HP Model 748 HP Model 748 Service Handbook - Page 39

Table 3-3, Model 744 Current Requirements Worksheet, Each Model 744 Board Computer, 5V dc, 12V dc

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Configuration Power Budgeting Table 3-3 Model 744 Current Requirements Worksheet Each Model 744 Board Computer +5V dc Amps +12V dc Amps -12V dc Amps If 132 MHz, current for +5V dc is 4.7A 1 If 165 MHz, current for +5V dc is 6.3A ______ 0.1A 0.1A RAM cards (see Table 3-1 or Table 3-2) ________ Graphics subsystems 2 x 0.9A each = FWD SCSI GSC card x 0.7A each = HCRX graphics board 2.0A PMC bridge adapter 0.6A PMC cards on bridge adapter 3 Totals for Model 744 board computer 1. Does not include on-board graphics, if installed. 2. On-board graphics and graphics accessory cards are each separate graphics subsystems. 3. PMC cards may also draw +3.3 current that is provided through the +5 on the bridge adapter. The +3.3 current FOR ALL PMC CARDS ON THE BRIDGE ADAPTER AND EXPANSION ADAPTER (do not include other expansion adapter currents) must be entered into the +5 column after multiplying the +3.3 current by .75 to convert to the actual +5 current draw. 3-7

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Configuration
Power Budgeting
3-7
Table 3-3
Model 744 Current Requirements Worksheet
Each Model 744 Board Computer
+5V dc
Amps
+12V dc
Amps
-12V dc
Amps
If 132 MHz, current for +5V dc is 4.7A
1
If 165 MHz, current for +5V dc is 6.3A
______
0.1A
0.1A
RAM cards (see Table 3-1 or Table 3-2)
________
Graphics subsystems
2
x 0.9A each =
FWD SCSI GSC card x 0.7A each =
HCRX graphics board
2.0A
PMC bridge adapter
0.6A
PMC cards on bridge adapter
3
________
________
Totals for Model 744 board computer
________
________
1. Does not include on-board graphics, if installed.
2. On-board graphics and graphics accessory cards are each separate graphics subsystems.
3. PMC cards may also draw
+3.3 current that is provided through the +5 on the bridge adapter.
The
+3.3 current
FOR ALL PMC CARDS ON THE BRIDGE ADAPTER AND EXPANSION
ADAPTER (do not include other expansion adapter currents) must be entered into the +5 column
after multiplying the +3.3 current by .75 to convert to the actual +5 current draw.