What is the difference between X11 and X15 ?

[iam2good]

  Hello,

    Please What is the difference between X11 and X15 hashing Algorithm ?

[1714888786]

1714888786

[Rockie1234]

Are you sure you are talking about the right algorithm. X11 is a hashing algorithm, and one of the benefits is that CPUs (good ones!) can perform as well as GPUs. It also means that there are no ASICS for the X11 algorithm, making the distribution process easier. It was developed by Dash, although coins do use it. There are also problems, like the risk of botnet attacks in the future. 

X15 doesn't exist, please explain what you mean.

[xhomerx10]

Actually X15 does exist. 
X11 is a chained hashing algorithm made up of of 11 different algos (groestl, blake, keccak...hell if I remember them all)
X13 builds on this by adding 2 more - fugue and something
X14 builds on this even further by adding another algo - (I forget the name)
X15 adds one more algo - whirlpool

Here's an X15 coin - https://bitcointalk.org/index.php?topic=971382.0

There's even an X17 which (follow along) adds two more algos (which of course I forget)

[joblo]

Good grief. That has to be one of the most misinformed posts I've ever seen. It's 100% incorrect.

I won't repeat what xhimerx said, he is correct. CPU mining these
algos has been dead on a CPUs for a couple of years and GPUs for a year, since the ASICs were released. Only X17
is not supported by ASICs.

The bottom line is, whatever device you mine with, you have to use the correct algo for the coin or your shares will
be rejected.