OP you are a troll, but i will give you a few minutes of my time with the hope that you are redeemable. I am exactly what you are looking for , i used a Celeron G540 at 2.5ghz and i upgraded to an Ivy i3 3220.
Edit: when i talk about percentages in the next paragraphs, i talk when the performance is CPU limited. I know because i check with msi afterburner and i both downclock or overclock the gpu or increase/decrease msaa with no change in fps.
In games that use up to 2 cores like X3 albion prelude, Crysis 1, i got a 40% fps improvement in a CPU bottleneck scenes, which is expected. A 3.3ghz i3 ivy is equivalent to a 3.5ghz sandy celery, as the extra 1mb of cache and IPC improvement is less than a 10% boost at the same clocks, in single threaded workloads.
On games that use more than 2 threads, like Skyrim, Test drive unlimited 2, i got an average of 50% fps improvement when the bottleneck was the CPU.
On encoding with handbrake i get around 75% improvement in encoding time. Averaging everything i use the computer for, the increase in performance is at best 50%, as i am generous with that number because the increase in performance in games is visible only when the CPU was bottlenecking.
Also where i live a celery is almost 3 times as cheap as an ivy i3. Also i was getting good performance in games with my celery, for example the lowest in skyrim and tdu 2 was 30 fps. Now in those games with the ivy i3 the minimum i get is 45.
Like i said, those situations of boos in fps in games were only when the games were cpu limites. For example in skyrim, in the situations where the bottleneck was on the CPU, the fps increased by 50%, but overall, the average fps, is half that, maybe around 25% more fps.
So i paid over 2.5 times than what a celery costs, to get a 25% average increase in fps in games. For its performance and price and power consumption (which i was able to undervolt a lot too), a celery is a great deal. If my post did not prove you wrong, i don't know what will.