Xilinx SP605 Hardware User's Manual page 56

Chapter 1: SP605 Evaluation Board
however, users are cautioned not to also connect a PC ATX type 4-pin power connector to
J27.
56
Caution!
DO NOT plug a PC ATX power supply 6-pin connector into SP605 connector J18.The
ATX 6-pin connector has a different pinout than SP605 J18, and connecting the ATX 6-pin
connector will damage the SP605 and void the board warranty.
Caution!
DO NOT apply power to 6-pin Mini-Fit type connector J18 and 4-pin ATX disk drive
type connector J27 at the same time as this will damage the SP605 board. Refer to
for details. The SP605 Power can be turned on or off through the board mounted slide switch
SW2. When the switch is in the on position, a green LED (DS14) is illuminated.
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Figure 1-20
SP605 Hardware User Guide
UG526 (v1.9) February 14, 2019