Depends on your hardware configuration. If you configure with two 95W processors and more than 6 standard volt memory DIMM's (or 10 low volt DIMM's), then you must go with the 550. Also, if you configure with a PERC H710, you can only have 8 low volt DIMM's. Just depends on your hardware configuration. If you plan to upgrade down the road, then get the 550 now.
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