I've used the MSI Afterburner before (with my ASUS cards heh) to tune my fan speeds, I found that with my case I didn't need as high a fan speed as was default to keep things cool, and I hate noise, so I'd tune my fan speeds to be lower than default. Also used it to do some mild overclocking.
But if you're not interested in overclocking or tuning your fan speed or monitoring your GPU temperatures or anything like that then you're fine without them.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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