Because of the physical design b m key cards are limited to pcie x2 speeds.
M key type.
Uses a gap in the left side of the card right side of the host controller with five pins to the left of the gap.
M 2 replaces the msata standard which uses the pci express mini card physical card layout and connectors.
Model m designates a group of computer keyboards designed and manufactured by ibm starting in 1984 and later by lexmark international maxi switch and unicomp.
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Uses both of the above gaps with five pins on the left side of the card and six on the right.
This configuration supports pcie x4 bus connections for twice the data throughput.
Examples from the dell website.
B m and b m.
M and b are different connector types for m 2 slots.
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B m or b m while a socket can only have one key.
A b keying pins 12 19 gives pci express ssds up to 2x lanes of bandwidth while a m keying pins 59 66 provides pci express ssds with up to 4x lanes of bandwidth.
Above is a picture of two m 2 slots on the motherboard of an hp stream mini.
An m 2 2280 sata ssd purchased separately.
M 2 formerly known as the next generation form factor ngff is a specification for internally mounted computer expansion cards and associated connectors.
The keyboard s many variations have their own distinct characteristics with the vast majority having a buckling spring key design and swappable keycaps.
A b key enables sata or pcie nvme ssds using up to 2 pcie lanes and an m key enables using up to 4 pcie lanes.
Typing sensible text is much easier than repeating random letters and it helps you to remember frequent key combinations.
The slot on the left uses module key e and the one on the right uses module key b.
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Available m 2 nvme m key options for configuration for a precision 5510.
Model m keyboards have been praised by computer enthusiasts and frequent typists due to their durability and consistency and the tactile and auditory feedback they provide.
You will find the key type labeled on or near the edge connector or gold fingers of the ssd.
Currently an m 2 ssd has either one of three key types.
Ssd s using the pcie x4 bus very fast ssd s use m keys since it s the only one that supports pcie x4 lanes.
The wi fi card is keyed for slots a.
Employing a more flexible physical specification the m 2 allows different module widths and lengths and paired with the.
As the key positions of b and m are slightly different the m.
The m 2 specification identifies 12 key ids on the module card and socket interface but m 2 ssds typically use three common keys.