Supermicro SuperServer 2028R-TXR User Manual page 65

Power Connectors
A 24-pin main power supply connector
( J P W R 1 ) , t w o 8 - p i n C P U p o w e r
connectors (JPWR2/JPWR3), and a
4-pin Auxiliary power connector (JPWR4)
are located on the motherboard. These
power connectors meet the SSI EPS 12V
specifi cation and must be connected to
your power supply to provide adequate
power to the system. See the tables on
the right for pin defi nitions.
Fan Headers
This motherboard has 11 system/cooling
fan headers (FAN1-FAN7, FANA-FAND)
on the motherboard. FAN6 is for CPU1,
and FAN7, for CPU2. All these 4-pin
fan headers are backward compatible
with the traditional 3-pin fans. However,
fan speed control is available for 4-pin
fans only. The fan speeds are controlled
by Thermal Management via IPMI 2.0
interface. See the table on the right for
pin defi nitions.
Chapter 5: Advanced Serverboard Setup
ATX Power 24-pin Connector
Pin Defi nitions (JPW1)
Pin# Defi nition
13 +3.3V
14 -12V (NC)
15 COM
16 PS_ON
17 COM
18 COM
19 COM
20 Res (NC)
21 +5V
22 +5V
23 +5V
24 COM
4-pin
Power Connector
Pin Defi nitions
Pin# Defi nition
1 +12V
2 Ground
3 Ground
4 +12V
5-17
Pin # Defi nition
1 +3.3V
2 +3.3V
3 COM
4 +5V
5 COM
6 +5V
7 COM
8 PWR_OK
9 5VSB
10 +12V
11 +12V
12 +3.3V
12V 8-pin
Power Connector Pin
Defi nitions
Pins Defi nition
1 through 4 Ground
5 through 8 +12V
(Required)
Fan Header
Pin Defi nitions
Pin# Defi nition
1 Ground
2 +12V
3 Tachometer
4 PWR Modulation