Jay Stew :
Why would you only OC the FX to 4.5? LOL.
Because for a higher oc, you'll need a 990fx board and a very good cpu cooler that easily get you to more than $100 extra expense compared to leaving it at stock.
Actually, you just seem to be trying to justify your decision of going with the fx to yourself. Nothing wrong with the fx series, but the very limited count of scenarios in which it's a price/performance senseful choice isn't going to matter to a usual customer. All the scenarios you have described except for video rendering perform better on the i5, no matter how high you might oc your fx. With the exception of getting it to 7.2+ghz to compensate for the enormous difference in single core performance.
Your argument of i3 overclocked vs Fx-E is absolutely bullshit, too, as there are no overclockable i3's. I have not actually found any benchmark showing an i3 beating a fx in continuous, well distributed workloads either, though, unless Intel Quick Sync has been used, in which case the i3 might very well be 10x faster than the fx.
Not sure where your magical 5 fps difference come from either, the benchmarks I've seen on average show a fps difference of about 20-30%. Meanwhile the i5 does also seem to win most cpu benchmarks by a fairly large margin.
http://www.anandtech.com/show/8227/devils-canyon-review-intel-core-i7-4790k-and-i5-4690k/3
http://www.anandtech.com/show/8227/devils-canyon-review-intel-core-i7-4790k-and-i5-4690k/5
And before you tell me that benchmark is focused on devils canyon processors, I advise you to actually take a look at the i5 4690 featured in the benchmarks.
Jay Stew :
If you want just about all of the same performance, i.e. similar performance, and more flexibility and versatility then pick up an FX for less coin.
Except, for 90% of all tasks and maybe 99% of what's usually performed, you get less performance for more or the same money.
Jay Stew :
Clearly a dual core is not going to beat an oct core at any serious computing.
Oh come on, it's 2015. You must be trolling, comparing core to core with absolutely different architectures. One i3 core is actually superior to TWO fx cores.