Can i run a GTX 760 and GTX 970 on a 760 watt psu ?

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Yes, they have to be the same gpu (gtx 970 with gtx 970 and so on). You can however have a gtx 970 as your primary gpu and the gtx 760 as a dedicated physics gpu (for games that use this feature), but you have to specially configure them for this. P.S. I wouldn't do this in your place. If you need/want a gpu upgrade than buy the gtx 970 and sell your gtx 760 to get some money back. I would not recommend a gtx 760 sli at this time. Better to get a gtx 970, and sell the gtx 760.
Yes, they have to be the same gpu (gtx 970 with gtx 970 and so on). You can however have a gtx 970 as your primary gpu and the gtx 760 as a dedicated physics gpu (for games that use this feature), but you have to specially configure them for this. P.S. I wouldn't do this in your place. If you need/want a gpu upgrade than buy the gtx 970 and sell your gtx 760 to get some money back. I would not recommend a gtx 760 sli at this time. Better to get a gtx 970, and sell the gtx 760.
 
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