So, I have already produced one thread on how to install an SSD into a 2008 mac pro found here - http://forums.macrumors.com/showthread.php?t=962856 I have a 2008 mac pro 2.8 octo and feeling my drives bottleneck the system i want a new solution to give it a new lease of life. Being ready to bite the bullet and buy myself an Intel M 160gb, I started reading about the Seagate Momentus XT. A hybrid drive which contains a 500GB 7200rpm 2.5" drive coupled with 4gbs NAND solid state memory (ssd) so launches all your programs OS etc lightening fast, comparable to an SSD, but provides the storage space of a HDD. So is a good compromise between the two. It also provides an Adaptive Memory Technology which intelligently monitors frequently used applications and places them into the solid state portion of the drive so they can be quickly recalled. This is the link to the Seagate website with the information - http://www.seagate.com/www/en-us/pro...ops/laptop-hdd The video on the page shows a WD velociraptor 3.5" vs hitachi 7200rpm drive vs The Momentus xt vs the SSD. Now obviously the ssd won, but the momentus XT is very close and comes second throughout the tasks beating the velociraptor and destroying the 7200 HDD. The performance is very close and the momentus XT is £110 (average) compared to the intel 160 SSD's £335. So I basically want some opinions on the subject, i have worries that 4gbs isnt enough if you are using a mac pro using multiple programs at once wont the data swop make the drive slower in use? is this just a good compromise for now, but in time these drives will be phased out when ssd becomes cheap enough? But i have heard that in a raid 0 two of these drives are very comparable to an SSD. Meaning 1TB for £220 instead of £1200 for a slow TB SSD. Opinions and experience please!!