A few weeks ago I purchased a new Dell Thunderbolt 3 NVMe SSD drive, SD1-T0500, for my 2017 iMac with 1TB fusion drive. The idea was to have a fast(er) boot drive from this external storage unit without having to open up my iMac and install a larger internal NVMe. The SSD is supposed to be quite speedy, 2,800MB/s read and around 1,000MBs for write, according to some tests and specs. It is based on KXG50ZNV512G NVMe TOSHIBA 512GB. I formatted the drive as APFS and did a new OS install, High Sierra 10.13.6. Here are my first observations: Blackmagic 5TB speed test reports no more than 500MBs write and about 2350MBs read. So about half as fast as advertised write speeds. I tired different stress settings in Blackmagic and all result in similar performance. Is this reduced performance possibly related to APFS? The drive is NOISY! It has an internal fan that comes on every few seconds and it is quite loud. One can easily hear it in a silent room. There does not seem to be any way to control the fan. I experienced several kernel panics, presumably caused by this drive (NVMe-related). Eventually, I turned off hard disk sleep in Energy Saver settings and that seems to have fixed the problem. Overall, I am fairly happy with the drive (it is amazingly small and fast), but the noise slightly annoys me. I was wondering if anyone else has this drive and what your own experience may be?