I have this Corsair AX760 psu,which is very similar,if not exactly the same psu.
Used it for about 2,5 years,with my Sapphire r9 290x.
Started experiencing lately some crashes,in-game,or when alt-tabbing(BSOD).
Tryied my video card in 2 other pc's,card works perfectly.
I thought why shouldn't i change my pcix cable from psu to other port,when i saw that the psu end cable(pcix) has 3 melted pins.
Never occured in my mind,that this could happen to a high-end psu.
Changed the cable and the port on the psu,but the crashes kept coming back,sadly.Changed the gpu from slot 1 to slot 2,same crashes.Changed the motherboard,to test,same crashes.
Memtest was ok.
Opened a ticket at corsair,for psu,still waiting,no reply.
My connections were ok,double checked every time,when assembling.