Going to RMA and upgrade to what?

I'd highly recommend EVGA Supernova, build quality is absolutely insane and they're literally silent. Best I've encountered.
 
Personally, I'd go with any of the EVGA G2 or G3 Supernova PSUs, unless the P2/T2 is cheaper (i.e. on offer). That said, Corsair still make some excellent PSUs and if you're happy to stay with them, these would be fine:
https://www.overclockers.co.uk/cors...lar-power-supply-cp-9020083-uk-ca-203-cs.html
https://www.overclockers.co.uk/cors...lar-power-supply-cp-9020073-uk-ca-182-cs.html (is this what you had already?)
https://www.overclockers.co.uk/cors...lar-power-supply-cp-9020044-uk-ca-107-cs.html
https://www.overclockers.co.uk/cors...lar-power-supply-cp-9020094-uk-ca-211-cs.html

You shouldn't really be needing anything greater than your existing PSU, as an OC'd 5930K and Titan XP is well within 850W. I can't see the 8700K using more power than the 5930K, unless the die shrink has resulted in greater power consumption.
 
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