The Arc Midi R2 have the following improvements from Arc Midi R1
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The 2 HDD cages are now split into two cages; top cage with 5 drives and the bottom cage with 3 drives (previously 4+4) to better accommodate dual graphics card setups 
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Fan controller is integrated in the front panel and supports up to 3 fans 
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3 Silent Series R2 hydraulic bearing fans included, contributing to a longer life span 
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2 SSDs can be installed on the back of the motherboard plate 
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Front fan filter can now be removed from the case and easily washed separately 
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Bottom HDD cage is fitted with screws instead of rivets and can be easily repositioned or removed 
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The top and front mesh are constructed of thicker metal, making sure it’s completely flat and level 
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The logo on the front panel has been moved from above the bays to the bottom of the front panel within the mesh 
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It now comes standard with a window side panel, slightly tinted 
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Front fans are fastened with screws instead of plastic clips 
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The front structure has been modified to better accommodate radiators for water cooling