I'm building my first computer, & was wondering if a 6 Gb/s SATA motherboard & a 3 Gb/s SATA hard drive can be used together? I already have the hard drive & had a motherboard picked out, but my memory is DDR3 1600, so I need a 1666 motherboard. I can't find any that are 3 Gb/s SATA, only the 6. I didn't know if they were backwards compatible, or if you have to match them up...3 & 3 or 6 & 6. Thanks!
The mobo itself should be backwards compatible with SATA 2 and SATA1 speeds. I think it may be possible that the SATA cables may be an issue in some instances, but all the cables I've seen on newegg are backwards compatible with SATA 3 Gbps. When you get the motherboard out I would just check to ensure the cables are backwards compatible, but my guess is you won't have any issues.
Your SATA 3GB/s drive will implode into a black hole. Just kidding SATA 1,2,3 are all compatiable with each other. You can put a SATA 1,2,3 drive into any kind of SATA port.
Like the USPS commercial "If it fits it ships" except ships should be replaced by works.
how about the opposite? will a 6.0 Gb/s SATA HDD still function on a 3.0 Gb/s only MB? (i know you wrote 1,2,3 are all compatible but not sure if i should read that &apply to my question, sorry-thanks!)