Tried Overclocking

[Ualaa]

I've got:

i5 2500K (was stock 3.3GHz), overclocked to 4.5GHz.
Asus P8Z68-VPRO.
Corsair A70, cooler.
8GB DDR3 Ram, 1600MHz.

I used these instructions:
Intel i5 2500k Overclocking Guide 4.5ghz settings. Asus P8P67. Air cooling. Stable. GLHF Computers - YouTube

For comparison, I ran the stress test before and after.
Both stress tests were 30 minutes long.
My idle has increased the temperature from 28c to 33c.
My Prime95 stress test has decreased the temperature from 80c to 72c.
It passes all of the IntelBurn Test V2 tests, before and after.

The only setting that I changed (that might account for cooler temps) was the Fan Controls.
They no longer scale with temperature, and are always on at 100%.
So, with the fans at 100%, the CPU is actually cooler during a stress test than before.

But the part I don't get...
Why would it be cooler under stress, but hotter while idle?

[Tim]

Holy cow, 72c under Prime95... that is really hot. While the CPU can reach in the 90s, those temps are still going to decrease the life and stability long term of the CPU quite a bit.

I'd aim for a maxed out CPU temp in the 50s.

I'm not sure I understand the question, since you are at 33c when idle, and 80c when under load, so it is higher when under load than when not?

Also for a reference, I have an 980X Extreme and at 4.6ghz it maxes out around 48*F averaged across all cores (the outer cores are around 43* last I checked). I typically don't run OC'd since I don't need it, and typically the most fragile area at high OC is going to be RAM, despite having ultra HQ Corsair Dominator.

My CPU is cooled with a ridiculously sized heat sink. Funny thing is, the FAN never worked on the heatsink the moment I got it, and only until 1 year later did I even notice. LOL

[Ualaa]

The Intel site says the chip is good to operate at up to 105c.

Five boxing warcraft, the temperatures are basically 50-55c.
From what I've seen on most of the overclocking sites or YouTube videos, 70-90c is fairly typical on air.

Honestly though:
a) If the chip lasts 2-3 years, I'll likely upgrade around then anyway; and
b) Anything I buy from my local computer store comes with a 4 year IPR plan, which means if it goes, I get a brand new version of the same thing or the next best thing by the same company for free. I specifically asked if the IPR covers an overclocked CPU, and have in writing that it does.



I ram the stress test twice.
Once before overclocking and once after.

The, while idle on the desktop temperature, is a few degrees hotter after the overclock.
The, under maximum stress testing temperature, is about 10 degrees cooler after the overclock.

I'd expect them both to be hotter, but with the overclock the CPU runs cooler under maximum stress than it did before the overclock.

[xunil76]

well, you stated that you changed the fan settings from automatic before the overclock to 100%, always-on after the overclock....i'd be willing to bet that's why it's running cooler after the overclock, because the automatic setting was likely not running the fan at 100%.

usually there will be a temperature threshold in the BIOS, which basically states "at x temp, i will turn the fan to y RPM's"....i'd be willing to bet that if you checked the temp setting for 80C, it's set to a lower RPM than the maximum.

setting it back to automatic may or may not work to see if that's what was causing it, because with it overclocked, it's going to reach a higher temperature, which could put it into a different RPM threshold for the fan speed, so it may still be cooler than before the overclock.

check your BIOS settings for the temp thresholds.