravy.
voltage is not changed at all, at 1.296v..under load it is 60c

The best part? the H80 fan is not even max, just medium. Never tried max, i heard its crazy loud though.
.
Sure i could go higher, but its so easy just to change multiplier and be done with it.

x44-x45 seems to be the sweet spot for most 2500k-2600k chips (the one guy I know with a 2700k ended up with the same voltage as me but 100mhz lower to be stable so the stories I heard about them being higher binned turned out to be false or he got a dog of a chip) after that you start to get to the point where vcore has to be raised in larger and larger steps. Also over 4.5 I started to have to manually set and raise some other voltages such as VCCIO, CPU PLL and PCH

 

[Puppies04]

It is normal for temperatures to vary across cores, yes. This has happened to me with several processors.

Your temps look pretty good. What i've found is that exceeding 4.8ghz barrier or 1.4vcore on the sandy bridge raises temps a LOT, which you seem to have found as well At 1.35 vcore at 4.7ghz, my CPU doesn't exceed 55c in prime95 testing. At 1.47vcore @ 5ghz, it goes up 10-12c higher.

Quite right, my thrid core (C2) is constantly hotter than the other 3 cores under load, it is a well known issue although unless I have the wrong end of the stick your explanation of heat output is a bit off...

As I understood it raising VCore causes increased heat while raising your multiplier doesn't i.e running the same chip at 4.5 and 4.7 with the same vcore would put out the same amount of heat. The only reason chips get hotter as you run them faster is because the amount of VCore you have to pump through them goes up to keep them stable.

 

[TakeNoPrisoners]

Quite right, my thrid core (C2) is constantly hotter than the other 3 cores under load, it is a well known issue although unless I have the wrong end of the stick your explanation of heat output is a bit off...

As I understood it raising VCore causes increased heat while raising your multiplier doesn't i.e running the same chip at 4.5 and 4.7 with the same vcore would put out the same amount of heat. The only reason chips get hotter as you run them faster is because the amount of VCore you have to pump through them goes up to keep them stable.

I'm pretty sure the multiplier affects temps.

 

[BrightCandle]

The multiplier affects heat output as does the voltage. IIRC however the multiplier is a linear relationship where as voltage is a square relationship with heat output.