After a lot of trouble with on-board LAN was a change of NICs are needed, and for a little Search WWW I stayed irgendwan depend on the CT Desktop cards from Intel. Sound Reviews on div. Sides this should work smoothly and relatively quickly, which Me previous maximum of 12 MiB / s, regular transport links with the burglaries onboard solutions solutions more than promised. Previous attempts with Realtek-based cards were also in the pants gone, whether by the same problems as with onboard LAN, or, as in the case of 3 building Realtek PCIe same-GBit cards by (3 computers) with the simultaneous death one week Installation (with also max. 12 MiB / s mind you). The Intel cards have meanwhile survived and convincing 50-80 MiB / s per week deadline strength based on file size and mixing and so far 100% stability. There are no settings necessary, the cards must be only eigebaut, installing drivers from Intel (not going must be downloaded) and you're done. The only drawback, under Vista, there is no standard driver ie the cards do not run without external drivers. Which you should download so before you turn off the Onboardkram.
Conclusion: The Intel tickets cost 2-3 times other Gb solutions, but reward you with some 5-8fachen data rate compared to the onboard LAN (here 2x with Gigabyte P35 and X58 chipset, 1x Zotac nVidia ION) or other favorable NICs. Buy, install, offers - are the things worth it.