Is this a good combo? Do I need 1000 watts

Will it bottleneck?
Yes, but this is a "how long is a piece of string" type question because bottlenecks are inevitable and they depend on the game, the age/type of game and how you plan on playing it (e.g. settings and resolution).

If you tell us exactly what you're planning to do with the PC and what your budget is, we can suggest the best parts for your usage, but spit balling PC parts from what I assume are used PCs will just get you vague answers like "yeah it'll be fine" or "nope, don't buy it".
 
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