I'm new to overclocking and gave it a shot today. I'm running an i7-4790k on an ASRock Z97 OC Formula. For cooling I have a Corsair H100i. Everything was going pretty well and just like it should according to the guides I followed. I decided to use 65C as a conservative temp limit, and 80C as an absolute max since I want this system to last a while and don't want to burn anything out.
I used three different programs to monitor CPU temps--HW Info, RealTemnp, and the Corsair Link dashboard. Under idle and small loads, temps are reasonable and around 25-35C. When I start stress testing pre-OC they go up to around 60C or so. I did this just as a baseline before an over clocking. The temps are generally stable and fluctuate only by about +/- 5C. When I started to tweak things and got above 4.5Ghz on the overclock, I noticed that the temps reached mid to high 60s. That's when it started to get weird. They would jump up to 80C and then immediately come back down to 60C in a matter of seconds. The stay there for a few more seconds and then jump back up and the cycle continues until the stress test is over. I pushed the OC to 4.6Ghz which seems pretty mild to me but I understand every chip is different. I had to increase the Vcore to 1.27V to get 20 passes complete with LinX and without errors. I decided to go up to 4.7Ghz and had to go up to 1.3V for the Vcore. I could get it to pass several times with LinX but my temps were jumping again--from about 60C up to 90C and them immediately back down. This would again repeat. I stopped the testing because I was worried about frying something.
I don't understand how temperature would be fluctuating by 30C+ in a matter of 1 or 2 seconds. should I be worried? Is this normal? I thought it might be the H100i pump mount interface and/or my thermal paste, but temps are relatively stable up to around 4.5Ghz which makes me think this isn't the case. I should also note that the core0 temp always seems to be a tad higher than other cores, even though I have synced them all in the bios. Thoughts?
Note - I have not been using small fft in Prime95 and have been mostly using LinX for now. Will this make a difference? I can't say I full understand but it seems that core temps may rise/fall quickly depending on load and that small fft keeps it more consistent. Is this what my issue is?
I used three different programs to monitor CPU temps--HW Info, RealTemnp, and the Corsair Link dashboard. Under idle and small loads, temps are reasonable and around 25-35C. When I start stress testing pre-OC they go up to around 60C or so. I did this just as a baseline before an over clocking. The temps are generally stable and fluctuate only by about +/- 5C. When I started to tweak things and got above 4.5Ghz on the overclock, I noticed that the temps reached mid to high 60s. That's when it started to get weird. They would jump up to 80C and then immediately come back down to 60C in a matter of seconds. The stay there for a few more seconds and then jump back up and the cycle continues until the stress test is over. I pushed the OC to 4.6Ghz which seems pretty mild to me but I understand every chip is different. I had to increase the Vcore to 1.27V to get 20 passes complete with LinX and without errors. I decided to go up to 4.7Ghz and had to go up to 1.3V for the Vcore. I could get it to pass several times with LinX but my temps were jumping again--from about 60C up to 90C and them immediately back down. This would again repeat. I stopped the testing because I was worried about frying something.
I don't understand how temperature would be fluctuating by 30C+ in a matter of 1 or 2 seconds. should I be worried? Is this normal? I thought it might be the H100i pump mount interface and/or my thermal paste, but temps are relatively stable up to around 4.5Ghz which makes me think this isn't the case. I should also note that the core0 temp always seems to be a tad higher than other cores, even though I have synced them all in the bios. Thoughts?
Note - I have not been using small fft in Prime95 and have been mostly using LinX for now. Will this make a difference? I can't say I full understand but it seems that core temps may rise/fall quickly depending on load and that small fft keeps it more consistent. Is this what my issue is?
