On Thu, Jun 02, 2016 at 04:21:22PM -0400, Greg Freemyer wrote:
On Thu, Jun 2, 2016 at 3:56 PM, Andrei Borzenkov <arvidjaar@gmail.com> wrote:
02.06.2016 16:27, Greg Freemyer пишет: === M.2 M Key device using AHCI protocol ===
Samsung XP941 SSD PCIe M Key 2280 MZHPU128HCGM-00000
AHCI is _not_ NVMe!!! AHCI is SATA. That's the trickery with the M.2 Slot. It can be SATA, USB or PCIe.
$120 from Amazon
JFTR I've made good experiences with the following Samsung M.2 NVMe: # nvme list Node Model Version Namepace Usage Format FW Rev ---------------- -------------------- -------- -------- -------------------------- ---------------- -------- /dev/nvme0n1 SAMSUNG MZVPV256HDGL 1.1 1 26,26 GB / 256,06 GB 512 B + 0 B BXW72H0Q A quick search show it @ ~125€.
=== M.2 M Key device using NVMe protocol ===
Samsung PM951 128GB M.2 NGFF PCIe Gen3 x4, NVME Solid state drive SSD, OEM (2280) ( MZVLV128HCGR-00000
$74 from Amazon ====
Both of those should do well over 500 MB/sec in sequential read access situations.
Do you know if a PCIe adapter card has to support AHCI vs NVMe, or does the PCIe card just connect the PCIe bus pins to the M.2 connector pins and could careless what protocol is in use?
I've got a couple workstations with different X99 motherboards. Hopefully one or both supports booting from both of those SSDs. Regardless it will be an interesting learning experience. I simply don't know much about this class of SSD yet, and I really should now that prices are getting down to affordable.
It looks to me that these devices will soon eliminate the 2.5" form factor SSDs with a SATA interface that I'm most used to seeing in laptops. (I have seen a number of mSATA and M.2 B-Keyed SSDs already, but the 2.5" form factor still dominates what I see in my work. The NVMe SSD in the Alienware is the first NVMe SSD I've come across.)
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