i have the MSI K9N Platinum, the onboard dual lan chip is vitesse as you said. I have not found a sloution up untill now...
Can you give us a qlue for solving the ethernet problems and all of ours headaches will be gone
Much obliged

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MSI P5Q / C2D E8400 @ 3.0 Ghz / 8GB DDR2 800Mhz / PCIe ECS 9600GT 1Gb / ALC1200 / Windows 7 / OS X 10.8
ASUS K50IN (SX004L) / C2D T6400 @ 2.0 Ghz / 4GB DDR2 800Mhz / nVidia G102M 512Mb / 15.6" HD/LED / ALC662 / Dell 1490 802.11g / Windows 7 / OS X 10.8