Debugging :: Random BSOD In Windows 8?

Recently I've experienced random BSOD's in Windows 8. Although my computer know-how is limited at best, I knew it was best to upgraded my pc in steps. The first week I installed a SSD (with a fresh install of Windows 8 on it) and ran without any problems. A week later I installed 16 gigs of (new) ram (with the SSD) and everything ran fine.

The problems started two weeks later. I haven't made any changes to my pc or driver upgrades since then. If I idle in windows everything works fine. The same is true when running Office or browsing the internet. BSOD's occur when:

- Playing games (modern or old), either after 5 minutes or after 3 hours (seems very random but frequent);

- When wathing a HD youtube movie (BSOD's when doing this seem very rare though);