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24 Cheetah 10K.6 FC Product Manual, Rev. B
6.3 Power dissipation
ST3146807FC
Typical power dissipation under idle conditions is 10.72 watts (37.3 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
9). 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 9. ST3146807FC DC current and power vs. input/output operations per second
Note. Values shown are for operation at 2Gb, for operation at 1Gb, reduce the +5V by.10 amps. The +12V
current values are not affected by loop speed.
ST373307FC
Typical power dissipation under idle conditions is 8.99 watts (30.7 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
9). 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 10. ST373307FC DC current and power vs. input/output operations per second
Note. Values shown are for operation at 2Gb, for operation at 1Gb, reduce the +5V by.10Amps. The +12V
current values are not affected by loop speed.
ST3146807FC DC CURRENT/POWER vs THROUGHPUT (2 Gb)
Random 8 Block Reads
0.400
0.600
0.800
1.000
1.200
1.400
1.600
1.800
0.0 50.0 100.0 150.0 200.0 250.0
I/Os per Second
Amperes
4.00
6.00
8.00
10 .0 0
12 .0 0
14 .0 0
16 .0 0
18 .0 0
Power (watts)
5Volt A
12 V o l t A
Watts
ST373307 FC CURRENT/POWER vs THROUGHPUT (2 gig)
Random 8 Block Reads
0.400
0.600
0.800
1.0 00
1.2 00
1.4 00
1.6 00
1.8 00
0.0 50.0 100.0 150.0 200.0 250.0 300.0
I/Os per Second
Amperes
4.00
6.00
8.00
10. 00
12. 00
14. 00
16. 00
18. 00
Power (watts)
5Volt A
12 Vo l t A
Watts