The main difference between 680i SLI and 780i SLI:
1. support PCIe Gen2
2. 3 x PCIe x16
3. support 3-way SLI
Because the 780i SLI is using the 680i SLI's south bridge and north bridge plus a BR04 chip, so there is no huge difference between 680i SLI, even the hottest topic: 3-way SLI is only an driver upgrade, doesn't need any architecture changes.(NV later will release a 3-way SLI driver for 680i SLI.)
Test bed:
test reasult:
for more info & scores pls go to the source: [FF not friendly..] http://topic.expreview.com/2007-10-18/1192682447d6049.html