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#1951
Nah...you should be fine for quite a while. I'm running an Nvidia 9800 GTX+ and it hasn't really struggled to run nearly every game at high or ultra settings at this point.
Well, the good news is that a good computer should come in at just about the middle of that range. $1500 gives you a solid box. Unless you really need something ultra fancy or specialized configuration, spending $3,000 is probably not a wise investment.
Actually, with this SSD, you would actually want SATA III controllers. Make sure that you understand that 3Gb/s is 3 gigaBITS per second and not bytes. Therefore, when you do the math and provide for some overhead, it comes out to about 300 megabytes per second max on the interface. Thus, if you have an SSD which can do over 300...you would need the higher capacity controller to take full advantage of it.
The speed boost itself though wouldn't really get utilized all that much for running an OS or loading a game. The primary benefit of the SSD is it's extremely low access times...and these don't really improve in a RAID configuration. Now, if the RAID array were to be used for storage...that RAID setup could make a huge difference...but I don't think many are able to afford a solid storage configuration with SSD drives.