Which is more likely to ruin a computer's graphic card?

Playing a heavy game like the Sims 2 lots of hours a day



OR



viewing multiple web pages at the same time (like online newspapers and online games and puzzles)?



Is there anything that is actually guaranteed to ruin your graphic card?Which is more likely to ruin a computer's graphic card?
I've had the same card for over a year, and do heavy gaming. No problems here. In the past, I've actually had my card melt from playing games (That's why the pricey ones come with fans, to keep it from heating up.)Which is more likely to ruin a computer's graphic card?
nothing is guaranteed but i would say multiple pages open at once would not be too good for it because the cpu is running around 50-100 percent and that makes the card get hot even if you have a fan they do tend to overheat