2500k @5GHz 24/7

S

Sowexly

Gawd
Joined
Dec 4, 2011
Messages
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Well I was gonna wait for Ivy Bridge but I really wanna try out SB first :D

Anyway my build is:
Corsair 800D
Corsair H100
EVGA Z68 FTW
PCS+ 6970
8Gigs of Dominator GT (hoping for 2000MHz)
750W PC Power & Cooling (Silencer)
i5 2500k (hoping for 5GHz 24/7)


Now that we have that out of the way all of my parts should arrive on Friday and I was wondering how high my voltage should be for 24/7 operation and if others were able to get to 5GHz on similar setups.
 
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Don't "expect" an overclock, it just won't work out that way 9 times out of 10. Be happy with what you get. But alot of these chips (and others) can and will do 4.7 to 5 ghz with some tweaking. Personally my 2600K overclocks to 5 ghz stable 24/7 on air, actually 5.1 as well stable on air but I leave it at 5. You will most likely need 1.45v or more for 24/7 5 ghz and some tweaking as well, though there are really good binned ones that can hit that at slightly less voltage. It's rare though.
 
Yeah I know it will come down to my luck on the chip too and the air flow of my case (endless variables) I was just wondering if 5Ghz 24/7 was viable for lucky bastards.
 
Well like I said, my 2600k does it 24/7 4c/8t on air, so a 2500k with 4c/4t can definitely do it. I think it is a bit more common on the 2500ks, but again, not gauranteed.
 
I get to 5.0GHz on 2500k's all the time. However, you will need more than 1.9v CPU PLL Overvoltage and probably 1.45v CPU VCore or close to it. The Core i7 2500k's I've used wouldn't do that on air given the temperatures I see on water cooling with them.
 
Dan_D said:
I get to 5.0GHz on 2500k's all the time. However, you will need more than 1.9v CPU PLL Overvoltage and probably 1.45v CPU VCore or close to it. The Core i7 2500k's I've used wouldn't do that on air given the temperatures I see on water cooling with them.
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Sounds good the highest I wanted my voltage was 1.45 or so I definitively don't want to be @1.5v all the time.
 
Sowexly said:
Sounds good the highest I wanted my voltage was 1.45 or so I definitively don't want to be @1.5v all the time.
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The CPU can handle it. They are rated for 1.52v or something like that. The problem you will run into is heat.
 
What is the temp that is the cutoff point? Mine goes 45C at 4.4.
 
spaceman said:
What is the temp that is the cutoff point? Mine goes 45C at 4.4.
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Is that idle or under load?

They'll start throttling around 80c. Shut down temperature is around 95-100c I think. Ideally you want them to stay around 70c or lower under full load. I frequently get upwards of 78c when overclocking these things. These CPUs are funny. Up to about 4.4GHz or so they can pretty much use stock voltages or automatic settings and don't get much hotter than stock. Then as you increase their clock speeds by 100MHz or so they start getting hot fast. 100-200MHz often means the difference between 82c and 75c. .25v often means the difference between success and failure.
 
Idle sorry. I need to look at load.

I am running stock volts. I know they can handle the juice but my psu is a POS 650 watt (backup) and I have an oc'ed 480. So yeah, ok for now. Funny how fast they heat up. Must be some sort of friction issue.
 
spaceman said:
Idle sorry. I need to look at load.

I am running stock volts. I know they can handle the juice but my psu is a POS 650 watt (backup) and I have an oc'ed 480. So yeah, ok for now. Funny how fast they heat up. Must be some sort of friction issue.
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You probably aren't on stock voltage. The board is more than likely scaling the voltage up for you. Though it won't get too crazy doing so. I'd bet that you are close to 59c-65c or so under load.
 
Dan_D said:
I get to 5.0GHz on 2500k's all the time. However, you will need more than 1.9v CPU PLL Overvoltage and probably 1.45v CPU VCore or close to it. The Core i7 2500k's I've used wouldn't do that on air given the temperatures I see on water cooling with them.
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Core i5 2500k or i7 2600k?
 
Stoly said:
Core i5 2500k or i7 2600k?
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Core i5 2500k. I usually work with those. I've had very little time with the Core i7 2600k. The "i7 2500k" is a typo I'm constantly making for some reason.
 
ShuttleLuv said:
Tjmax on 2600k is 98C, thats when the throttle point begins.
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Tjunction max is different than the CPU's core temperature. I rarely see the TJunction max on monitoring software. I tend to use whatever the boards come with.
 
No gain moving from a 4.5 to 5 Ghz unless you are running benches 24/7. Maybe shave 2-5 seconds here or there on video encoding but that's about it.
 
KickAssCop said:
No gain moving from a 4.5 to 5 Ghz unless you are running benches 24/7. Maybe shave 2-5 seconds here or there on video encoding but that's about it.
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Yeah I figured I was just seeing if 5GHz was viable I mean I know plenty of people who are over 4.5GHz on these even if there aren't noticeable gains.
 
KickAssCop said:
No gain moving from a 4.5 to 5 Ghz unless you are running benches 24/7. Maybe shave 2-5 seconds here or there on video encoding but that's about it.
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It could come in handy with SLI in ultra-high end configurations. Not necessary otherwise.
 
Run 2600 at 4.6GHz... longer lifespan / minimal performance diff. Plus you can usually get there at stock volts.
 
SuperDank said:
Run 2600 at 4.6GHz... longer lifespan / minimal performance diff. Plus you can usually get there at stock volts.
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Most of the Core i5 and i7 CPUs I've worked with work great at stock voltages up to about 4.4GHz or 4.5GHz. 4.6GHz usually requires a slight bump. Not much, but a slight bump.
 
