Intel® SRMK2 Internet Server Technical Product Specification
20
the worst case (lowest efficiency) of the power supply. Under nominal conditions the power
supply should perform above the 70% efficiency level which will lower the BTU rating.
Table 8: Overall BTU Ratings
BTU (Loaded)
BTU (Max)
314 BTU
988 BTU
Table 9: Loaded System Configuration
Device
Configuration
Manufacturer /
Type
CPU #1
733MHz (133 FSB)
Intel Pentium III
CPU #2
733MHz (133 FSB)
Intel Pentium III
Memory
256MB
Micron 133
HDD #1
SCSI 9.1GB
Quantum Atlas V
HDD #2
SCSI 9.1GB
Quantum Atlas V
CD
Slimline CD
Teac CD224EB
Floppy
Slimline Floppy
Sony MPF 720-3
Table 10: Loaded System Power Draw
Voltage Rail
Current
(Measured)
Power (W)
+3.3V
4.1A
13.53 W
+5V
6.7A
33.5 W
-5V
0.1A
0.5 W
+12V
1.3A
15.6 W
-12V
0.1A
1.2 W
+5VSB
0.1A
0.5 W
Total
64.83 W
2.2.4 System Cooling
Nine 40mm fans provide cooling for the system. Two of the nine fans are dedicated to cooling the
power supply. Six of the fans provide cooling for the processor, memory, and serverboard. One
fan cools the full-length PCI slot (this last fan is 40mm x 17mm and is a bit thinner than the other
40mm x 28mm fans). A two-speed control circuit powers the fans and is located on the SCSI
backplane. The control circuit is driven by a sensor that is located on the front panel to monitor
the incoming air temperature. The fans have a tachometer output that can be sampled through the
ServerWorks
®
ServerSet
™
III LE chipset. The fans can be replaced by removing the top cover,
unplugging the fan connector from the serverboard, lifting the fan out of the fan bracket, and then
inserting the new fan. Additionally, a baffle will be added to help keep the processors and the
memory cool. You should always replace the baffle in the system when you are through working
on the system.
