What to watch out for when running two instances of Hashcat at once?

[Coloradohusky]

What is the significance of this? Just do multiple cmds in a bat file. 

hashcat.exe -m xxx -w 3 -a 3 etc...
hashcat.exe -m xxx -w 3 -a 0 etc...
pause

If you do 2 instances, you're just going to be splitting the workload and straining your system. So why not just finish one attack and get full potential out of both of them.

I was just wondering if running two Hashcats would mess up the files or anything, since they share files and use them at the same time(ie hashcat.restore, hashcat.potfile), I know that I can change the restore and potfile names but I was asking on here in case there's anything else I need to keep in mind