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Corsair h100 inferior to an A70? - help needed

post #1 of 10
Thread Starter 
Hi there, I'm new to the forum so I thought best I'd get the pleasantries out of the way first!

I'm from the UK and after saving for a while, I recently put together the following set-up;

P8Z68V PRO
2600K
H100
16GB of Vengeance RAM
2x GTX 580s in SLI
AX1200 PSU

Now I'm here essentially as I'm having a few minor issues with relation to overclocking. A few weeks ago I managed to run my CPU at 4.7 ghz for two hours at 1.370 volts under a stress test, and I've had that as my manual overclock until recently.

For the original test I used the AID64 stress test and it didn't fail, I simply brought it to a close and tried to go for a higher clock speed.

After a few attempts at 4.9 and then 4.8 and a collection of BSODs I settled for the original 4.7 at 1.370 volts.

Now though, I'm having problems with the CPU, I've been getting BSODs while running video games, and it no longer manages the stress test at the aforementioned figures.

I bumped it up to 1.375 and it still failed after a short while, could anyone point towards why it no longer seems comfortable at that voltage and clockspeed? I'm going to run 1.380 later, but nonetheless it's frustrating that the goalposts seem to have been moved for no apparent reason.

Does anyone with more experience than myself know what is the issue there?

Also, slightly related, when I first put the rig together I ran the CPU with a Corsair A70 heatsink. At the 4.7 ghz by 1.370 volts I mentioned previously I was getting temperatures of between mid 50s to very early 60s. There was very little fluctuation, and it seemed consistent, it was a very good stable temperature.

By virtue of the A70 being unable to fit in my Cosmos S with the side panel closed, I bought a H100 to replace it.

I expected a small decrease in temperatures, but running the same AID64 stress test at now 1.375 volts (as the 1.370 fails almost immediately) and 4.7 ghz, I'm seeing temperatures that are in fact higher than the A70's and a much greater discrepancy between the highest temps and the lowest. The temps can briefly reach the low 50s and then pop up to 63 or 64 degrees, and they continue to do so during the duration of the test so the graph develops a zig zag effect. The average is probably around 59-62, but the fluctuation is puzzling.

Could anyone provide an explanation for this? What temperatures should I be expecting to see? And is it just a possibility of it being poorly fitted to the CPU? I used AS5 thermal paste and spread it out evenly with a card on the processor, although I may have used too much, I don't know - could that be a possibility?

Thank you for any help. Also any tips and help to reach a stable overclock would be greatly appreciated, as I'm a relative newbie in this respect.

Cheers.
post #2 of 10
Thread Starter 
Just for to add, the above is a quote from myself which I posted in another forum yesterday, but I've brought my problems over here too in the hope that I'll get the help I need!

Just a quick update as of just earlier today;

I'm currently running a stress test at 4.7 ghz and have been doing so for approaching 50 minutes at 1.375 volts. And there have been no issues. Really puzzling, I tried this numerous times before, yesterday no less, and it failed fairly quickly. Could someone explain this?

Also here is a graph of my temps running the current stress test;



Notice how the temps are all over the place. Some cores drop to 50, while others spike up to 64. And it's consistently spiking, rising and falling . Also note that this room is around 2, maybe 3, degrees cooler than usual.

Can anyone explain what's going on here?

Thanks.

Any help would be greatly appreciated.
post #3 of 10
Uneven core temps usually points towards your tightening being uneven. Unseat and re-seat your heatsink. Also double check your thermal compound application, etc.

As far as your OC goes, this is reasonably normal. Heavy OCing a CPU when you first get it, means you'll have to give it a voltage bump later on once the CPU "breaks in." This first big degredation is normal, it happens frequently with new OCs that weren't burned in initially.

Running 2 hours stable doesn't mean it's stable. Leave it running "Small FFDs" under torture testing for 24 hours in Prime95. This is the 2nd heaviest load you'll be able to put on a CPU and only running it for a long time is a sure way to assure stability.
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post #4 of 10
Thread Starter 
Just another quick update, I'm still running the stress test (which I mentioned previously), here are the current temps;



Min Max Avg
Core 1: 30 61 54.7
Core 2: 30 64 58.3
Core 3: 27 63 55.1
Core 4: 33 63 56.6

Also, remember that the room in which the testing is occurring is cooler by around 2 or 3 degrees than it is usually.

Thanks for any help.
Edited by Rocky Graziano - 10/28/11 at 7:10am
post #5 of 10
Thread Starter 
Quote:
Originally Posted by CTRLurself [Knyte Custom] View Post
Uneven core temps usually points towards your tightening being uneven. Unseat and re-seat your heatsink. Also double check your thermal compound application, etc.

