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2500k @ 4.8GHz (1.328V) already throttling at 70 degrees? [Solved]

post #1 of 29
Thread Starter 
Hello everyone!

Got my sandy chip today accompanied with Asrock Z77 Pro3 and stuff.

I've been testing to overclock this bad boy for the last two hours now, but now I stumbled upon a weird problem. While running Prime95, and temps hitting 68-70'C, the multiplier drops to 33 (3300MHz) for a second or so (temps go to 56-58'C). After that it goes up to 4800MHz again (temps to 70'C too) and the same cycle is repeated. Just jumping back and forth.

I've read that the throttling should begin somewhere in the range of 90'C, not 70'C. redface.gif

Anyone know why this is?
Edited by solkku - 4/25/12 at 5:56am
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post #2 of 29
Quote:
Originally Posted by solkku View Post

Hello everyone!
Got my sandy chip today accompanied with Asrock Z77 Pro3 and stuff.
I've been testing to overclock this bad boy for the last two hours now, but now I stumbled upon a weird problem. While running Prime95, and temps hitting 68-70'C, the multiplier drops to 33 (3300MHz) for a second or so (temps go to 56-58'C). After that it goes up to 4800MHz again (temps to 70'C too) and the same cycle is repeated. Just jumping back and forth.
I've read that the throttling should begin somewhere in the range of 90'C, not 70'C. redface.gif
Anyone know why this is?

have you checked your bios settings? a lot of bios's let you set the temperature at which you want the cpu to throttle. sorry if that's painfully obvious but it's the first thing i'd check...

edit: also prime95 does have little stages where it's not loading the cpu quite so hard. i've never actually paid attention to whether mine drops down briefly but it could just be that.
post #3 of 29
Thread Starter 
Quote:
Originally Posted by ET900 View Post

have you checked your bios settings? a lot of bios's let you set the temperature at which you want the cpu to throttle. sorry if that's painfully obvious but it's the first thing i'd check...
edit: also prime95 does have little stages where it's not loading the cpu quite so hard. i've never actually paid attention to whether mine drops down briefly but it could just be that.

No, nothing there. There's only the "overheat protection" enabled/disabled.. which I have set to default (enabled).

IntelBurnTest makes the CPU hit 74'C according to RealTemp, HWMonitor and AXTU, and it didn't throttle down. So I guess it's as you said, that Prime95 just isn't using 100% of the CPU all the time. Phew!

Man, I wish I had a better motherboard. I think I'm pushing the limit of this Z77 Pro3's 4+1 power phase at 4.8Ghz. I tried setting the multiplier to 50, but it just wouldn't go to Windows. I get the 0124 BSOD, which I think means you have to increase your vcore. So I tried increasing it in steps (from +0.045V where I'm at @ 4.8GHz) all the way up to +0.085V. But still no luck, so I thought it wasn't worth it.

4.8GHz seems to be the sweet spot, but will still try to lower the vcore from 1.328V. It's a shame that I really can't tell if it's the mobo or the CPU that is holding me back from 5GHz. thumbsdownsmileyanim.gif

Edit: Btw, I'm using a cheapo Arctic Cooling Freezer 13 PRO cooler too. =)
Edited by solkku - 4/23/12 at 4:14pm
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post #4 of 29
I'm stable running 46x100 @ 1.4v, no throttling in the 70s. The max is around 99C I believe, that's when you'll see throttle.

Also your temps are high for that low of voltage... what cooler are you using?

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post #5 of 29
Z77 Pro3 uses a 4+1+1 analog-digital hybrid VRM setup. It is geared toward moderate overclock. It is very likely that VRMs are getting too hot that the hardware protection circuit kicks in. Make sure there is a fan spinning next to the VRM heatsink, preferably blowing on to the VRM heatsink. Also make sure you case has optimal airflow, and good cable management.

