Those Xeon E5's are 50w at idle, plus 10w for the 10Gb Ethernet, before you add any storage. A core 3 N300 is 1/10 of the power usage, for ~85% of the performance. Integrity at the filesystem level is required _anyway_ but if you want ECC ram, there's a bunch of AMD processors with similar power usage.
Those Xeon E5's are 50w at idle, plus 10w for the 10Gb Ethernet, before you add any storage. A core 3 N300 is 1/10 of the power usage, for ~85% of the performance. Integrity at the filesystem level is required _anyway_ but if you want ECC ram, there's a bunch of AMD processors with similar power usage.