RE: I would like to upgrade my Dell Studio XPS 1645 to an SSD, any advice?
We would not suggest the upgrade as it may lead to issues.
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There should be no issues, though the system is old enough that you won't see full performance from an SSD (it's a SATA 3G system).
It'll still blow away any hard drive in performance though -- you would likely be best off buying a kit that includes a 2.5 mm spacer with the drive (most SSDs are 7 mm, while the hard drive you have is a 9.5 mm unit).