Hi all,
I have a 250gb Samsung 840 EVO that I've been using for a few months as my boot drive (single partition), and I've noticed that the write speed dramatically decreases during the course of benchmarking. In Blackmagic Disk Speed Test, for example, the first write of a 5gb file gives a fine 427mb/s read, but after a handful of cycles, it decreases to 114mb/s read, and continues to drop as the test goes through more cycles. Read speed stays constant.
AJA System Test, when doing a write/read test of a 8gb file, also illustrates this phenomenon: http://imgur.com/ro9NGgA After a certain point, write speeds go haywire.
I'm running 10.9.5, I enabled TRIM through Multibeast (System Information shows TRIM Support: Yes), the drive is connected to a native 6gb/s SATA port using a 6gb/s cable, and it has the latest firmware. The drive has around 100gb free. I've tried switching SATA ports and cables, and I've tried disconnecting SATA and power from all other drives. Nothing helps. Any ideas what might be going on here? Any help would be much appreciated. Thanks.
I've also tested a Kingston SSDNow V300 120gb and it doesn't have this problem.
submitted by lissencephaly
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