Also temperature are getting hotter recently.
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post #6 of 29
Quote:
Originally Posted by solkku View Post

No, nothing there. There's only the "overheat protection" enabled/disabled.. which I have set to default (enabled).
IntelBurnTest makes the CPU hit 74'C according to RealTemp, HWMonitor and AXTU, and it didn't throttle down. So I guess it's as you said, that Prime95 just isn't using 100% of the CPU all the time. Phew!
Man, I wish I had a better motherboard. I think I'm pushing the limit of this Z77 Pro3's 4+1 power phase at 4.8Ghz. I tried setting the multiplier to 50, but it just wouldn't go to Windows. I get the 0124 BSOD, which I think means you have to increase your vcore. So I tried increasing it in steps (from +0.045V where I'm at @ 4.8GHz) all the way up to +0.085V. But still no luck, so I thought it wasn't worth it.
4.8GHz seems to be the sweet spot, but will still try to lower the vcore from 1.328V. It's a shame that I really can't tell if it's the mobo or the CPU that is holding me back from 5GHz. thumbsdownsmileyanim.gif
Edit: Btw, I'm using a cheapo Arctic Cooling Freezer 13 PRO cooler too. =)

Well what settings are you running IBT on? Becuase if you're running it on a high setting and using up loads of RAM then it causes things to freeze. So you might not be seeing the clock speed drop down if CPU-Z or whatever software you're using keeps freezing because of IBT...
post #7 of 29
Thread Starter 
Quote:
Originally Posted by trumpet-205 View Post

Z77 Pro3 uses a 4+1+1 analog-digital hybrid VRM setup. It is geared toward moderate overclock. It is very likely that VRMs are getting too hot that the hardware protection circuit kicks in. Make sure there is a fan spinning next to the VRM heatsink, preferably blowing on to the VRM heatsink. Also make sure you case has optimal airflow, and good cable management.
Also temperature are getting hotter recently.

So you'd say that with a better motherboard I could reach +5GHz? It's fair t say that I'm quite new to sandy bridges and how they react when overclocking. I've done a bit of research, but still unsure about certain things. Like for example, do they ask for more power (0124 BSOD) when you are at the chip's limit, or is there usually another BSOD?

I think I'm just going to lower it down to 4.5GHz to be on the safe side. I mean, 300MHz isn't really going to make a huge difference anyway and I don't want to risk frying the power phase on the mobo.

I actually have a fan blowing around the CPU socket, from under my Arctic Cooling Freezer 13 Pro cooler:
Look at bottom right illustration of the page
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post #8 of 29
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Quote:
Originally Posted by ET900 View Post

Well what settings are you running IBT on? Becuase if you're running it on a high setting and using up loads of RAM then it causes things to freeze. So you might not be seeing the clock speed drop down if CPU-Z or whatever software you're using keeps freezing because of IBT...

I ran it on standard at first, then switched to high in order to reach over 70'C.
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post #9 of 29
Setting core current to 250 in the bios should fix your problem.

Edit: Also 101 bsod is usually what I get when my CPU needs more volts, 124 can be more or less vcore or more voltage to the VCCIO among other things.
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post #10 of 29
Quote:
Originally Posted by solkku View Post

So you'd say that with a better motherboard I could reach +5GHz? It's fair t say that I'm quite new to sandy bridges and how they react when overclocking. I've done a bit of research, but still unsure about certain things. Like for example, do they ask for more power (0124 BSOD) when you are at the chip's limit, or is there usually another BSOD?
I think I'm just going to lower it down to 4.5GHz to be on the safe side. I mean, 300MHz isn't really going to make a huge difference anyway and I don't want to risk frying the power phase on the mobo.
I actually have a fan blowing around the CPU socket, from under my Arctic Cooling Freezer 13 Pro cooler:
Look at bottom right illustration of the page

That mini fan below Freezer 13 Pro isn't enough to keep the surrounding VRM cool. Get a fan to cool those VRMs.

Throttling has more to do with motherboard than to do with CPU. With better motherboard, you can go further before motherboard couldn't take it. You still haven't hit the limit on your CPU, so it is hard to say just how high you can go.
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