King_Baguette :
OnkelCannabia :
Since you haven't mention anything, I'm going to assume this is mostly for gaming.
I recently saw some DDR4 benchmarks with CPU bound games. I wish I could still find the link. The conclusion was that memory speed can matter a lot depending on the game. Especially ARMA and Fallout 4 depend a lot on RAM speed. I think it was something like a 10-20% gain between 2000+ and 3000+ mhz. On some games it barely matters at all.
If you have a big budget and want to get the most out of your 7700k, I'd go for over 3000. Slightly over 3000 will still get you good value for money, up to 3600 will be expensive but still somewhat decent value. Above that value per money gets pretty terrible.
If you are more on a budget, I'd start with 2133 and go up step by step until the prices increase steeply. Anything under 2000mhz will probably be fine now, but will be bad future proofing. I have an i5-2500k with 1333mhz (gonna upgrade this month probably) and more and more games are popping up where I'm heavily underperforming because of my RAM speed.
Thanks a lot for the answer!
Yes it will mainly be for gaming, but also a little bit of editing.
I'm only missing one point.
On the intel site it states which memory types are compatible with the processor. And the same with the motherboard.
Can I still buy 3000+ mhz? If possible I'll probably take one with 3200mhz.
EDIT:
Processor:
http://prnt.sc/dsoft8
MOBO:
http://prnt.sc/dsohhx
Check
this thread out. Basically the CPU speeds are very conservative projections.
Here is a quote from extremetech
All of our CPUs were configured with four 8GB sticks of DDR4-3200 courtesy of GSkill (F4-3200C14Q-32GTZ). We had no trouble running the RAM at 3200MHz with Skylake, Kaby Lake, or Broadwell-EP, even though the maximum clock speed was substantially higher than anything these chips are formally rated for.
I believe I saw some benchmarks even going up to 4000, but that might not have been Kaby Lake. As for making sure your RAM runs at full speed, I believe XMP should do it for you. You might have to activate XMP in the BIOS though. Basically XMP is a standard that overclocks your RAM beyond the JEDEC standard given by your CPU. Not sure if my explanations are 100% accurate, as I'm not too familiar with this subject, but the gist of it is, yes you can go significantly above the speed specified by your CPU.
EDIT: And keep in mind that the performance benefit is only for CPU bound games/settings. It's hard to tell how many games will depend on it in the future. Games like ARMA and Fallout 4 where RAM speed can matter a lot are outliers. It's nice to have fast, future proof RAM for these situations, but as long as you stay over 2000, I don't think you will have any serious bottleneck for a very, very long time. But that is just my opinion... I can't tell the future.
Edit 2: Found it
here And
here
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