I built my new rig 3 weeks ago and I have very low temps. I run a Haswell i7 4770K and a Cooler master 212 EVO, so my idle temp. is 20-25 and when its load doesn't go above 35,so I decided to make a small oc to 4,2Ghz and I got just +2 Celsius in both idle and load (22-27 and 37). Also after running prime95 for 3 hours max temp was 55C. is there a possibility that my sensor is reading bad temps? Cause it seems very low as I read that most of ppl have high temps with the cpu.
Ambient or room temp also plays in, if in a cool room it helps keep temps down, but sounds like you have a good chip, throw another temp monitoring program on there to take a look at what it shows, something like CoreTemp (free)
Well than yea the numbers don't add up. If the room is 25c and your monitoring software is showing a temperature range of 20-25c it can't possibly be correct. The CPU can't be cooler than the air in the room.
I put the thermometer in my case and after 15 minutes the temperature was 22c, I think that it doesn't really affect the cpu temperature my room temperature (looks like the front fan of my case is doing quite a job). Is there any other way through my system to check if cpu temp is ok or there is a problem with the sensor?
I think your probably ok. I have the 4770k in a Haf X case and have been running the stock Intel fan for the past 2 weeks with prime95 max temps at 85 to 90c. Yesterday I switched to the Noctua NH-U12S 120mm fan, and now running prime95, max CPU temps are around 45c. At idle, with the stock fan, i was around 40 to 45c. With the Noctua, i am now between 20 and 25c. Mind you I am not oc, but obviously my sensors are reading correct with such a big difference in readings between the two fans. So to me it doesn't sound impossible, because It sounds like you are relatively close to my readings. I use SpeedFan and AI Suite 3 to monitor my temps, and there is roughly a 3 to 5c difference between the two programs. I plan to oc to around 4,2g in the next couple days, and will let you know what my readings are if you want.