Furmark is a VERY stressful test, you'll never see such high temperatures under gaming loads although you should watch the temperatures if you are part of the folding@home community, it's also a demanding application.
That said, your current temperatures are good, rest assured no harm will come to your cards, they're quite, quite safe.
FYI, yes, my '6950 has a Zalman cooler, but I work odd hours and the household was giving me grief over the stock coolers noise
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