How to test my PC for any errors?

[G1K777]

Hello,

I'm using my fathers old computer and it has some weird freezes. I've swapped the ram around and the freezes keep happening.

 

It's not a normal freeze where everything freezes instantly, this is how I'm noticing that the freeze is on the way.

First, I'm unable to scroll and click on things, websites pages and I'm also unable to open the windows search (win key).

Then after some time, videos freeze but the sound keeps playing and after this, it just freezes for like a second or sometimes longer and then everything continues...

HW:
FX8320
GTX660(new installed gpu, 99.99% not it's fault, because happen with different GPUs.)

4x4GB RAM DDR3

Sandisk Ultra II 960GB

Gigabyte 970A DS3P

 

I did a full FTT prime95 test and no errors there (for about 9h, over night)

[RGProductions]

I had this issue, and it was a ram issue for me. Maybe try having all the ram be the same kit if it isn’t, or increasing ram voltage 

[G1K777]

2 hours ago, RGProductions said:

I had this issue, and it was a ram issue for me. Maybe try having all the ram be the same kit if it isn’t, or increasing ram voltage 

How high should the voltage be?