Why do young people who make videos, such as the one to which Snadge has linked, above, have the need to gabble? :-\
Whoever he was, he might have well been spouting Martian in a Russian accent. Totally impossible to follow (or understand). :-X
Ryzen is compatible with all current DDR4 memory and officially supports upto 3600MHz.
However the sweet spot is 2400-2666MHz, this speed will work with all mainboards including cheaper options.
3000MHz and above will ONLY work at such frequencies in the flagship mainboards like Asus Crosshair for example and even then the maximum stable speed we achieve with a lot of messing around was 3200MHz, which really makes 3000MHz the maximum speed we advise.
Of course you could buy 3200 or even 3600 kit now, and just run it at a lower frequency with more aggressive CAS Timings and as BIOS updates come out then you might be able to achieve higher frequency.
As such we recommend 2400-3000MHz kits for use with Ryzen, faster kits will work just fine but you might have to run them below the rated speed and just set the memory timings more aggressive.
AMDs most affordable Ryzen 7 8-core CPU has been overclocked to 4GHz on all 8 cores. With decent motheboards and cooling this $329 chip is said to be capable of outperforming the flagship $499 Ryzen 7 1800X and Intels $1050 i7 6900K.
OCUK staffer Gibbo reports successfully overclocking a retail Ryzen 7 1700 processor with an ASUS Crosshair VI Hero motherboard to 4.05GHz on all 8 cores. With this overclock the CPU would effectively be running 450MHz higher than the Ryzen 7 1800X flagship, which is very impressive considering the huge price delta between the two chips as well as the low 65W TDP of the 1700. Gibbo estimates, based on his results, that the 1800X should be able to hit 4.3GHz on all 8 cores.
Intel Core i7-6950X $300 Price Cut
Intel Core i7-6900K $200 Price Cut
Intel Core i7-6850K $150 Price Cut
Intel Core i7-6800K $140 Price Cut
Intel Core i7-5820K $100 Price Cut
Intel Core i7-7700K $80 Price Cut
Intel Core i7-6700K $140 Price Cut
Intel Core i7-4790K $90 Price Cut
Intel Core i7-7700 $50 Price Cut
Intel Core i7-6700 $90 Price Cut
Intel Core i5-7600K $70 Price Cut
Intel Core i5-6600K $$90 Price Cut
Intel Core i5-4690K $70 Price Cut
Intel Core i5-7500 $30 Price Cut
Intel Core i5-6500 $50 Price Cut
Intel Core i5-4590 $60 Price Cut
Intel Core i3-7350K $20 Price Cut
Intel Core i3-7100 $15 Price Cut
Intel Core i3-6100 $20 Price Cut
Intel G4400 $20 Price Cut
Intel G3258 $27 Price Cut