This specific model of IBM - x3650 M4 - features better CPU - E5-2620.
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After checking that comparison chart it seems like a no brainier to look at that IBM more closely. 1 thing to keep in mind is compare their warranties, make sure that you are satisfied with the warranty level of the server you pick. You don't want to be on your own if/when your hardware fails. There is never a guarantee that your hardware will fail, but it's better to be safe than sorry.
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