Its running a very dated chipset and SATA controller.
Though manufacturers like Samsung are particularly careful with hardware compatibility with a large number of systems (including dated Macs even with Nvidia chipsets that are discontinued long ago), I'm personally thinking in the worst case scenario it'll not work as well with a SATA 1.5 Gb/s system.
You may still go for it though. Among the many SSDs in the market, the Samsung drives have some of the widest compatibility with a huge array of hardware.
Even decent drives like Crucial M4 has compatibility issues with certain systems and it'll keep replicating the ''SSD disappears from BIOS'' bug. Users of affected have to routinely power on their PC to the BIOS stage, let it idle for an hour or so for the M4 to power cycle... They don't have such a comprehensive compatibility testing but I'm sure the current M500 addresses that. That said, Samsung has a much better standing in compatibility testing.
One of the Samsung 830s I have are running on a HM5x chipset with a SATA 3Gb/s controller, it's averaging 260Mb/s read and 250Mb/s write. You probably can expect a SATA I controller to be able to provide half of the figure or so at most.
Since I read that you got a WD Scorpio black,
if its a 7200RPM with a drive cache built in most likely it'll run at ~100Mb/s or so (
this review is telling me WD Scorpio is at 128+Mb/s http://goo.gl/erQ2nX). That said, an SSD in SATA I (1.5Gb/s mode) will run at similar speeds like that and it means you'll get really negligible amounts of performance increases
if it works... Don't forget, your HDD is already a good mass storage device. You'll be sacrificing a lot of storage capacity just for small performance increases in a SATA I system. Think twice.
Don't fix it if it ain't broken, just my 2 cents.
