choosing xeon cpu for webhosting stack

I'm planning to buy 2 new servers in order to create a HA cluster for a production enviroment featuring lamp stack through proxmox.

i'm between del r340 and dell r540 the first is feraturing an 8c16t e-2288g and the later an 8x16t silver 4215 after googling around i found out that the single thread performance(which as i understand is what i'm looking for in a webserver/sql/php application) of the e-2288g is significantly faster than the 4215. what i don't understand is how the second maching is much more expensive than the first when the first processor is much faster than the second whicle at the same time both of them have 8 cores and 16 threads.

/me scratches head.

Intel's market segmentation diluting its Xeon brand, mostly. The E-2288G is code name Coffee Lake, positioned alongside the Core series for some reason. Silver 4215 is a 2nd gen Xenon Scalable Processor, code name Cascade Lake.

Read the fine print on the memory supported, caches, integrated graphics, and other features. In particular, that E series is limited to 128 GB RAM.

If you cannot decide, get both, performance test both, and return one.

Yes, this is confusing. No one likes needing to make a table to make sense out of CPU models.