Hi Nathan,
I did not see anything specific in the release notes on this, but Mellanox has a later version 4.80.50000 on their website. Might be worth a shot to try the new driver on a test sever.
Mellanox Products: Mellanox OFED for Windows (WinOF) http://www.mellanox.com/page/products_dyn?product_family=32&mtag=windows_sw_drivers