faster clock = higher load power
Not following what you're saying there. Maybe it's the double negative.
You didn't quote the explanation but it was there.
I asked this question because I don't understand how you came to settle on those two CPUs and because I'm questioning your ability to pick your CPUs yourself.
There's nothing wrong with not understanding the issues involved. Most people don't have the beginning of a clue.
I'll make it simple: if you want "oomph" at that price point, pick a 2500K and a board which supports overclocking (they've become quite affordable).
You can have better "oomph" if you pay a bit more obviously.
The point of the 3450 and the 3450S is that they're among the most efficient x86 CPUs on the planet. But they're don't offer the most "oomph" for the price.
If you give a CPU more "oomph", you make it less efficient. That's the only reason to pick the 3450S: it's got a bit less "oomph" by design, which makes it a tad more efficient.
In case you're wondering, "oomph" only means "phat benchmarks" and not necessarily "something I have a use for".