Dell PE R720XD User Manual download pdf (Page 29)

A Principled Technologies test report 29

Microsoft Exchange consolidation and TCO: Dell PowerEdge R720xd vs.

HP ProLiant DL380 G6

Energy costs

Figure 10 shows the calculations for the annual energy cost estimates.

Annual costs - Energy costs

Dell PowerEdge R720xd

HP ProLiant DL380 G6

Cost per kWh

0.1039

Typical watts

225.2

153

Annual kWh per server

1,972.75

1,340.28

Multiplier for cooling

1.8

2.0

Total kWh for power and cooling one server

3,551.0

2,680.6

Annual energy cost per server

$369

$279

Annual energy cost for solution

$369

$1,114

Figure 10: Energy cost calculations for the two solutions.

Rack and space costs

We assume each server has a single port out and that the data center charges an annual per port cost of $250.

We assume an annual data center per rack cost of $2,170 or $98.64 per rack unit based on each rack holding 22u of

servers.

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Dell PE R720XD User Manual Page 29