OC'd video cards at ~70% fans for 9+ months sustainable?

[m0w3r]

Question:
I'm planning to run my video card fans at ~70% for the next 9-12 months with as near to 24/7 uptime as possible.
Also, the card temps are usually a little below 70C.  This fan speed seems to have been fine for the last month, but should they likely last another full year?
Or, will the cards (or fans mostly) likely get damaged?

Also, the model of specific cards I have are:
Diamond 6970 - reference 2gb card
Sapphire 5830 xtreme

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[Jezzz]

I hope so.  I've been running mine at 100% for about a month now.

[ArtForz]

If the ref cards fan doesn't die within the first month or so (= manufacturing defect), it'll probably last near forever.
The sapphire extreme 5830/5850... not so much, those have really cheap sleeve bearing fans. I'd be surprised if it lasted much over 6 months at 70%.

[abracadabra]

I run mine at about 85%.  I see no diff in temps raising fan speeds about that.

[Jezzz]

I really should try reducing the fan speed as a test.  It's been working, so I'm reluctant to change it.