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30 Cheetah T10 SAS Product Manual, Rev. A
ST3146755SS in 3 Gbit operation
Typical power dissipation under idle conditions in 3Gb operation is 10.74 watts (36.65 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
5). 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.
Figure 7. ST3146755SS (3 Gbit) DC current and power vs. input/output operations per second
ST3146755SS in 1.5 Gbit operation
Typical power dissipation under idle conditions in 1.5 Gbit operation is 10.84 watts (36.99 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
5). 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.
Figure 8. ST3146755SS (1.5 Gbit) DC current and power vs. input/output operations per second
CURRENT/POWER vs THROUGHPUT (SAS - 3.0GB)
Random 8 Block Reads
0.000
0.200
0.400
0.600
0.800
1.0 00
1.2 00
1.4 00
0.0 50.0 100.0 150.0 200.0 250.0 300.0
I/Os per Second
Amperes
0.00
2.00
4.00
6.00
8.00
10 .00
12 .00
14 .00
Power (watts)
5Volt A
12 V o l t A
Watts
CURRENT/POWER vs THROUGHPUT (SAS - 1.5GB)
Random 8 Block Reads
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
0.0 50.0 100.0 150.0 200.0 250.0 300.0
I/Os per Second
Amperes
0.00
2.00
4.00
6.00
8.00
10 .00
12 .00
14 .00
Power (watts)
5Volt A
12 V o l t A
Watts