azaran :
Unfortunately Be Quiet doesn't like listing it's RAM clearance, because why make things easy for your customers. But from what I could see online, the Be Quiet Pure Rock "should" be able to support Corsair Vengeance LED which has a height of 49mm. So you'd probably be safe running anything under that. Both the TridentZ RGB (44mm) and the HyperX Fury (34-35mm) should fit in just fine. I would also look at the Cryorig line of coolers. They're on par with the Be Quiet models (if not better) but they don't have any RAM clearance issues.
As for the info from your sysadmin, he may be right. The problem is since the H370 boards haven't come out yet, we don't know what the max supported speed is going to be. I've seen pieces on rumors that it'll only support 2666Mhz, some with rumors that they're support up to 3200mhz/3600Mhz, and some saying they won't lock the multiplier at all. So until you know exactly what it supports, you wont know what your buying range is. Now you can always just throw the dice and get a higher speed model. If it higher speed isn't supported the board will just run it at it's own max speed, so you wont have RAM laying around you can't use. It'll just run slower than it's labeled as being able to run. Sometimes that's good if there's a sale where 3200Mhz is somehow cheaper than 2400Mhz. RAM prices get weird sometimes and I've seen that happen a lot in the last year. It's why buying ahead of time, especially if the board hasn't even hit the market yet, can be risky. But a sale is a sale and I get that. I would say it's likely they'll at least support 2666Mhz sticks, so looking at sales on those sticks might be a good idea. Also you can try looking at the QVL listings for the H270 equivalent boards to see what brands and models make that list. It's likely the H370 QVL will be a modified version, and you can use that to narrow down the choices for prepurchases. Just keep the RAM height to under 49mm and you should be alright.
As for if CL15 ram at 2400Mhz performing as well as CL16 at 2666mhz, there's a pretty simple equation you can use to find out:
(CL/Data Rate)*1000=speed in nanoseconds
So CL15 at 2400mhz is (15/2400)*1000 = 6.25 nanoseconds, CL16 at 2666mhz is (16/2666)*1000= 6 nanoseconds.
So even at a slower CL, the 2666 stuff is .25ns faster than the tighter 15CL 2400Mhz stuff. Now if you'll ever notice the .25ns difference... well that's debatable. If the hardware/software you're using can really leverage that difference (say 3D rendering) then yeah it may be worth the price difference. If they can't then you'll never see the difference and you'll have basically spent money on bragging rights. Personally I'd rather spend the difference in cash on components that can make a difference in things like better GPU, better monitor, larger capacity SSD, and so on. But everyone has different needs for their builds and to some the extra money on LEDs is worth more than a higher capacity SSD. To each their own and only you can decide where the importance lies for your build.
Very extensive info and details once again! Many thanks, azaran!
Regarding the CPU cooler - it's already been purchased, actually. I was aware of Cryorig at the time but unfortunately they're not available at my home country and at the time I didn't have the means of importing components from the US by myself. Hopefully, I won't be regretting my Be Quiet Purchase, though.
I have decided to disregard my sysadmin's recommendation and will be going for one of the 2400 MHz / CL 15 kits, still split between the TridentZ RGB and the HyperX Fury, though. I think I'll toss a coin and make the choice based on heads or tails.
😀
On another note, I actually came across several Z370s on newegg, which are within my budget. I'm wondering whether or not to pull the trigger on one of them right now. Does it matter that I have an 8400 and don't plan to do any overclocking? Let's say my budget for the MB is $150, do you think it's better to get a Z370 for that price at the moment, or do you reckon that there would be H370s with more relevant specs for my needs at this price point down the line?