We all know that electronics get hot, the only way of telling how hot they really are is my measuring their temperature and one of these methods is by using a Thermal Camera and as these images show, the result is quite impressive:
The first image shows the console in a vertical position, having and the firmware updated:
The second image shows the PS4 in a vertical position, after being on for 30 minutes and playing Killzone:
The third and fourth images, shows the PS4 in a horizontal position, with 20 minutes of Killzone gameplay between
Source/More Images
Thanks Euss 
11-18-2013
12:52 PM
In the left corner is the temperature in Celsius, right?.
11-18-2013
01:21 PM
Fahrenheit,, hellsing9 xD
Fahrenheit to Celsius Converter
I would like to invite everyone to http://www.psdevwiki.com/ps4/Main_Page to contribute, together, we can!
11-18-2013
02:38 PM
All i see in this pic is:
Upper left = Temperature in Fahrenheit.
Upper right = 94.4?...frames x second...clueless about this.
Bottom right = Where i mistaken with Celsius, idk what's those represent.
Thanks for the converter.
http://www.psdevwiki.com/ps4/Main_Page Time to add some info to the wiki. There's a talk page about Blue light of death?..
11-18-2013
03:25 PM
actually that is the range of temperature in the picture, the number on the left-top is where the crosshair is pointed on.
http://www.psdevwiki.com/ps4/Indicator_Lights
http://www.psdevwiki.com/ps4/Talk:Indicator_Lights
http://www.psdevwiki.com/ps4/Safe_Mode
11-18-2013
11:18 PM
How hot did the ps3 slim get up to in comparison
11-18-2013
11:38 PM
65C is not for a first gen system. now compare that to xbox
11-19-2013
01:39 AM
Hrm... interesting data but fairly useless without an accurate read on the room's air temp too.
11-19-2013
02:44 AM
Well thise temperatures looks good couse PS4 run at silent fan mode, I bet if you can and you do 50% fan speed temp in gaming would be like 120F. Compare that to my slim idle 145F with new as5 under ihs and in gaming 165F with sony fan.
But did they say that PS4 work temp will be 30c LoL and he only cold boot at 30 like my PS3 but later get hot.
11-19-2013
12:34 PM
So should we keep our PS4 in horizontal mode just like the PS3?
11-20-2013
01:29 AM
141 Fahrenheit is 60 degrees Celsius. 131 Fahrenheit is 50 degrees Celsius.
So all things considered, it runs pretty cool and quiet. Mine is very quiet, but I also keep it horizontal. Putting your hand on top, it feels hotter to the touch than the 60GB PS3 or Xbox 360, but that's because of the design and thinness of the case. Overall very solid quality from Sony.
Love that it's beeps sound exactly like the PS3. =D