PC keeps freezing/having lag spikes/stuttering/blacks out

AngelBerry

Prominent
May 24, 2017
1
0
510
Ever since I got my computer back in November 2016, I've been getting lag spikes/stuttering and my computer would keep freezing. It only recently became more frequent, but it would happen back then as well. I also recently got a black out that lasted a few seconds while playing a game called Osu. The lag spikes also last a few seconds, and when my computer freezes, it doesn't come back no matter how long I wait and if there was audio then the sound would just stutter over and over until I power off my computer. Since I basically only play Osu, I've only experienced these things in Osu and also when I'm just browsing the internet or just idle, but my brother also has them in other games he plays like Paladins. I've asked some of my friends and they think it's because of my graphics card, but I'm not good with computers so I don't know. This PC was a custom build from PC Specialist. I've been getting less freezes now but definitely more lag spikes/stuttering. In about a week I'll be in a tournament for Osu, and a lag spike would be fatal for any rhythm game so I want to fix it as soon as possible. Anyone know how to fix this?

PC specs
http://imgur.com/mpMX7bJ