raid controller with the best raid1 read balancing implementation

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which raid controller delivers the best performance with raid1 arrays?

Areca/Tekram ARC-1210, PCIe x8

AMCC 3ware Escalade 9650SE-4LPML, PCIe x4

Promise SuperTrak EX8350, PCIe x4

i know that 3ware speaks of a (up to) ~3,5 time performance increase due to "twinstore" (when using massive amounts of small parallel requests)

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