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Results would probably be a bit better with a 45nm quad such as the q9550/9650. Coupled with the much better P45 chipset boards. x48 was pretty poor with the 45nm quads when it came to overclocking.
Yes, I've heard little good about those nforce chipsets. I had one many years ago, though I can't remember much about it tbh. I think it was either nforce or nforce 2.
Unlinked memory and fsb was pretty ok on Nforce 6, it was a cracking board with a dual core cpu. My only other forte into Nforce was with AMD s939 based systems.
My evga 680i was the A1 revision model, supposedly better with quads. I dont want to think how bad the first model must have been, as the A1 was rubbish with a quad.