I build a new rig
i5 4570
Asus z8z-a
Patriot Black Viper 1866 2x4GB
Chieftec BPS 750w c2 PSU (its CWT based PSU) CHIEFTEC | NITRO 85+II
Chif BPS is their top line so don`t say crap PSU it cost 110e here also its CWT production so many other brands use same!
There is a problem at power on, the CPU light on mobo lit red and no post, i need to punch the power on/off few times to make it post, each time it managed to post i get bios error, Overclocking failed, default loaded (but i don`t OC and bios is at default) after that system is 100% stable, next restart again no post 
Tried disabling C6, C7 did not help, also removing extra GPU, PCI cards, just one memory modul all the same
Then i tested PSU with SB 2500K no issue at all! so Chiftec BPS PSU is fine!
Now i am using OLD LC Hyperion 700w PSU with haswell and all working gr8 for past week!
I plan to buy new PSU but i am confused, looks like there is more to it, not just C6/C7 state but also power on problems with some of the PSU and i duno which one to buy?