Should air from an exhaust fan be cool during CPU stress test?

[td25er]

I ran Prime95 test on my 4770k and CPU temps went over 90c but the air coming out of the rear exhaust didn't feel noticeably warmer.

My Powercolor r9 290 reached 75c during Furmark and I could notice warmer air out of the rear exhaust.

Does this mean something is wrong with my stock cpu Heatsink/fan or my installation? Should I feel warm air with such high cpu temps?

Thanks.

 

[BonzaiDuck]

I ran Prime95 test on my 4770k and CPU temps went over 90c but the air coming out of the rear exhaust didn't feel noticeably warmer.

My Powercolor r9 290 reached 75c during Furmark and I could notice warmer air out of the rear exhaust.

Does this mean something is wrong with my stock cpu Heatsink/fan or my installation? Should I feel warm air with such high cpu temps?

Thanks.

The problem with the stock HSF of Intel: It forces case-air down on the heatsink and blows it back into the case "air reservoir." So it's more likely that case exhaust air might not seem warmer.

With an aftermarket cooler like the CM Hyper 212+ or EVO, the case interior air is blown through the fins and should most likely exit the opposite side facing the exhaust fan. In which case, warmer air is more noticeable. It is especially more noticeable if you duct the rear of such a cooler to the interior side of the exhaust fan. That's just a more efficient way of cooling the CPU and assuring that HSF exhaust air isn't continually mixed with the case interior before "eventually" being exhausted.

I'd still -- especially -- check the mounts on the stock cooler. The little push-pins need to be secured, and many people seem to have trouble with the installation. That's about all I can say in the matter.

 

[td25er]

The problem with the stock HSF of Intel: It forces case-air down on the heatsink and blows it back into the case "air reservoir." So it's more likely that case exhaust air might not seem warmer.

With an aftermarket cooler like the CM Hyper 212+ or EVO, the case interior air is blown through the fins and should most likely exit the opposite side facing the exhaust fan. In which case, warmer air is more noticeable. It is especially more noticeable if you duct the rear of such a cooler to the interior side of the exhaust fan. That's just a more efficient way of cooling the CPU and assuring that HSF exhaust air isn't continually mixed with the case interior before "eventually" being exhausted.

I'd still -- especially -- check the mounts on the stock cooler. The little push-pins need to be secured, and many people seem to have trouble with the installation. That's about all I can say in the matter.

Thanks, BD. I actually installed a 212 Evo tonight and my temps are below 70 with fans on full speed with turbo mode off. Thus is (since Saturday) literally the 1st time in my life I've even seen the inside of a computer so I probably jumped in over my head getting "enthusiast" parts when I have trouble mounting a Heatsink (the 212 Evo was frustrating too, lol).

 

[Essence_of_War]

Heh, I actually found the mounting of the Evo to be non-trivial my first time also 🙂

 

[aigomorla]

well this question is highly debatable.

for you to notice hot air, the air would need to be above body temp.
Body temp on average being 37C on average, would mean the air expelled would have to be greater.

Now assuming the efficiency of the heat sink along with the IHS transfering heat to the heat sink... the overall temps would probably need to be near double the value for a required X time factor.

So your talking about a load cpu temp of about 70C+ for it to expell significant warm air out the rear.

Then factor in the time it takes to saturate the warm air inside the case's ambient... and well... as i said it can get very long and wordy to tell you that not all the time will you feel warm air being expelled from the rear of your case.

Now if u had a Monster gpu like a 780GTX Ti, well, that would also change everything as the time required to saturate your case with warm air would rise significantly faster.