A Short Discussion on NGFF M.2 NVMe: Difference between revisions

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<nowiki>*</nowiki> Notice that the word ''can'' is in italics. This means a socket or device ''can'' support those protocols, it doesn't mean that they do.

== Real World Implementation ==

==Real World Implementation==

===Sockets (and what the keying indicates)===

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*B-Key: SATA / AHCI, PCI-E 2 Lane, and USB*

*M-Key: SATA / AHCI, PCI-E 2 Lane and 4 Lane, and USB, ...but, may only implement PCI-E 4 Lane*

**And more to the point, if a ''device'' is keyed as M, then it is essentially saying, I need a socket that supports PCI-E with 4 Lanes.

*B and M Key: SATA / AHCI, PCI-E 2 Lane and 4 Lane, and USB*

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Be sure to read the details of what the manufacturer specifics. Realize that many manufacturers don't have a full grip on what they've made (IE, engineers aren't on speaking terms with the advertising personnel or people that document the product) and websites selling the product often times do a poor job of including all of the information on what the product supports.

=== Heat Sinks ===

If a device manufacturer (like Western Digital) offers a unit with and without a heat sink, if you've got the space, get one with the heat sink. Why? Well, all those performance numbers for reading and writing have a tendency to drop quite a bit lower as heat rises.

If using a smaller USB enclosure, make sure the enclosure doubles as a heat sink. And yes, speed via USB 3.0 will probably be the bottleneck even if an NVMe drive is running hot. But for USB 3.1, make sure the enclosure doubles as a heat sink. And remember, studies have shown that excessive heat will cause a shorter life span for SSDs (as it seems to do for many electronic components).

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@@ Line 10: / Line 10: @@
 <nowiki>*</nowiki> Notice that the word ''can'' is in italics.  This means a socket or device ''can'' support those protocols, it doesn't mean that they do.
-== Real World Implementation ==
+==Real World Implementation==
 ===Sockets (and what the keying indicates)===
@@ Line 22: / Line 22: @@
 *B-Key: SATA / AHCI, PCI-E 2 Lane, and USB*
 *M-Key: SATA / AHCI, PCI-E 2 Lane and 4 Lane, and USB, ...but, may only implement PCI-E 4 Lane*
+**And more to the point, if a ''device'' is keyed as M, then it is essentially saying, I need a socket that supports PCI-E with 4 Lanes.
 *B and M Key: SATA / AHCI, PCI-E 2 Lane and 4 Lane, and USB*
@@ Line 27: / Line 28: @@
 Be sure to read the details of what the manufacturer specifics.  Realize that many manufacturers don't have a full grip on what they've made (IE, engineers aren't on speaking terms with the advertising personnel or people that document the product) and websites selling the product often times do a poor job of including all of the information on what the product supports.
+=== Heat Sinks ===
+If a device manufacturer (like Western Digital) offers a unit with and without a heat sink, if you've got the space, get one with the heat sink.  Why?  Well, all those performance numbers for reading and writing have a tendency to drop quite a bit lower as heat rises.
+If using a smaller USB enclosure, make sure the enclosure doubles as a heat sink.  And yes, speed via USB 3.0 will probably be the bottleneck even if an NVMe drive is running hot.  But for USB 3.1, make sure the enclosure doubles as a heat sink.  And remember, studies have shown that excessive heat will cause a shorter life span for SSDs (as it seems to do for many electronic components).
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