You probably see this a lot, but this is my first time posting anything here. So forgive me if this is in the wrong spot, and be gentle.
Anyway, I just recently bought and built a new computer. As someone who has up until now been almost exclusively on the console side of the wall, most of this stuff is new to me. Here are the specs for the components I bought:
CPU: AMD FX-8120 Zambezi 3.1GHz
Motherboard: GIGABYTE GA-970A-D3
RAM: G.SKILL Ripjaws X Series 8GB DDR3
GPU: GIGABYTE Radeon HD 7850 2GB
PSU: Diablotek UL Series 550W
So, now that that's out of the way, here's my problem. I was playing Tomb Raider with the settings maxed and it was looking fantastic. Really smooth frame rate, textures were all nice, etc. Then, about an hour in, the whole thing fell apart. I lost the video signal to the monitor and I heard a clipping noise in my headphones as if the last fraction of a second of the sound was looping over and over. I had to do a hard reboot to get everything going again. But then the weird part was, everything just fired right back up. I was able to jump right back in the game, and played for another hour or so, and the same thing happened. There was only cool air being blown out of all the box's exhaust ports (including the one on the video card itself) but I know that probably doesn't mean a whole lot.
I went looking around online and found out that the card is overclocked from the factory and that sometimes that causes problems. So I used the software that came with it and turned it back down. Still had the problem. Updated drivers, checked that the card and motherboard both had the most recent BIOS files (they do) and the problem persists. Then I had the notion that maybe it's not getting enough power, so I went looking at that. The video card calls for a minimum of a 500W psu. I have a 575W. But then the CPU saws that it has a Thermal Design Power of 125W. Reading up on that leads me to believe that this means it will use a max of 125W while it's being taxed heavily to run the fans enough to cool it. Basic math tells me that if the CPU and GPU are both using all the power they will use, that's 625W and more than the 575W my PSU is willing to offer.
So, my question for you fine folk is this: Does this sound like a different, more powerful PSU is the answer? Or is there something wrong with the video card? I don't really want to spend more money on a different PSU if I don't need it, and while I know a little bit about this stuff, I'm not confident enough to diagnose a problem without input.