1680x is 512mb/833mhz
I did check the Manual for 1680 cards and it looks like there is two versions of the 1680x.
v 1.x = 256MB cache and 800Mhz IOP348
v 2.0 = 512MB cache and 1200Mhz IOP348
http://www.areca.us//support/download/RaidCards/Documents/Manual_Spec/SAS_Manual.zip
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