We looked a bit deeper in Intel’s plans for Clarkdale and Lynnfield CPUs and it turns out that its new 5th generation mainstream chipsets won't feature support for SATA 6Gb/s. Both P55, that comes in Q3 2009, and P57 that comes in Q1 2010 and has better support for 32nm CPU with IGP Clarksdale, won’t support SATA 3.
This comes as quite a surprise, as AMD prepares its SB820 Southbridge that should have SATA 3 support and this Southbridge should launch in early 2010. Since both P55 and P57 are single chip chipsets Intel will have to release a new chipset to get SATA 3 support.
The SATA 3 specification will offer up to 750MB/s transfers while SATA 2 offers only 375MB/s. Some SSD drives will definitely need SATA 3 bandwidth, especially when raided, and we are sure that Intel will get a chipset with SATA 3 support, but obviously not in Q1 2010.