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NezSez writes regarding an article in extremetech:
"SATA Express is SATA and PCIe over cables (preserving backwards compatibility) and NVMe is the next improvement of AHCI with much lower latencies by using the PCIe bus/lanes. Both have been developed to improve access to SSD's which have their own processors on-board and can communicate quicker than mechanical drives. The specifications look good (up to 4 times faster and can scale with improvements of PCIe) but analysts suspect it will only be adopted for small form factors.
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SSDs driving SATA Express and NVMe innovation
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(Score: 3, Informative) by wantkitteh on Monday March 17 2014, @03:34PM
...although having said that, I realised that I'm automatically in my head comparing 7k SATA and SSD, not 10k SAS and SSD. So I must qualify my statement and say that the only defense SAS will shortly have is it's legacy support in everyone's racks.