That's not the model. That's the voltage range it can operate in. I'm guessing you probably have the S12III, which despite being a Seasonic power supply is not a very good unit overall. Especially compared to OTHER Seasonic power supplies from series that are high quality. It's definitely not the worst power supply you could have, but it's not "Seasonic" quality either as it's outsourced to a 3rd party manufacturer that is a bit further down the OEM food chain.
I would contact G.Skill support. I'm betting you have a faulty memory kit and one of the sticks doesn't want to play nice with the other one.
Try this. Power off. Remove the DIMM in the 4th slot, leaving only the DIMM in the 2nd slot over from the CPU. Do a CMOS reset as follows and then with only the one DIMM installed see if you are able to run the one stick of memory at the XMP profile speed.
If it does not work, shut back down and swap the sticks out and try again with the other stick of memory.
BIOS Hard Reset procedure
Power off the unit, switch the PSU off and unplug the PSU cord from either the wall or the power supply.
Remove the motherboard CMOS battery for about three to five minutes. In some cases it may be necessary to remove the graphics card to access the CMOS battery.
During that five minutes while the CMOS battery is out of the motherboard, press the power button on the case, continuously, for 15-30 seconds, in order to deplete any residual charge that might be present in the CMOS circuit. After the five minutes is up, reinstall the CMOS battery making sure to insert it with the correct side up just as it came out.
If you had to remove the graphics card you can now reinstall it, but remember to reconnect your power cables if there were any attached to it as well as your display cable.
Now, plug the power supply cable back in, switch the PSU back on and power up the system. It should display the POST screen and the options to enter CMOS/BIOS setup. Enter the bios setup program and reconfigure the boot settings for either the Windows boot manager or for legacy systems, the drive your OS is installed on if necessary.
Save settings and exit. If the system will POST and boot then you can move forward from there including going back into the bios and configuring any other custom settings you may need to configure such as Memory XMP, A-XMP or D.O.C.P profile settings, custom fan profile settings or other specific settings you may have previously had configured that were wiped out by resetting the CMOS.
In some cases it may be necessary when you go into the BIOS after a reset, to load the Optimal default or Default values and then save settings, to actually get the hardware tables to reset in the boot manager.
It is probably also worth mentioning that for anything that might require an attempt to DO a hard reset in the first place, IF the problem is related to a lack of video signal, it is a GOOD IDEA to try a different type of display as many systems will not work properly for some reason with displayport configurations. It is worth trying HDMI if you are having no display or lack of visual ability to enter the BIOS, or no signal messages.
Trying a different monitor as well, if possible, is also a good idea if there is a lack of display. It happens.
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