Yeah, I'm aware of that, but as far as I know those memory chips can run just fine as is with a tiny bit of an airflow.
Having them like that and cooled by BGA chip coolers or an L shaped heatspreader wouldn't make a difference in overclocking them ( that's just a wild guess, I have yet to receive my retail sample and confirm my guess ).

I shall have the card in a few hours, so I guess I'll have some proper info and input soon