RAM isn't SB only, it's just being marketed for SB, in reality all DDR3 ram works on all mobo's that support DDR3.
Could be PSU issue, never seen that PSU make before. Can also be a RAM issue, though G Skill is generally very good.
Alternatives are poor wiring/insufficient Amperage in the house electrical system, BIOS needs to be flashed to updated version or mobo issue.
Easiest way to eliminate would be:
1. Set RAM to Manf Specs in BIOS.
2. Run memtest86 overnight for at least 8 passes.
3. move system to another outlet on a different circuit in your house/friends house.
4. Swap in a good PSU
5. Flash BIOS. Be aware though if the PC freezes or has issues during a BIOS flash, you're screwed unless mobo has a backup BIOS.
6. Swap mobo.