It is somewhere around 180W TDP mark, so when we include the rest of the rig it is actually fine. The new CPU, though, will change that equation. Pentium almost doesn't need any power, but an i7... that would increase the draw by at least 60W more in practice. PSU upgrade would be required in such case. This particular PSU is fine, but nothing spectacular, and with only 3 years of warranty doesn't really look like a durable long-term unit.
IMO, any upgrade except i7 is not worth it. i3 is the same as Pentium G, i5 is marginally faster than i3 but still has only 4 threads overall and lacks power in most recent titles (BF1 and BF5 will eat i5s alive). It is basically "go big or go home" situation.