mrkrad, thank you for reply. I have recently installed a LSI 9211-4i in a 2005 Asus A8N-SLI Premium to gain 6mb/s transfer speeds for my 840 PRO 512. I found the hard way SAS2004 IT Mode doesn't support TRIM. Through further research I found that SAS utilizes UNMAP, TRIM being SATA counterpart. I've read mass blogs, it appears that a filter driver configured to send UNMAP commands is required, running in conjunction with Storport driver. This sounds to me like we're responsible for writing such a driver, or have done by a Server Guru, for I can't find any preconfigured setup. To Avoid removing SAS Controller, I found a utility called PerfectStorage 3.0. Looks like a disk defrager, but very fast, that manually unmaps all unused blocks. It works slick, but only for mounted drives, drive needs connected to motherboard to do full Magician TRIM on unformatted, boot... areas. I'll continue researching, I'm a C Programmer, but don't risk my data fooling around developing such a driver.