That is also a possibility. The effect is the same, excellent cooling.
Was going to respond to this earlier, but wanted to avoid offending you and sounding like a broken record. So here's how I'll respond:
70C, you're right, it'll be mostly harmless. However, 80C is where silicon starts to get "iffy" with is semi-conductor properties. Electron migration begins to be a problem as well as heat induced electron pathway degradation. Saying that 80C is acceptable depends greatly on what "acceptable" means to someone personally.
Me? I think 75C is barely acceptable. I strive to make sure the temps on my system, except for VRMs, stay below 70C, ideally 60C as a ceiling. So this card with it huge heatsink and triple fans will maintain a temperature threshold that I would consider acceptable.