Your initial post is misleading. The pictures show that your CPU is under the closed loop cooler, the Deepcool 120t but the post read out seems like you somehow got the closed loop cooler onto your GPU.
Concurrently, after looking at pictures of your system, you failed to mention the case's make and model but it's obvious it's not clean, the rear fan is dirty and the rear fan also looks like it's an 80mm fan. It also explains why the closed loop cooler is outside of your case alongside the PSU.
Instead of spending money on a much more expensive aftermarket cooler for the GPU, you should be looking at a new(current)case with proper airflow that accepts your components. In turn the airflow will help cool your GPU and the components within the chassis. As it stands there is no airflow reaching the GPU and whatever heat is being dumped by your GPU is being recycled which explains the high temps on your GPU.
You're located in India, correct? Why not just pick up a Coolermaster N200?
A slight mistake on your part with parts selection, why did you pick an i7-4790K and pair it with an H81 chipset board? You're already running on wasted potential. The right route to have taken was a Z97 board+DDR3-2133MHz rams. Speaking of rams, it's horrible practice to mix and match ram/sticks of ram. If you want more ram buy a kit and populate slots evenly.