Pc freezes while gaming

[rSPECTRUM]

In some games like GTA IV, BioShock, Splinter Cell Conviction, Sniper Ghost Warrior 2 my pc freezes after some time. My specs are the following: G3258 @ 4.5GHz, ASUS Z97-K, Sapphire R9 270 Dual-x OC 2GB , HyperX Blue 4GB DDR3 1600MHz, Seasonic S12II-430W Bronze, WD 1TB Caviar Blue. Now, I have the latest BIOS and GPU drivers, at first I thought it was the CPU but right now it's running with 1.325 v and I ran a lot of stress tests (aida, prime 95, ibt) and there were no problems but in gaming, as I said, my pc freezes and the display turns blue or red or brown with some white lines.. Is the GPU be the problem ?? How can I find where's the problem ? Also, I ran tests like 3D Mark, Ungine Valley and Heaven and everything was fine but in some games I get this problem.

This is what I get in Sniper Ghost Warrior 2 and GTA IV http://s29.postimg.org/nav9xpk5j/IMG752.jpg

And this is what I've got in AC Black Flag : http://s28.postimg.org/6esiqlwa5/IMG751.jpg

What should I do ? My gpu (like the rest of my components) is 2 months old.

 

[Roland Of Gilead]

have you tried running everything at stock to see if the problem is still there?

 

[NoAIm1337]

Sounds like a GPU. Does the case have good airflow? Are the fans moving on the GFX card? Maybe run a temp monitor for the GPU to see what it reaches.

 

[rSPECTRUM]

I haven't tried to run without OC, will do however. As for the GPU, the fans are moving and the temps are hitting 69 C in Ungine Heaven.

 

[Embra]

Take the OC off the cpu as well and see how it runs. Your PSU is a good make, but you may be pushing it with the OCing.

 

[rSPECTRUM]

Guys, I've run the AI Suite 3 auto tunning and it dropped the OC to 3.6 GHz and I've played like 1 hour of GTA IV and no freeze, everything is fine. So.. it was the OC ? But in stress tests everything was allright even at 4.5 GHz with 1.325v, am I missing something ?

 

[smeezekitty]

Is your GPU overclocked?

I had a brown screen crash like that a few hours in game when I overclocked my GPU too high

 

[rSPECTRUM]

It was but it's no longer and I've got these crashes when it was not.

 

[Embra]

I think you have found the range of your PSU. As I stated, a good brand and PSU, but on the edge of having enough power for your total system.