Cpu very similar to i3 6100

Solution
You may want to back up a bit. If all you have is RAM, just sell it and get DDR4. If you actually have a current system, you may want to start by listing the specs. Many platforms use DDR3 RAM, you can't just ask for a CPU in the same speed range because it may not fit your motherboard. And if you are going to swap the motherboard, you may as well spend the extra $40 on new RAM and new platform.
You may want to back up a bit. If all you have is RAM, just sell it and get DDR4. If you actually have a current system, you may want to start by listing the specs. Many platforms use DDR3 RAM, you can't just ask for a CPU in the same speed range because it may not fit your motherboard. And if you are going to swap the motherboard, you may as well spend the extra $40 on new RAM and new platform.
 
Solution
On the other hand, DDR4 is the new standard, and probably will be for some time. If you go ahead and make the jump to Skylake and DDR4 now, you will not have to on your next upgrade.
 


Why limit yourself to last generation stuff to save $30-40? Just sell your current parts and use that to purchase the RAM.

The new intel CPUs can use DDR3 but I think every one of those needs DDR3L (low voltage), I don't think standard DDR3 will work, unless some new motherboards have come out recently. Edit -- the mobo in the post a few over mine looks to run on standard DDR3, and at least at the time of the post, it's on sale at a good price for a higher end board.

And you also did not list your current specs or budget or any other details. Asking the right question is key.
 


Ok, slow down, take a deep breath...

All right, now that that's out of the way...

Are you trying to upgrade or replace a current build? If so, is there a particular reason that you don't want the i3-6100...aside from the fact that chips like the i5-2400/2500K (& even the FX-8300 series) can easily keep up with it in the majority of games?

And the follow-on is, what is your current system, & why do you think it needs completely replaced, as opposed to simply being upgraded?
 
There are some skylake motherboards that use DDR3 ram.
Normally, skylake supports only low voltage(1.35v) ddr3 ram.
Typical DDR3 ram is 1.5v which can damage your processor over time.
Some motherboards, and I imagine the more expensive ones say they will support 1.5v ram, but I would be wary.

I3-4170 will perform about the same since you will be using a discrete graphics card.

Still, since you will be buying new parts, I suggest you sell your ddr3 kit in favor of ddr4.
$70 buys you a ddr4 16gb kit, $40 buys you a H110 motherboard, and $125 buys you a I3-6100.
You then have upgrade options to I5 and I7.


 
There has been zero evidence from any testing that shows normal JEDEC approved DDR3 has been harmful to Skylake processors, despite the clickbait claims originated by M. Sexton.

On the other hand, I have been pushing 1.65v in my lab for most of the past year with no harmful effects.

The low voltage rating seems to be a capability rather than a restriction, just as it has been with previous gen products such as Haswell and Ivy.