damnesiac, I personally experienced this on my nForce 4 Board,

Rev. 1 - Working - I had to use one of the workarounds,
disabling nForce LAN, and enabling the second LAN port (Marvell), it worked fine

-> NO Lan Freezes

Rev. 2 - Working Out of the Box without having to be patched,

-> NO Lan Freezes.

However, I am using an AirPort Extreme now, hence Wi-Fi goodness.