Seagate ST936751SS manual Power dissipation, ST973451SS in 3 Gbit operation

6.3Power dissipation

ST973451SS in 3 Gbit operation

Typical power dissipation under idle conditions in 3Gb operation is 5.93 watts (20.23 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 3). 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.

CURRENT/POWER vs THROUGHPUT (SAS - 3.0GB)

Random 8 Block Reads

	1.400									14.00	5Volt A
											12 Volt A
	1.200									12.00	Watts
	1.000									10.00	Power (watts)
Amperes	0.800									8.00
	0.600									6.00
	0.400									4.00
	0.200									2.00
	0.000									0.00
	0.0	50.0	100.0	150.0	200.0	250.0	300.0	350.0	400.0	450.0

I/Os per Second

Figure 3. ST973451SS (3 Gbit) DC current and power vs. input/output operations per second

ST973451SS in 1.5 Gbit operation

Typical power dissipation under idle conditions in 1.5 Gbit operation is 5.98 watts (20.41 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 3). 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.

CURRENT/POWER vs THROUGHPUT (SAS - 1.5GB)

Random 8 Block Reads

	1.400									14.00	5Volt A
											12 Volt A
	1.200									12.00	Watts
	1.000									10.00	Power (watts)
Amperes	0.800									8.00
	0.600									6.00
	0.400									4.00
	0.200									2.00
	0.000									0.00
	0.0	50.0	100.0	150.0	200.0	250.0	300.0	350.0	400.0	450.0

I/Os per Second

Figure 4. ST973451SS (1.5 Gbit) DC current and power vs. input/output operations per second

Savvio 15K SAS Product Manual, Rev. B 27