There were several variations of your motherboard. The NVIDIA nForce 680i SLI and the NVIDIA nForce 680i SLI LT models are only SATA 2 3Gb/s capable.
A SATA 3 6Gb/s ssd and a SATA 2 6Gb/s ssd will both work with your motherboard but a SATA 3 6Gb/s ssd's performance will be reduced to SATA 2 3Gb/s levels.
thanks! i assume i can just go ahead and order it and give it a go? i do know it will reduce the speed since it's not a SATA III mobo.