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You can, although the speed is going to be limited by the older SATA that is in the computer. I still think it's a worthwhile investment, as it will speed up the computer a great deal.
 
Thanks guys.
I did it and the process went as smooth as silk.
Used carbon copy cloner to clone my existing drive to the new SSD using a rosewill 2.5 SATA enclosure I got from newegg for $12, then swapped out the drives.

The speed difference is amazing especially with photoshop and word.
 
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