FPS and temps drop

[Anonymous081295]

So when im playing dota2 my gpu would give me around 120-140 fps with temps upto 80 degrees but after sometime fps would suddenly go down to 30-40 fps and temps would go down to 60 degrees and remain constant at that temp. GPU usage stays at 100% the entire time during gaming. The game hangs for 2-3 seconds before the fps drop happens. Monitored this using MSI Afterburner

CPU - intel i7 4770k
GPU- AMD HD7850
OS- Windows 10 Pro 64 Bit

 

[Anonymous081295]

bump