[MacTUG] iMac firmware update enables SATA III capabilities | MacFixIt

[Marlon A. Griffith]

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Update, 11:30 a.m. PDT: The new iMac line apparently uses the latest Z68 chipset from Intel, which offers a number of improvements and features including support for hybrid SSD/HDD drives and 6Gb/sec SATA support for up to two drives according to Z68 specifications, which Apple's update has unlocked. The chipset is apparently supposed to launch on May 8, but Apple apparently was able to get them in the new iMac systems early.
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http://reviews.cnet.com/8301-13727_7-20060111-263.html