You only have One EPS 8-Pin 4x4 and you Do need the Second 4-Pin.
You may want to rethink the PSU you are going with, a 750 Gold would have been best if using a AMD Ryzen 7 CPU
Where did you Hear "I hear that the 4 pin is optional anyways, so can I just plug in the 8 pin?" this?
Need More Hardware Info like Make and Model Numbers.
This Question might be best asked on the AUSU Support as well, at least they should know this being their MB that is.
2 x RGB Header(s)
1 x USB 3.1 Gen 1 connector(s) support(s) additional 2 USB 3.1 Gen 1 port(s)
1 x USB 2.0 connector(s) support(s) additional 2 USB 2.0 port(s)
1 x M.2 Socket 3 with M key, type 2242/2260/2280/22110 storage devices support
1 x TPM header
8 x SATA 6Gb/s connector(s)
1 x CPU Fan connector(s)
1 x CPU OPT Fan connector(s)
3 x Chassis Fan connector(s)
1 x W_PUMP+ connector
1 x AIO_PUMP connector 1 x 8-pin EATX 12 V Power connector1 x 4-pin EATX 12 V_1 Power connector(s)
1 x 24-pin EATX Power connector(s)
1 x Front panel audio connector(s) (AAFP)
1 x Slow Mode switch(es)
1 x Thermal sensor connector(s)
1 x Reset button(s)
1 x LN2 Mode jumper(s)
1 x ROG extension (ROG_EXT) header(s)
1 x Safe Boot button
1 x ReTry button
1 x System panel connector
2 x 3D Mount screw port(s)
1 x W_IN header
1 x W_OUT header
1 x W_FLOW header
1 x Start button
1 x USB 3.1 Gen 2 front panel connector
post edited by bcavnaugh - 2017/07/17 11:14:11