Best 32gb (16x2) DDR4 modules?

G.Skill has been my go-to brand for RAM for a long time. Prices are better then a lot of other 'premium' brands and I've never had any issues with them. And you board supports up to DDR4 3400, so I'd get these (only 3200's but all 3400's seem to be sold out atm): https://www.amazon.com/G-SKILL-Ripjaws-PC4-25600-Platform-F4-3200C16D-32GVK/dp/B0171GQR0C/

I don't have an answer, but I have a question. Is there a reason why you want 32GB? That is a lot and most people would not need that much for normal tasks. If you can't use the extra RAM, you will not get more performance and it will be a waste of money, especially since a 6700k is a quad core which means you may want to upgrade the CPU soon for gaming and then you may need to get different RAM.

If you need 32GB for something, then go for it, but if you are just using it for gaming, I am not aware of any game that benefits from over 16GB right now. If you don't need 32GB, why not just get another matching set to the 8GB you have now to make 16GB?

Easy pick for where I live would be https://www.amazon.co.uk/dp/B016ORTNI2?tag=pcp0f-21&linkCode=ogi&th=1&psc=1 but depends on your local prices.

Your boards QVL lists memory ASUS themselves have tested with your board and is an easy way to guarantee compatibility at a certain speed
https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/Z170-K/Z170_DDR4_4DIMM_memory_QVL_report_201712.pdf

Quick maths for DDR performance is to take the headline speed (3200mhz or whatever) and divide it by the headline CL value (usually 14/15/16) and whichever comes out higher runs faster. So 2666/CL13=205 is broadly equivalent to 3200/CL16=200, whereas a 3000/CL14=214 would be marginally better than both. This is true across all brands, the only significant exception being if you're gaming with your integrated graphics (Intel HD 620 or whatever) in which case more speed is always better - but in that case spending on a proper graphics card is a far wiser move.

That said you'll see basically no difference between memory speed/CL combinations if you're running a discrete graphics card, faster memory just eliminates a potential bottleneck (essentially your minimum frame rates improve slightly with faster RAM). If you think that's worth spending on premium memory I salute your wallet but otherwise plumping for whatever is priced best, preferably from a brand you've heard of, would be the way to go for most of us.

GL with it.

with a board that old i would stay the hell away from 2x16gb kits. even with the "newest" bios this is just asking for trouble.

get 4x8gb instead if you feel like you need 32gb total.

also consider that buying a lot of ram fitting for your current and kind of old computer doesn't make much sense. if you have plans to upgrade next year or something just wait until then and buy everything new at the same time.

Hi, thanks for the answerds. I use dedicated graphic card and i still play all games 2k on ultra (death stranding, horizon zero dawn, doom eternal, etc), no point for upgrading the rest of the system in a few years at least (2/+3). The ram is for video editing, multitasking, etc. 8gb is short now. The ram is not a part that expensive anyway.