Hi, In doing my research on SSD's, and I still have a few questions. What I know: I know that my Mac Pro (2008) runs at Sata II / 3Gbps, so it won't take advantage of the new 6Gbps standard. I saw Crucial m4 recommended on here for the Mac Pro, and I was looking on B+H. Here's the M4: http://www.bhphotovideo.com/c/produ..._Technology_CT256M4SSD2_256GB_m4_SSD_2_5.html Here's the V4: http://www.bhphotovideo.com/c/product/897177-REG/Crucial_ct256v4ssd2_256GB_V4_SSD_2_5.html (says it was designed for computers before 2011 (3Gbps speeds) The difference in price is less than $4. Q1: Is there any reason I wouldn't get the M4? Do they work like hard drives in that they'll work at the lower speed they way they are supposed to? Q2: I'm guessing its as easy as plug it in (like a hard drive)? I keep reading about the benefits of different 'controllers' on the SSD. Is the controller something on the SSD (therefore important which SSD I choose? I guess what I'm asking is - I don't need an extra controller card when I order this, do I? Q3: The most recent 'what SSD in my Mac Pro' thread I found is from June or July 2012. Any further recommendations now? Q4: Do I need to be concerned about SLC or MLC SSD's? There are arguments on the web that 'controller' is more important then the type of cell memory, and others that say it's all important. Q5: I understand the principal behind TRIM. I don't know whether Trim (on lion) is an automatic cleanup or not, or if it's something I need to do (like a defrag) every once in a while. On OWC, they say their drives don't need to do any of this nonsense, but their drives are much less affordable, even the 3Gbps version. Thanks for your insights.