I’d say pick the 2673v4, 2699v4 or one of the top , 2673v4 is the second top processor in the v4 gen I’ve it in my r630 and im very happy with it , changing later will cost you and if you’re not happy with the performance will lose more money since changing processor not easy like ram or diskette Tbh I’m not concerned about power consumption at all so I don’t have something to say about that