When video card manufacturers advertise a minimum for a PSU, it's generally what you could get away with on a very low quality unit. Both the 650 ti Boost and the 760 sip power for how powerful they are, so the manufacturers are saying that *any old* PSU labeled 450w or 500w, respectively, would do the job.
Now, the CX430 isn't a very low quality unit. Or a low quality unit. Or even average. It's actually above average, though it should be labeled 400w, in my opinion. That's what it is, a decent quality 400w unit. As such, it can run a 3220, along with a low- or mid-range GPU, and all the other drives/fans etc. you want.