Where should i mount my radiator?

[GiantCow]

i have corsair carbide 500r and a corsair h80i but i dont know which is better. Mounting the radiator in the front or the top of the case. Please can someone tell me which one has better performance

 

[manofchalk]

I dont think the tubes are even long enough to mount it at the front.
Mount it at the back.

 

[Meng2strong]

Back will be the best option in terms of fitting other components in.