budget i3 with z motherboard or i5 with b motherboard

Solution
Skylake benefits from very highly clocked RAM, and you can only use higher than 2133 with a Z170 board. However, an i5 has 4 real cores, vs 2, so it really depends on what you're doing.
I'm not a big fan of non-K overclocking, so my vote is for the i5, though it depends on the i5. An i5 6400 has pretty low clocks, whereas a 6500 turbos only 100mhz lower than the i3 - unnoticeably slower per core, and with twice as many cores.
 

Ari3l

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^^He's not a fan. I am tho. For a really good indepth look at the 6100+z170 board+ higher clocked ram watch this video, it's worth your time and might make you rethink some things : https://www.youtube.com/watch?v=3G-7bfPG2dE

If you fully understand the advantages you can go for a better mobo and higher speed ram as it will help in CPU bound scenarios with the i3 and then when you have more money you can get an i5/i7 and you'll be ready for what those have to offer.
 

Ari3l

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That's pretty obvious for him, i'd hope atleast..

The cool thing with the i3 is that if you're on a tight budget and you add faster clocked ram and OC the CPU and you can pretty much get better performance than a 2500k and then you can sell the i3 and get an i5/i7 and then enjoy your already really fast RAM and OC'ing capabilities with a nice mobo. To me that's more worth it than getting an i5 and getting a cheap mobo that forces you to use slower ram.

But of course, if the money isn't the problem the i5/7 is the obvious choice.