The chaps over at TweakTown take a look at the technology behind the 600i series nForce chipset. Here's an excerpt:

590 SLI was talked about for months but the new nForce 680i took half the time from production to market - most possibly because half the technology was already available, the MCP 590 just got a rename to MCP 680 as only a new Northbridge or SPP had to be fabricated. nVidia has in reality made a very good start to its overclocking campaign and with so many enthusiasts out there with phase change, water cooling and even LN2 rigs floating around, we can clearly foresee some records being completely shattered with a 680i motherboard, Core 2 Extreme Quad Core processor and a pair of GeForce 8800GTX graphics cards in SLI mode.

For eVGA's part in the process, the motherboard worked perfectly - no glitches, no bugs and no random reboots and BSOD's apart from the normal and well excepted errors when we overclock too much, but we never learn that lesson here.

Pros
- Fast
- Supports all Core 2 processors
- More stable than 590SLI Intel
- Overclocks better than any other Core 2 chipset to date
- Dual Gigabit LAN with bridging for 2Gbps function
- SLI Ready
- Third Graphics slot for Physics engine
- Water cooling users not forgotten
- Unlinked CPU FSB and RAM overclocking

Cons
- No additional SATA controllers or e.SATA ports
- Expensive but other 680i boards will be even more expensive