Hello fellow iMac users. On 2/14, i purchased a 27" iMac, i5, 3.2Ghz, with the 1 TB fusion drive. by 2/27, I was calling Apple because of constant Kenerl Panics. After 2 weeks of troubleshooting, I couldn't find an issue. Apple suggested a software issue, and re=installed the OS, which I did, and then was still noticing sluggishness. I did a BlackMagicDesign - Disk Speed Test from the Apple Store. The test was reading 30-150MBps. This is absurdly slow. USB 3, and a 7200RMP disk can transfer data faster than this. Apple agreed to do a hardware exchange. Now, on my now sold 2013 iMac with a 3TB fusion Drive, I was seeing Read/Write speeds above 500MBps., with this same test. On my 2014 MBP, i'm seeing 1200Mpbs Read/Write speeds. On my Brand new, out of the box(2nd version) iMac 27", i'm seeing the same poor performance of the Fusion drive. Local Mac Tech Shop tells me that it is the 16GB of crucial memory, the software controlling the fusion drive (which they believe i know how to access and manipulate), or some other fault of mine, using a brand new out of the box iMac. Is there a bad run of fusion drives? am I doing the test incorrectly? help me find out what's missing please. I posted 3 pics: the iMac Fusion Drive, a USB 3 5400RMP drive, USB3 Samsung SSD. advice please. You probably want to know how this is setup and what special stuff i'm using. Here is what i've done: 1.) setup up user account. (did not restore from backup) 2.) Copied 2 linux virtual machines to the drive, 10GB each 3.) installed VMWare Fusion 8 pro. 4.) Installed Dropbox. (note that dropbox was paused during the test results I posted). 5.) I of course installed Blackmagicdesign Disk Speed test from app Store. thanks in advance.