What to do, to prevent overheating of Radeon HD 7770

[raddix1]

A week ago, everything was fine. Then one day I was playing the Assasins Creed 3 and after almost an hour of playing the monitor went black and the sound was coming and cpu was running. I restart the computer using the reset button.

Then this blackout becomes more frequent and now it happened after a minute at I starts the game. I thought that there was some problem with the game so I didn't give it much more importance.

After that, I tried to download a picture from http://canva.com and then again the monitor went black.

I formatted my system and installed a fresh Windows 8.1. After that I tried again to download the image but again the monitor went black. Then I read somewhere that this might be the issue of overheating.

So, I remove the side of the CPU and it worked I downloaded the image but its still not enough for the Assasins Creed or some other games.

Till Now I have Tried :
Installing new Windows
Removing the case of the CPU
Cleaning the CPU with the Air Blower
Running the GPU fan at 100% using AMD OverDrive

But still the problem is there.

My configuration is:
Intel Core Processor i7 - 2600
2 * 4GB DDR3 RAM
Hard Disk - Kingston 1TB
Mother Board - Intel DH61WW
GPU - Radeon HD 7770
PSU - 500W
Monitor - Samsung SA300N

I tested it using the FurMark and for the 640*360 resolution, it showing that the temperature is 60*

My room does not have an AC so I want to know any alternate solution to prevent overheating.

Can you please suggest something to prevent this overheating.

 

[coolcole01]

two options first remove the heatsink and reapply thermal paste it can really help second get a small case fan and point it directly at the gpu from the side

 

[raddix1]

Sounds like a failing GPU do you have a old one to swap in?

No, I don't have one but can you suggest any symptoms of failing GPU and what I have to do if that's the case.

 

[raddix1]

two options first remove the heatsink and reapply thermal paste it can really help second get a small case fan and point it directly at the gpu from the side

With thermal paste, I am also thinking of using a water cooling kit. Will that be good to maintain the tempearture.

 

[coozie7]

You don't need to WC a HD7770.
Download and install HWInfo and check all the temperatures, it could be the CPU or even chipset coolers are allowing parts to overheat.

What do you mean by "remove the case of the CPU?"