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storage - Will a raid cache be better for performance than hard drive cache speeds?

In a device that has raid 5, and a "raid cache" of 4GB, does this help performance? I have 32MB cache hard drives but I was wanting to know if the 4GB cache will make up for the difference in performance between a 128MB hard drive cache and a 32mb cache for the hard drive. Hardware raid. The front end of the device is a 2008 R2 server, Dell R610.

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