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RAID 0 is a mirror - it does not double the write speed (impossible - as it's actually writing the data to two discs (albeit simultaneously) it's marginally slower). Thoretically it can double read speed as it can get the data from either disc - with a traditional HDD it can get the data from whichever disc's heads are physically closer. In practice speed is about 1.2x. If the disc is solid state then the performance increase is negligeable.
The throughput of a PCIx is better assuming there is enough buffering.
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Ian
Current: 2021 G21 330i M-Sport
Previous: 2018 A6 Avant S-Line MMI+, 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2
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