Even at 400 hash you get a CPU that pays for itself within 6 months at current prices. Since you need a CPU to mine with your GPUs anyways why not get one that pays for itself, brings in a little profit after that and also has good resale value?
For those that have an 8 core Ryzen and have not been able to reach 600+ hashrate on XMR, you will need to enable large page files (requires Windows Pro). Once I did that I went from ~450-470 to 600-630 hashrate on my R7 1700X @ 4.0 ghz. It's a nice boost in AEON too (the most profitable CPU coin right now).
Hi man, Are you talking about Virtual Memory? if not, how i enable large page files?
Basically you are telling windows that it can use larger pages amounts of physical memory instead of virtual memory, at least that's my understanding of it. You need to assign "lock pages" privileges to the user account that will be mining. Follow the steps here and it should work ---
https://technet.microsoft.com/en-us/library/ms190730(v=sql.105).aspx --- you may need to reboot afterwards and when you start the miner you will need to right click and run as administrator for the changes to take effect.