Seagate ST336754SS Cheetah 15K.4 SAS Product Manual - Page 41
Power dissipation
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6.3 Power dissipation ST3146854SS in 3 Gbit operation Typical power dissipation under idle conditions in 3Gb operation is 14.34 watts (48.93 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123. Amperes 1.800 1.600 1.400 1.200 1.000 0.800 0.600 0.400 0.0 ST3146854SS DC CURRENT/POWER vs THROUGHPUT (3 Gbit) Random 8 Block Reads 20.00 18.00 16.00 14.00 12.00 10.00 8.00 6.00 4.00 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 I/Os per Second Power (watts) 5Vo lt A 12 Vo lt A Watts Figure 8. ST3146854SS (3 Gbit) DC current and power vs. input/output operations per second ST3146854SS in 1.5 Gbit operation Typical power dissipation under idle conditions in 1.5 Gbit operation is 14.64 watts (49.96 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123. Amperes 1.800 1.600 1.400 1.200 1.000 0.800 0.600 0.400 0.0 ST3146854SS DC CURRENT/POWER vs THROUGHPUT (1.5 Gbit) Random 8 Block Reads 20.00 18.00 16.00 14.00 12.00 10.00 8.00 6.00 4.00 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 I/Os per Second Power (watts) 5Vo lt A 12 Vo lt A Watts Figure 9. ST3146854SS (1.5 Gbit) DC current and power vs. input/output operations per second Cheetah 15K.4 SAS Product Manual, Rev. B 31