Well, a couple days ago, my GPU decided to divorce my monitor, rendering my entire computer useless. So, today, I removed the problem processor, and - hey, presto! - the computer is fine! So, I Googled the card. Boy, was I in for a shock. The processor runs on GDDR5 memory (whatever that means) - which is unfortunate, because my motherboard runs DDR3. So, for about two and a half years, I've been running my computer with incompatible hardware! Total Jean-Luc double facepalm moment!
At least the rest of the beast still works.