Here is my summary:
Well, nVidia released the nForce Pro 2200 MCP and 2050 MCP today.
They are just like the nForce 4 SLIs except a few minor details.
Of course they work with the Opterons, but you can also have up to 4 of these MCPs in a system (1 2200 + 3 2050). This is how it works:
MCP MCP
l........l
CPU-CPU
l........l
CPU-CPU
l........l
CPU-CPU
l........l
CPU-CPU
l........l
MCP MCP
As you can see, each CPU utilizes its 3 Hyper Transport Ports. So what does this mean for that extreme gamer who loves those workstation systems:
* 80 PCI Express lanes across 16 physical connections
* 16 SATA 3Gb/s channels
* 4 GbE interfaces
So you can have a 8-way SLI setup for the normal user.
For the extreme users:
16 5x PCIe (16x in size)
16 PCIe Video Cards with 5-way SLI per card
80-way SLI
As long as you have companies like Asus and Gigabyte who can modify SLI, this will be an option.
I would love to smash other people in games with 80 GeForce 6800 Ultra Extremes and 8 Opteron 850s. Wouldn't you?
Here is Tyan's:
UPDATE:
Tyan's motherboard is now for sale for only $590. Considering that normal dual Opteron boards cost from $200 to $550 and normal SLI boards cost from $200 to $300 ($100 over normal boards), this is a very good deal.