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I have a 3825 router that came with the default 2 x 256 sticks of memory. According to the Cisco website the router can be upgraded to 2 x 512 sticks to total 1 GB. I found that if I put 1 stick of 512 in the router it boots up fine. If I have 2 sticks of 256 it boots up fine, but if I put in 1 stick of 512 and 1 stick of 256 the router fails to boot at all. A console session to the router shows nothing but a black screen after waiting for over 5 minutes. Has anyone run into this before? Can I only install 2 sticks of memory if they are same size? I don't see anything on the Cisco website about installing memory in pairs.
Any help would be greatly appreciated.
Yes, the memory modules need to be the same size.
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