PC Crash With Artifacts

So 3 weeks ago my gtx560 died and i had to replace it. I bought gtx 750ti and everything seemed fine. but 1 week ago my pc started crashing 1-2 time a day while surfing on the internet or doing something else (no blue screen just weird sound and visual artifacts like this

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After restart freeze and visual artifacts are gone but not forever.

I tried updating my drivers and cleaning gpu but still same.

I want to know is my gpu dead (dieing) ? thanks.

My card has warranty so i think i will be able to replace it. But first i want to know if my gpu has problem.

1 week ago i updated my drivers from GTA V game ready driver to newer one and after 2 days pc started crashing as i said. Then i switched it back to previous version as i thought that was a problem but no result crashing kept going. PC crashed 5 times so far 1 time in witcher 3 and 4 times while surfing on the internet or doing something on desktop. so i don't think GPU overheat is a problem here.

When first GPU gtx560 died i was not able to even run windows as i had artifacts all over BIOS. So i am wondering if something similar is going to happen this time.

PC Specs: 8 gb ram i7 2600k windows 8.1 x64 no idea about motherboard or power supply but i believe they are ok but mayebe i am wrong.

My gtx750ti is overclocked by default as its box has text gtx750ti OC.

Artifacts on screen use to come from hardware issues, rather than software ones. Very often they correspond with VRAM malfunctioning.

Overheating could be the origin of the problem. Check it with AIDA64 (Extreme version is good for you, 30 day trial available) at Computer --> Sensor option.

In order to find a clear way to reproduce the error (if you want to send the card to technical service), try the Stability Test inside AIDA64 at Tools --> Stability Test.

Other possibilities:
- Some burned chips or circuits on the card (up or down, check both sides) - Cooler not contacting OK with some VRAM chip. Remove, check thermal pads, and mount again.