[Darthtanion]

If you're talking about one of those funnel shaped adapters, you will maybe get a small improvement and very possibly a worse result. While the larger fan likely pushed more air, the funnel shape of these adapters cause a large amount of turbulence in the funnel area... which also happens to be exactly where you need a smooth airflow to blow down onto the heatsink. You would be much better off getting a sink that is designed to be used with an 80mm fan since it will make better use of the added airflow without the turbulence.