We reported on the MSI press release several days ago, citing translation problems as an indication that the press release might not be completely accurate.
And speaking to MSI's UK rep, we discovered we were correct when assuming the release had accidentally cut-off the announcement of the budget board based on the Nvidia Nforce 650i Ultra chipset.
So you should expect three MSI motherboards based on the 6xx series from Nvidia, not two.
The P6N Diamond uses the Nvidia 680i, the P6N SLI Platinum contains the Nvidia 650i chipset, and the P6N Neo utilises the 650i Ultra (C55+MCP51) offering from Nvidia.
The press release confusingly speaks about quad SLI on the P6N Diamond, which we can confirm uses two 16x and one 8x PCI-Express slots - the quad SLI refers to using two multi-GPU boards in parallel on the 16x slots.
Furthermore, MSI released a statement confirming which boards are ready for the Intel Core 2 Extreme QX6700 quad-core shenanigans, which include:
We hope this has cleared up all of your questions. µ
L'IINQ
MSI press release
MSI launches Nvidian 680i
motherboards