Best motherboard for 3+ Teslas ? ASUS P6T7 WS SuperComputer or Tyan S7025 ?

[JackOfAll]

There aren’t any PC chipsets which offer more than 38 total PCI-e lanes without resorting to outboard PCI express asic like the nf200. The Intel X58 supports 36 total lanes, and the AMD 790FX supports 32 lanes for GPU lanes + an extra 6 lanes for the south bridge.

But what about the S7025 that was mentioned at the start of the thread. Don’t the dual Xeon boards have 2 NB’s. ie. 2x 5520 chips. The Tyan documentation is not so good, but maybe someone knows how many lanes each 5520 has and how they are routed to the PCIE slots? It could be the case that the 4x double spaced 16x (electrical) PCIE slots actually have 16 physical lanes, no? I’m not an expert, does anyone know?