Blade systems take a more modular approach, cramming much more processing capability into a smaller space by moving a lot of IO components out of the server and into the chassis. For those who need to run multiple nodes, blades can be more affordable to build out, more power efficient, and take up less space. The downside is the up-front cost for the chassis, with cost savings better realized as the blade gets built out with nodes. Blade components are typically proprietary to a particular OEM, so blades are more like a marriage than a date.
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