I'd say that 4.4 - 4.6 GHz is the weeet spot for 2500Ks. In games / real world performance you don't gain a whole lot by going to 5 GHz and you need a lot more voltage to get to 5 GHz than you will to the sweet spot range.

For what it's worth, my 2500K is a bit below average and gets 4.4 GHz on 1.315 vCore.
 
Sorry for the bump but I have my system up, running @5Ghz running Prime95 and the max temp I've seen so far is 79C (about an hour into the test while using my computer to browse the web and listen to tunes)

Vcore is @1.5v I think I could back down to 1.425-1.45

So what voltage and temps do you guys think are acceptable?
For 24/7 usage and/or benching.
 
4.8ghz


5ghz


Sometimes you get lucky. Here are my settings, maybe it will help you out abit. I recommend using offset to set the vcore.
 
Dan_D said:
The CPU can handle it. They are rated for 1.52v or something like that. The problem you will run into is heat.
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Thats a 1.52 VID.

canna said:
I'd say that 4.4 - 4.6 GHz is the weeet spot for 2500Ks. In games / real world performance you don't gain a whole lot by going to 5 GHz and you need a lot more voltage to get to 5 GHz than you will to the sweet spot range.

For what it's worth, my 2500K is a bit below average and gets 4.4 GHz on 1.315 vCore.
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I agree, I keep my chip at 4.6ghz. Anything more than that really starts needing more core voltage. The extra 8% core speed to hit 5hgz isn't worth the voltage, power draw, and heat imo.
 
Sowexly said:
Sorry for the bump but I have my system up, running @5Ghz running Prime95 and the max temp I've seen so far is 79C (about an hour into the test while using my computer to browse the web and listen to tunes)

Vcore is @1.5v I think I could back down to 1.425-1.45

So what voltage and temps do you guys think are acceptable?
For 24/7 usage and/or benching.
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As I've pointed out many times, according to Intel's own documentation on the matter, the Core i5/i7 LGA1155 CPUs can handle up to 1.52v VID voltage safely.
 
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Dan_D said:
As I've pointed out many times, according to Intel's own documentation on the matter, the Core i5/i7 LGA1155 CPUs can handle up to 1.52v VCore voltage safely.
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According to Intel's documentation its a 1.52v VID so its safe to assume that the max recommended vcore is a fair bit lower than that.
 
BababooeyHTJ said:
According to Intel's documentation its a 1.52v VID so its safe to assume that the max recommended vcore is a fair bit lower than that.
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I actually meant to say VID and ended up with VCore. I will say that I've had several Core i5 2500K's up to. 1.475v without any problems. Is that safe for 24/7 operation? I don't know for certain. I do know that on any CPU I've done that with, the CPU had to be water cooled and I don't mean with something like the Corsair H-series.
 
Dan_D said:
They'll start throttling around 80c. Shut down temperature is around 95-100c I think. Ideally you want them to stay around 70c or lower under full load. I frequently get upwards of 78c when overclocking these things.
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Are you sure about that? I was running my 2600k at 4.6Ghz with the autoOC feature and under full load it was topping around 101C before throttling and it definitely wasn't shutting down. When I adjusted a number of settings I was getting it down to 84C and I was not getting any throttling. I am pretty sure their throttling doesn't occur to 100C and it won't shut down til well over that. At least from my recent experience. But that is using CoreTemp to measure the temps. Are you using temp pads or something else?
 
NoOther said:
Are you sure about that? I was running my 2600k at 4.6Ghz with the autoOC feature and under full load it was topping around 101C before throttling and it definitely wasn't shutting down. When I adjusted a number of settings I was getting it down to 84C and I was not getting any throttling. I am pretty sure their throttling doesn't occur to 100C and it won't shut down til well over that. At least from my recent experience. But that is using CoreTemp to measure the temps. Are you using temp pads or something else?
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Well I've done this on a lot of boards. I've noticed that the throttling may occur earlier. Probably due to the motherboard doing it. I've seen throttling at 80c more than once.
 
Dan_D said:
Well I've done this on a lot of boards. I've noticed that the throttling may occur earlier. Probably due to the motherboard doing it. I've seen throttling at 80c more than once.
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Interesting, I have seen lot of people with i7 2500k or 2600ks with temps up over 80C with no throttling. I thought the throttling was a function of the CPU, not the MB?
 
NoOther said:
Interesting, I have seen lot of people with i7 2500k or 2600ks with temps up over 80C with no throttling. I thought the throttling was a function of the CPU, not the MB?
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There are temperature warning thresholds on the motherboard in the hardware monitor settings. This shouldn't by itself actually result in throttling. It may be that while my CPU temperature is only 80c, my TJunction temperature may be at 100c. Most of the motherboard utilities don't actually report anything but the CPU temperature. I had been using Core Temp, but I hadn't updated to a version which supports newer CPUs and chipsets. I should do that. I just hadn't given that any thought until now. One thing you should definitely keep in mind is that ASUS tends to report CPU temps about 10 degress C lower than they actually are. I don't know why, but this has been the case since the Slot 1 days if not earlier. I tend to work with more ASUS boards than anything else so my actual CPU temperatures could be 90-95+ degrees C.

Also, it has been my experience that I need to keep the load temperatures under 80c (according to ASUS' PC Probe II) or I often see stability issues while overclocking. If I can usually keep the load temps under 80c, I can hit nearly any speed. I won't say which one, but I was working with an X79 board recently and my temperature readings were hitting 80c and while it hadn't throttled, I was getting the audible temperature alarm consistently.
 
The distance to Tjmax is right on realtemp as the cpu temps rise, it states how close you are to throttling with the Tjmax.
 
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