Chapter 2: Choose Proper Parts For Your System
10 A26361-D1691-Z120-1-7619, Edition 1
2.4 - Power Supply Considerations
● Power connectors
Thunder i7525 S2676 board supports EPS/12V power supply unit (PSU) with three power
connectors listed below.
EPS/12V Power Connectors
+
24-pin system power connector 8-pin CPU power connector
(split CPU power planes)
● Split processor power planes
Thunder i7525 S2676 board supports dual Intel’s 800 MHz FSB Xeon
processors, which
could reach up to 140 Watts per processor. (Check Intel’s web for the processor
specifications.) By following SSI EEB v3.51 specifications, Thunder i7525 S2676 is designed
with two separate voltage regulator circuits to provide the power for both onboard processors
in separate power rail. Using a power supply with a combined CPU power plane from the CPU
power connector is not allowed and may cause the system to fail to power up or damage to the
power supply.
● Power requirements
Check your power supply specifications to ensure sufficient power currents for each power rail
based on your system configuration.
The major system components/parts power sources are listed below as reference:
Components/Parts Main Power Source Power Connectors
CPU1 +12V_CPU1 8-pin CPU power connector
CPU2 +12V_CPU2 8-pin CPU power connector
Memory (Normal) +12V 24-pin and 6-pin power connectors
Memory
(Suspend to RAM)
+5Vstandby 24-pin power connector
System logic +3.3V 24-pin and 6-pin power connectors
X16 PCI-Express
Graphic card
+12V and +3.3V 24-pin and 6-pin power connectors
X8 PCI-Express +12V and +3.3V 24-pin and 6-pin power connectors
32-bit PCI +12V, +5V and +3.3V 24-pin and 6-pin power connectors
Cooling fans +12V 24-pin and 6-pin power connectors
IDE/SATA hard drives +12V and +5V From PSU
CDROM/DVD drives +12V and +5V From PSU
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