Game stutters if there's players

[Bahn]

SATA1 or SATA/150 = 1.5Gbps or 150MB/s
SATA2 or SATA/300 = 3.0Gbps or 300MB/s
SATA3 or SATA/600 = 6.0Gbps or 600MB/s

Just as a nitpick, GigaBITSper second is different from MegaBYTES per second. It's not as simple as moving the decimal place place a couple places to the right. 8 bits = 1 byte, so if you want to get the true throughput, convert the Gigabits into Megabits, then divide by 8.

1.5 Gigabits (Gb with a lowercase b) = 1500 Megabits (Mb with a lowercase b) / 8 = 187.5 MB (what we're all familiar with)
3.0 Gb = 3000 Mb / 8 = 375 MB
6.0 Gb = 6000 Mb / 8 = 750 MB

As you can see, SATA II is sufficient for most $100-$150 lower end SSDs, while SATA III may be necessary for high end SSDs that would put strain on a SATA II controller. However, what SSDs, as another poster eloquently pointed out, are good for in FFXIV is not for the raw read/write speeds, but the very low seek/access times for random file access, which FFXIV does a LOT of. Even a low end SSD would help with this, as long as you get one with low access times (which unfortunately, usually is feature of the higher end more expensive SSDs).

[Digirotta]

1.5 Gigabits (Gb with a lowercase b) = 1500 Megabits (Mb with a lowercase b) / 8 = 187.5 MB (what we're all familiar with)
3.0 Gb = 3000 Mb / 8 = 375 MB
6.0 Gb = 6000 Mb / 8 = 750 MB

How is it that wiki states otherwise?