No such thing as a cpu only coin some one else will always find a way to mine gpu. if not they still got botnets out there
botnets are largely CPU based. Primecoin is an example of a true CPU coin. There's a GPU miner but it's very inefficient because GPUs just aren't good at prime chains, it's complex math that pretty much requires a complex core, not a bunch of little simple math GPU cores.
PS: Still trolling I see, eh number37?