As far as your OC goes, this is reasonably normal. Heavy OCing a CPU when you first get it, means you'll have to give it a voltage bump later on once the CPU "breaks in." This first big degredation is normal, it happens frequently with new OCs that weren't burned in initially.

Running 2 hours stable doesn't mean it's stable. Leave it running "Small FFDs" under torture testing for 24 hours in Prime95. This is the 2nd heaviest load you'll be able to put on a CPU and only running it for a long time is a sure way to assure stability.
Thanks for the reply.

By virtue of what you've just told me, could I possibly have degraded my new CPU further than most do usually by attempting to overclock too high initially rather than taking small incremental steps?

I'll examine the heatsink placement shortly, if it is tightened unevenly, could I just tighten a few screws to compensate - or does it have to be removed?

Do the stress tests look normal or abnormal to you, looking at the pictures included? The spikes and the drops?

Or am I showing myself as a bit of a noob here?

Finally, do you know, or anyone else for that matter, what temps I should be expecting with the H100 running with a push/exhaust set-up and with the processor and voltage considered?

Oh, and any tips for reaching a stable and fair overclock for my 2600k?

Cheers.
Edited by Rocky Graziano - 10/28/11 at 7:12am
post #6 of 10
Thread Starter 
I've just stopped the AID 64 stress test after 3 hours and it ran fine. Puzzling as it failed yesterday.

But another query I have is why is the CPUID currently displaying the vcore as 1.384v now I'm at idle and the clock speed is at its idle 1.6 ghz?

The vcore I set in the BIOS was actually 1.375 as well.

Is this an error, or is the CPUID correct? And if so, how do I change it to drop to a lower voltage while running in idle?

Thanks for any help.
Edited by Rocky Graziano - 10/28/11 at 8:25am
post #7 of 10
Quote:
Originally Posted by Rocky Graziano View Post
By virtue of what you've just told me, could I possibly have degraded my new CPU further than most do usually by attempting to overclock too high initially rather than taking small incremental steps?
No. A CPU will always degrade over time. The higher the OC, the faster it degrades over it's life. That's why people say "overclocking shortens the life of your equipment."

With new CPUs there is usually an initial big step of degredation, and it may need another bump in about 6 months to 1 year and then it should be good until it dies. This is normal, it's just all about the luck of the draw with your CPU for how big, and how quick those bumps happen.

Quote:
Originally Posted by Rocky Graziano View Post
I'll examine the heatsink placement shortly, if it is tightened unevenly, could I just tighten a few screws to compensate - or does it have to be removed?
Those temps aren't very uneven. If they're within a couple degrees (which they are) then you're fine. The diodes that actually give you a temp aren't super-accurate to begin with.

Quote:
Originally Posted by Rocky Graziano View Post
Do the stress tests look normal or abnormal to you, looking at the pictures included? The spikes and the drops?

Or am I showing myself as a bit of a noob here?
That's because the CPU reports temps in whole degrees partly and also because I don't know how good that stress test actually loads the CPU. It may be inconsistant work load causing it to heat/cool some before it get's loaded again. Stick to either Prime95 or IBT for stress testing your OC as they are pretty well established as "the stress test" that everybody is familiar with, and knows well.

Quote:
Originally Posted by Rocky Graziano View Post
Finally, do you know, or anyone else for that matter, what temps I should be expecting with the H100 running with a push/exhaust set-up and with the processor and voltage considered?
Nobody can tell you exactly what temps to expect, especially if you never tell us what your ambient temps are. Assuming you're in a 30C ambient room your temps look about right.
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post #8 of 10
Just a simple post to get "CTRLurself [Knyte Custom]" crazy long name from jacking up the forum alignment! /shakefist
 
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post #9 of 10
Thread Starter 
So I was fussing about nothing then essentially with regards to the fluctuations in the temps?

It's frustrating though, the room was cool when I ran the test, chilly even, and there was no improvement on the A70.

It must be the paste or the fitting.

You mention the CPU dying after a while, what sort of time frame would that be, usually?

Also, I'd appreciate it if someone could talk me through how to keep my idle vcore low and to only bump up only when necessary.

Thanks.
post #10 of 10
The time frame varies, but it's usually several years, even with heavy overclocks. As with any electronics, it's impossible to say when exactly. Could be tomorrow, could be never

Also remember that the temperature sensors a Sandy Bridge CPU are not a true thermometer of sorts, or even a thermal diode for that matter. I don't recall exactly what it does, and most of it is trade secret, but it uses varying voltage/resistance/inductance to determine the temperature of a core.
 
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