Don't worry about bandwidth, I'll tell you the comparisons I've seen, real test environment. Those 2133 cost you about 1866. In pcc you also have 1600 with high latencies 7€ cheaper or my 1333 16€ cheaper. If you go for price you buy the Crucial and put them at 1600, if you go for performance get those G.Skill.
Editing: As for the i7, I insist, forget about buses and various theories, don't get too carried away with the memories that are a few euros. What you need to clarify is if you rent the virtual threads because you would pay for them more than 80€. To play in general I already told you no (rare is that a game benefits from HT), better put them in the piggy bank or spend it already on GPU, with a 3570K it's already good. For calculations, design/editing and compression/decompression you'll get a slice of the 8 threads and even for this, if it's casual, an i5 is enough.