|Intel Sandy Bridge Overclocking Guide|
|Articles - Featured Guides|
|Written by Servando Silva|
|Wednesday, 20 April 2011|
Page 9 of 10
Overclock vs. TemperaturesHeat is one of the main concerns when overclocking. Some people think they could fry their CPU because of the heat, and that scares them. However, this is far from reality. CPUs and motherboards are so protected that it is almost impossible to burn a CPU by heating it that much. It would be easier to fry your CPU by short circuiting or adding extreme voltage values, but heat isn't normally a problem as components tend to shut down when passing off their limits. However, even if heat isn't that dangerous, it's removal is key for higher and stable overclocks, and that's why Benchmark Reviews covers a lot of CPU heatsinks in our articles. In my tests, I used Noctua's NH-D14 heatsink paired with 2 x NF-P14 140mm fans. Most people won't have this kind of cooling, but the Prolimatech Megahalems or Thermalright Venomous-X should be able to get similar results. Anyway, if you're really aiming at maximum frequencies, you'll need to buy a decent heatsink. If you're stuck with Intel's stock cooler or something similar, chances are that you won't be able to stabilize anything above 1.2-1.3 volts. In this case, I included full load (Prime95 FTT Test) results and idle numbers too.
At idle mode my Core i7 seems to be colder than the Core i5 processor. Only when increasing voltage and CPU frequency, the Core i7 rises up its temperature to the point where it matches the Core i5 temperature. This is however a non-important case as they're both at idle mode. The real deal will appear in the next chart after I make them pass 30 minutes of Prime95 FTT test:
At stock frequencies both CPUs are quite cold. They don't even reach 50 degrees, which is great for any PC. At this point the Core i7 is colder than the Core i5, which seems natural after watching the CPU power consumption charts. At 4GHz the temperature raised to 51 degrees for both processors. At 4.4GHz the Core i7 2600K raised its temperature to 59 degrees while the Core i5 2500K reached 57 degrees probably because it's got less thread and cache. Finally, at 4.8GHz the Core i5 reached 67 degrees and the i7 reached 74 degrees. Remember that limit between 70-80 degrees? That means we shouldn't put any extra voltage to the Core i7, while the Core i5 still has got a little gap to test. Anyway, it's always better to keep your CPU below 70 degrees.