The combination of SandForce's SF-2281 controller, Intel's 25nm synchronous flash and now Intel's unique firmware found only in the 520 Series is nearly unbeatable.
When you pair these drives with a motherboard based on an Intel chipset you get very good RAID 0 performance, but that whole lack of TRIM thing is still looming over head. I can't tell you when we'll see RAID 0 TRIM only because I don't know. There are a handful of hints floating around that lead us to believe it's coming soon, but we can't pin point a date for you just yet. Let's just hope it's sooner rather than later.
I think the biggest issue holding most users back from running dual 520 Series drives in RAID 0 is the cost. The 240GB drives we looked at today cost around $550 each at this time. The cost will go down over time, but once again, we don't know when that will be or how low they will go. The 520 Series is one of the most expensive SSDs on the market today. When compared to the Vertex 3 240GB the 520 Series costs nearly $200 more each, a pretty large split. For the additional money you get an extensive amount of testing and validation from Intel's famed labs.
I think for the time being you'd be better off with a single drive until we finally get TRIM on RAID 0. With the Intel 520 Series drives selling at a premium you could purchase a single drive today and then when the new software hits you can purchase another drive, hopefully at a lower price.
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