Came home today and it was 83 degrees in my room. 4 windows face the sun all afternoon. Not EVEN trying to play on the PC. Pretty much don't play on it at all anymore since the laptop handles it fine---but typically I don't game on the PC in the summer because the room gets so hot and the card simply gets too hot after a couple hours. It's a pretty common thing if your cooling may be marginal already.
As for checking the specs, you can get the particulars with a free tool from TechPowerUp called GPU-Z. It will tell you all kinds of details about your card. Here are some screen shots from their page:
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Then you can go to the manufacture's site (amd.com or nvidia.com) to look up your card, or you can google your card and the word "specs" (ie: "nvidia GTX 760 specs").
You will often find that third-party manufactured cards will have clocks set higher than what the original design called for, and that can create issues if they aren't adequately cooled or powered. The level of cards we use today need more dedicated power from the power supply than can be delivered through the motherboard, and most power supplies rarely ever deliver their full rated power out of the box (an 850W PSU may actually only provide a steady 650-700 under load, and that is split up across each set of plugs). Then they degrade over time and regulation gets worse as they heat up as well. As the environment becomes more harsh (heats up), things can degrade just enough for things to get flaky.
That is why we see problems crop up more often during the hotter seasons.
Edit: Oh, and I may have edited the first post after you originally replied... somehow chopped off part of it when editing before posting. Stupid phone. May want to check your Vsynch and Triple buffer settings. If the card is racing too far ahead of the monitor's refresh rate, you can sometimes get weird tearing and stuff.